drivers/gpu/drm/exynos/exynos_drm_dsi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Samsung SoC MIPI DSI Master driver.
   4  *
   5  * Copyright (c) 2014 Samsung Electronics Co., Ltd
   6  *
   7  * Contacts: Tomasz Figa <[email protected]>
   8 */
   9
  10 #include <linux/clk.h>
  11 #include <linux/delay.h>
  12 #include <linux/component.h>
  13 #include <linux/gpio/consumer.h>
  14 #include <linux/irq.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_gpio.h>
  17 #include <linux/of_graph.h>
  18 #include <linux/phy/phy.h>
  19 #include <linux/regulator/consumer.h>
  20
  21 #include <asm/unaligned.h>
  22
  23 #include <video/mipi_display.h>
  24 #include <video/videomode.h>
  25
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/drm_bridge.h>
  28 #include <drm/drm_fb_helper.h>
  29 #include <drm/drm_mipi_dsi.h>
  30 #include <drm/drm_panel.h>
  31 #include <drm/drm_print.h>
  32 #include <drm/drm_probe_helper.h>
  33 #include <drm/drm_simple_kms_helper.h>
  34
  35 #include "exynos_drm_crtc.h"
  36 #include "exynos_drm_drv.h"
  37
  38 /* returns true iff both arguments logically differs */
  39 #define NEQV(a, b) (!(a) ^ !(b))
  40
  41 /* DSIM_STATUS */
  42 #define DSIM_STOP_STATE_DAT(x)          (((x) & 0xf) << 0)
  43 #define DSIM_STOP_STATE_CLK             (1 << 8)
  44 #define DSIM_TX_READY_HS_CLK            (1 << 10)
  45 #define DSIM_PLL_STABLE                 (1 << 31)
  46
  47 /* DSIM_SWRST */
  48 #define DSIM_FUNCRST                    (1 << 16)
  49 #define DSIM_SWRST                      (1 << 0)
  50
  51 /* DSIM_TIMEOUT */
  52 #define DSIM_LPDR_TIMEOUT(x)            ((x) << 0)
  53 #define DSIM_BTA_TIMEOUT(x)             ((x) << 16)
  54
  55 /* DSIM_CLKCTRL */
  56 #define DSIM_ESC_PRESCALER(x)           (((x) & 0xffff) << 0)
  57 #define DSIM_ESC_PRESCALER_MASK         (0xffff << 0)
  58 #define DSIM_LANE_ESC_CLK_EN_CLK        (1 << 19)
  59 #define DSIM_LANE_ESC_CLK_EN_DATA(x)    (((x) & 0xf) << 20)
  60 #define DSIM_LANE_ESC_CLK_EN_DATA_MASK  (0xf << 20)
  61 #define DSIM_BYTE_CLKEN                 (1 << 24)
  62 #define DSIM_BYTE_CLK_SRC(x)            (((x) & 0x3) << 25)
  63 #define DSIM_BYTE_CLK_SRC_MASK          (0x3 << 25)
  64 #define DSIM_PLL_BYPASS                 (1 << 27)
  65 #define DSIM_ESC_CLKEN                  (1 << 28)
  66 #define DSIM_TX_REQUEST_HSCLK           (1 << 31)
  67
  68 /* DSIM_CONFIG */
  69 #define DSIM_LANE_EN_CLK                (1 << 0)
  70 #define DSIM_LANE_EN(x)                 (((x) & 0xf) << 1)
  71 #define DSIM_NUM_OF_DATA_LANE(x)        (((x) & 0x3) << 5)
  72 #define DSIM_SUB_PIX_FORMAT(x)          (((x) & 0x7) << 8)
  73 #define DSIM_MAIN_PIX_FORMAT_MASK       (0x7 << 12)
  74 #define DSIM_MAIN_PIX_FORMAT_RGB888     (0x7 << 12)
  75 #define DSIM_MAIN_PIX_FORMAT_RGB666     (0x6 << 12)
  76 #define DSIM_MAIN_PIX_FORMAT_RGB666_P   (0x5 << 12)
  77 #define DSIM_MAIN_PIX_FORMAT_RGB565     (0x4 << 12)
  78 #define DSIM_SUB_VC                     (((x) & 0x3) << 16)
  79 #define DSIM_MAIN_VC                    (((x) & 0x3) << 18)
  80 #define DSIM_HSA_MODE                   (1 << 20)
  81 #define DSIM_HBP_MODE                   (1 << 21)
  82 #define DSIM_HFP_MODE                   (1 << 22)
  83 #define DSIM_HSE_MODE                   (1 << 23)
  84 #define DSIM_AUTO_MODE                  (1 << 24)
  85 #define DSIM_VIDEO_MODE                 (1 << 25)
  86 #define DSIM_BURST_MODE                 (1 << 26)
  87 #define DSIM_SYNC_INFORM                (1 << 27)
  88 #define DSIM_EOT_DISABLE                (1 << 28)
  89 #define DSIM_MFLUSH_VS                  (1 << 29)
  90 /* This flag is valid only for exynos3250/3472/5260/5430 */
  91 #define DSIM_CLKLANE_STOP               (1 << 30)
  92
  93 /* DSIM_ESCMODE */
  94 #define DSIM_TX_TRIGGER_RST             (1 << 4)
  95 #define DSIM_TX_LPDT_LP                 (1 << 6)
  96 #define DSIM_CMD_LPDT_LP                (1 << 7)
  97 #define DSIM_FORCE_BTA                  (1 << 16)
  98 #define DSIM_FORCE_STOP_STATE           (1 << 20)
  99 #define DSIM_STOP_STATE_CNT(x)          (((x) & 0x7ff) << 21)
 100 #define DSIM_STOP_STATE_CNT_MASK        (0x7ff << 21)
 101
 102 /* DSIM_MDRESOL */
 103 #define DSIM_MAIN_STAND_BY              (1 << 31)
 104 #define DSIM_MAIN_VRESOL(x, num_bits)   (((x) & ((1 << (num_bits)) - 1)) << 16)
 105 #define DSIM_MAIN_HRESOL(x, num_bits)   (((x) & ((1 << (num_bits)) - 1)) << 0)
 106
 107 /* DSIM_MVPORCH */
 108 #define DSIM_CMD_ALLOW(x)               ((x) << 28)
 109 #define DSIM_STABLE_VFP(x)              ((x) << 16)
 110 #define DSIM_MAIN_VBP(x)                ((x) << 0)
 111 #define DSIM_CMD_ALLOW_MASK             (0xf << 28)
 112 #define DSIM_STABLE_VFP_MASK            (0x7ff << 16)
 113 #define DSIM_MAIN_VBP_MASK              (0x7ff << 0)
 114
 115 /* DSIM_MHPORCH */
 116 #define DSIM_MAIN_HFP(x)                ((x) << 16)
 117 #define DSIM_MAIN_HBP(x)                ((x) << 0)
 118 #define DSIM_MAIN_HFP_MASK              ((0xffff) << 16)
 119 #define DSIM_MAIN_HBP_MASK              ((0xffff) << 0)
 120
 121 /* DSIM_MSYNC */
 122 #define DSIM_MAIN_VSA(x)                ((x) << 22)
 123 #define DSIM_MAIN_HSA(x)                ((x) << 0)
 124 #define DSIM_MAIN_VSA_MASK              ((0x3ff) << 22)
 125 #define DSIM_MAIN_HSA_MASK              ((0xffff) << 0)
 126
 127 /* DSIM_SDRESOL */
 128 #define DSIM_SUB_STANDY(x)              ((x) << 31)
 129 #define DSIM_SUB_VRESOL(x)              ((x) << 16)
 130 #define DSIM_SUB_HRESOL(x)              ((x) << 0)
 131 #define DSIM_SUB_STANDY_MASK            ((0x1) << 31)
 132 #define DSIM_SUB_VRESOL_MASK            ((0x7ff) << 16)
 133 #define DSIM_SUB_HRESOL_MASK            ((0x7ff) << 0)
 134
 135 /* DSIM_INTSRC */
 136 #define DSIM_INT_PLL_STABLE             (1 << 31)
 137 #define DSIM_INT_SW_RST_RELEASE         (1 << 30)
 138 #define DSIM_INT_SFR_FIFO_EMPTY         (1 << 29)
 139 #define DSIM_INT_SFR_HDR_FIFO_EMPTY     (1 << 28)
 140 #define DSIM_INT_BTA                    (1 << 25)
 141 #define DSIM_INT_FRAME_DONE             (1 << 24)
 142 #define DSIM_INT_RX_TIMEOUT             (1 << 21)
 143 #define DSIM_INT_BTA_TIMEOUT            (1 << 20)
 144 #define DSIM_INT_RX_DONE                (1 << 18)
 145 #define DSIM_INT_RX_TE                  (1 << 17)
 146 #define DSIM_INT_RX_ACK                 (1 << 16)
 147 #define DSIM_INT_RX_ECC_ERR             (1 << 15)
 148 #define DSIM_INT_RX_CRC_ERR             (1 << 14)
 149
 150 /* DSIM_FIFOCTRL */
 151 #define DSIM_RX_DATA_FULL               (1 << 25)
 152 #define DSIM_RX_DATA_EMPTY              (1 << 24)
 153 #define DSIM_SFR_HEADER_FULL            (1 << 23)
 154 #define DSIM_SFR_HEADER_EMPTY           (1 << 22)
 155 #define DSIM_SFR_PAYLOAD_FULL           (1 << 21)
 156 #define DSIM_SFR_PAYLOAD_EMPTY          (1 << 20)
 157 #define DSIM_I80_HEADER_FULL            (1 << 19)
 158 #define DSIM_I80_HEADER_EMPTY           (1 << 18)
 159 #define DSIM_I80_PAYLOAD_FULL           (1 << 17)
 160 #define DSIM_I80_PAYLOAD_EMPTY          (1 << 16)
 161 #define DSIM_SD_HEADER_FULL             (1 << 15)
 162 #define DSIM_SD_HEADER_EMPTY            (1 << 14)
 163 #define DSIM_SD_PAYLOAD_FULL            (1 << 13)
 164 #define DSIM_SD_PAYLOAD_EMPTY           (1 << 12)
 165 #define DSIM_MD_HEADER_FULL             (1 << 11)
 166 #define DSIM_MD_HEADER_EMPTY            (1 << 10)
 167 #define DSIM_MD_PAYLOAD_FULL            (1 << 9)
 168 #define DSIM_MD_PAYLOAD_EMPTY           (1 << 8)
 169 #define DSIM_RX_FIFO                    (1 << 4)
 170 #define DSIM_SFR_FIFO                   (1 << 3)
 171 #define DSIM_I80_FIFO                   (1 << 2)
 172 #define DSIM_SD_FIFO                    (1 << 1)
 173 #define DSIM_MD_FIFO                    (1 << 0)
 174
 175 /* DSIM_PHYACCHR */
 176 #define DSIM_AFC_EN                     (1 << 14)
 177 #define DSIM_AFC_CTL(x)                 (((x) & 0x7) << 5)
 178
 179 /* DSIM_PLLCTRL */
 180 #define DSIM_FREQ_BAND(x)               ((x) << 24)
 181 #define DSIM_PLL_EN                     (1 << 23)
 182 #define DSIM_PLL_P(x)                   ((x) << 13)
 183 #define DSIM_PLL_M(x)                   ((x) << 4)
 184 #define DSIM_PLL_S(x)                   ((x) << 1)
 185
 186 /* DSIM_PHYCTRL */
 187 #define DSIM_PHYCTRL_ULPS_EXIT(x)       (((x) & 0x1ff) << 0)
 188 #define DSIM_PHYCTRL_B_DPHYCTL_VREG_LP  (1 << 30)
 189 #define DSIM_PHYCTRL_B_DPHYCTL_SLEW_UP  (1 << 14)
 190
 191 /* DSIM_PHYTIMING */
 192 #define DSIM_PHYTIMING_LPX(x)           ((x) << 8)
 193 #define DSIM_PHYTIMING_HS_EXIT(x)       ((x) << 0)
 194
 195 /* DSIM_PHYTIMING1 */
 196 #define DSIM_PHYTIMING1_CLK_PREPARE(x)  ((x) << 24)
 197 #define DSIM_PHYTIMING1_CLK_ZERO(x)     ((x) << 16)
 198 #define DSIM_PHYTIMING1_CLK_POST(x)     ((x) << 8)
 199 #define DSIM_PHYTIMING1_CLK_TRAIL(x)    ((x) << 0)
 200
 201 /* DSIM_PHYTIMING2 */
 202 #define DSIM_PHYTIMING2_HS_PREPARE(x)   ((x) << 16)
 203 #define DSIM_PHYTIMING2_HS_ZERO(x)      ((x) << 8)
 204 #define DSIM_PHYTIMING2_HS_TRAIL(x)     ((x) << 0)
 205
 206 #define DSI_MAX_BUS_WIDTH               4
 207 #define DSI_NUM_VIRTUAL_CHANNELS        4
 208 #define DSI_TX_FIFO_SIZE                2048
 209 #define DSI_RX_FIFO_SIZE                256
 210 #define DSI_XFER_TIMEOUT_MS             100
 211 #define DSI_RX_FIFO_EMPTY               0x30800002
 212
 213 #define OLD_SCLK_MIPI_CLK_NAME "pll_clk"
 214
 215 static const char *const clk_names[5] = { "bus_clk", "sclk_mipi",
 216         "phyclk_mipidphy0_bitclkdiv8", "phyclk_mipidphy0_rxclkesc0",
 217         "sclk_rgb_vclk_to_dsim0" };
 218
 219 enum exynos_dsi_transfer_type {
 220         EXYNOS_DSI_TX,
 221         EXYNOS_DSI_RX,
 222 };
 223
 224 struct exynos_dsi_transfer {
 225         struct list_head list;
 226         struct completion completed;
 227         int result;
 228         struct mipi_dsi_packet packet;
 229         u16 flags;
 230         u16 tx_done;
 231
 232         u8 *rx_payload;
 233         u16 rx_len;
 234         u16 rx_done;
 235 };
 236
 237 #define DSIM_STATE_ENABLED              BIT(0)
 238 #define DSIM_STATE_INITIALIZED          BIT(1)
 239 #define DSIM_STATE_CMD_LPM              BIT(2)
 240 #define DSIM_STATE_VIDOUT_AVAILABLE     BIT(3)
 241
 242 struct exynos_dsi_driver_data {
 243         const unsigned int *reg_ofs;
 244         unsigned int plltmr_reg;
 245         unsigned int has_freqband:1;
 246         unsigned int has_clklane_stop:1;
 247         unsigned int num_clks;
 248         unsigned int max_freq;
 249         unsigned int wait_for_reset;
 250         unsigned int num_bits_resol;
 251         const unsigned int *reg_values;
 252 };
 253
 254 struct exynos_dsi {
 255         struct drm_encoder encoder;
 256         struct mipi_dsi_host dsi_host;
 257         struct drm_connector connector;
 258         struct drm_panel *panel;
 259         struct list_head bridge_chain;
 260         struct drm_bridge *out_bridge;
 261         struct device *dev;
 262
 263         void __iomem *reg_base;
 264         struct phy *phy;
 265         struct clk **clks;
 266         struct regulator_bulk_data supplies[2];
 267         int irq;
 268         int te_gpio;
 269
 270         u32 pll_clk_rate;
 271         u32 burst_clk_rate;
 272         u32 esc_clk_rate;
 273         u32 lanes;
 274         u32 mode_flags;
 275         u32 format;
 276
 277         int state;
 278         struct drm_property *brightness;
 279         struct completion completed;
 280
 281         spinlock_t transfer_lock; /* protects transfer_list */
 282         struct list_head transfer_list;
 283
 284         const struct exynos_dsi_driver_data *driver_data;
 285 };
 286
 287 #define host_to_dsi(host) container_of(host, struct exynos_dsi, dsi_host)
 288 #define connector_to_dsi(c) container_of(c, struct exynos_dsi, connector)
 289
 290 static inline struct exynos_dsi *encoder_to_dsi(struct drm_encoder *e)
 291 {
 292         return container_of(e, struct exynos_dsi, encoder);
 293 }
 294
 295 enum reg_idx {
 296         DSIM_STATUS_REG,        /* Status register */
 297         DSIM_SWRST_REG,         /* Software reset register */
 298         DSIM_CLKCTRL_REG,       /* Clock control register */
 299         DSIM_TIMEOUT_REG,       /* Time out register */
 300         DSIM_CONFIG_REG,        /* Configuration register */
 301         DSIM_ESCMODE_REG,       /* Escape mode register */
 302         DSIM_MDRESOL_REG,
 303         DSIM_MVPORCH_REG,       /* Main display Vporch register */
 304         DSIM_MHPORCH_REG,       /* Main display Hporch register */
 305         DSIM_MSYNC_REG,         /* Main display sync area register */
 306         DSIM_INTSRC_REG,        /* Interrupt source register */
 307         DSIM_INTMSK_REG,        /* Interrupt mask register */
 308         DSIM_PKTHDR_REG,        /* Packet Header FIFO register */
 309         DSIM_PAYLOAD_REG,       /* Payload FIFO register */
 310         DSIM_RXFIFO_REG,        /* Read FIFO register */
 311         DSIM_FIFOCTRL_REG,      /* FIFO status and control register */
 312         DSIM_PLLCTRL_REG,       /* PLL control register */
 313         DSIM_PHYCTRL_REG,
 314         DSIM_PHYTIMING_REG,
 315         DSIM_PHYTIMING1_REG,
 316         DSIM_PHYTIMING2_REG,
 317         NUM_REGS
 318 };
 319
 320 static inline void exynos_dsi_write(struct exynos_dsi *dsi, enum reg_idx idx,
 321                                     u32 val)
 322 {
 323
 324         writel(val, dsi->reg_base + dsi->driver_data->reg_ofs[idx]);
 325 }
 326
 327 static inline u32 exynos_dsi_read(struct exynos_dsi *dsi, enum reg_idx idx)
 328 {
 329         return readl(dsi->reg_base + dsi->driver_data->reg_ofs[idx]);
 330 }
 331
 332 static const unsigned int exynos_reg_ofs[] = {
 333         [DSIM_STATUS_REG] =  0x00,
 334         [DSIM_SWRST_REG] =  0x04,
 335         [DSIM_CLKCTRL_REG] =  0x08,
 336         [DSIM_TIMEOUT_REG] =  0x0c,
 337         [DSIM_CONFIG_REG] =  0x10,
 338         [DSIM_ESCMODE_REG] =  0x14,
 339         [DSIM_MDRESOL_REG] =  0x18,
 340         [DSIM_MVPORCH_REG] =  0x1c,
 341         [DSIM_MHPORCH_REG] =  0x20,
 342         [DSIM_MSYNC_REG] =  0x24,
 343         [DSIM_INTSRC_REG] =  0x2c,
 344         [DSIM_INTMSK_REG] =  0x30,
 345         [DSIM_PKTHDR_REG] =  0x34,
 346         [DSIM_PAYLOAD_REG] =  0x38,
 347         [DSIM_RXFIFO_REG] =  0x3c,
 348         [DSIM_FIFOCTRL_REG] =  0x44,
 349         [DSIM_PLLCTRL_REG] =  0x4c,
 350         [DSIM_PHYCTRL_REG] =  0x5c,
 351         [DSIM_PHYTIMING_REG] =  0x64,
 352         [DSIM_PHYTIMING1_REG] =  0x68,
 353         [DSIM_PHYTIMING2_REG] =  0x6c,
 354 };
 355
 356 static const unsigned int exynos5433_reg_ofs[] = {
 357         [DSIM_STATUS_REG] = 0x04,
 358         [DSIM_SWRST_REG] = 0x0C,
 359         [DSIM_CLKCTRL_REG] = 0x10,
 360         [DSIM_TIMEOUT_REG] = 0x14,
 361         [DSIM_CONFIG_REG] = 0x18,
 362         [DSIM_ESCMODE_REG] = 0x1C,
 363         [DSIM_MDRESOL_REG] = 0x20,
 364         [DSIM_MVPORCH_REG] = 0x24,
 365         [DSIM_MHPORCH_REG] = 0x28,
 366         [DSIM_MSYNC_REG] = 0x2C,
 367         [DSIM_INTSRC_REG] = 0x34,
 368         [DSIM_INTMSK_REG] = 0x38,
 369         [DSIM_PKTHDR_REG] = 0x3C,
 370         [DSIM_PAYLOAD_REG] = 0x40,
 371         [DSIM_RXFIFO_REG] = 0x44,
 372         [DSIM_FIFOCTRL_REG] = 0x4C,
 373         [DSIM_PLLCTRL_REG] = 0x94,
 374         [DSIM_PHYCTRL_REG] = 0xA4,
 375         [DSIM_PHYTIMING_REG] = 0xB4,
 376         [DSIM_PHYTIMING1_REG] = 0xB8,
 377         [DSIM_PHYTIMING2_REG] = 0xBC,
 378 };
 379
 380 enum reg_value_idx {
 381         RESET_TYPE,
 382         PLL_TIMER,
 383         STOP_STATE_CNT,
 384         PHYCTRL_ULPS_EXIT,
 385         PHYCTRL_VREG_LP,
 386         PHYCTRL_SLEW_UP,
 387         PHYTIMING_LPX,
 388         PHYTIMING_HS_EXIT,
 389         PHYTIMING_CLK_PREPARE,
 390         PHYTIMING_CLK_ZERO,
 391         PHYTIMING_CLK_POST,
 392         PHYTIMING_CLK_TRAIL,
 393         PHYTIMING_HS_PREPARE,
 394         PHYTIMING_HS_ZERO,
 395         PHYTIMING_HS_TRAIL
 396 };
 397
 398 static const unsigned int reg_values[] = {
 399         [RESET_TYPE] = DSIM_SWRST,
 400         [PLL_TIMER] = 500,
 401         [STOP_STATE_CNT] = 0xf,
 402         [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0x0af),
 403         [PHYCTRL_VREG_LP] = 0,
 404         [PHYCTRL_SLEW_UP] = 0,
 405         [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x06),
 406         [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0b),
 407         [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x07),
 408         [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x27),
 409         [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0d),
 410         [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x08),
 411         [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x09),
 412         [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x0d),
 413         [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0b),
 414 };
 415
 416 static const unsigned int exynos5422_reg_values[] = {
 417         [RESET_TYPE] = DSIM_SWRST,
 418         [PLL_TIMER] = 500,
 419         [STOP_STATE_CNT] = 0xf,
 420         [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0xaf),
 421         [PHYCTRL_VREG_LP] = 0,
 422         [PHYCTRL_SLEW_UP] = 0,
 423         [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x08),
 424         [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0d),
 425         [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x09),
 426         [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x30),
 427         [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0e),
 428         [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x0a),
 429         [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x0c),
 430         [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x11),
 431         [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0d),
 432 };
 433
 434 static const unsigned int exynos5433_reg_values[] = {
 435         [RESET_TYPE] = DSIM_FUNCRST,
 436         [PLL_TIMER] = 22200,
 437         [STOP_STATE_CNT] = 0xa,
 438         [PHYCTRL_ULPS_EXIT] = DSIM_PHYCTRL_ULPS_EXIT(0x190),
 439         [PHYCTRL_VREG_LP] = DSIM_PHYCTRL_B_DPHYCTL_VREG_LP,
 440         [PHYCTRL_SLEW_UP] = DSIM_PHYCTRL_B_DPHYCTL_SLEW_UP,
 441         [PHYTIMING_LPX] = DSIM_PHYTIMING_LPX(0x07),
 442         [PHYTIMING_HS_EXIT] = DSIM_PHYTIMING_HS_EXIT(0x0c),
 443         [PHYTIMING_CLK_PREPARE] = DSIM_PHYTIMING1_CLK_PREPARE(0x09),
 444         [PHYTIMING_CLK_ZERO] = DSIM_PHYTIMING1_CLK_ZERO(0x2d),
 445         [PHYTIMING_CLK_POST] = DSIM_PHYTIMING1_CLK_POST(0x0e),
 446         [PHYTIMING_CLK_TRAIL] = DSIM_PHYTIMING1_CLK_TRAIL(0x09),
 447         [PHYTIMING_HS_PREPARE] = DSIM_PHYTIMING2_HS_PREPARE(0x0b),
 448         [PHYTIMING_HS_ZERO] = DSIM_PHYTIMING2_HS_ZERO(0x10),
 449         [PHYTIMING_HS_TRAIL] = DSIM_PHYTIMING2_HS_TRAIL(0x0c),
 450 };
 451
 452 static const struct exynos_dsi_driver_data exynos3_dsi_driver_data = {
 453         .reg_ofs = exynos_reg_ofs,
 454         .plltmr_reg = 0x50,
 455         .has_freqband = 1,
 456         .has_clklane_stop = 1,
 457         .num_clks = 2,
 458         .max_freq = 1000,
 459         .wait_for_reset = 1,
 460         .num_bits_resol = 11,
 461         .reg_values = reg_values,
 462 };
 463
 464 static const struct exynos_dsi_driver_data exynos4_dsi_driver_data = {
 465         .reg_ofs = exynos_reg_ofs,
 466         .plltmr_reg = 0x50,
 467         .has_freqband = 1,
 468         .has_clklane_stop = 1,
 469         .num_clks = 2,
 470         .max_freq = 1000,
 471         .wait_for_reset = 1,
 472         .num_bits_resol = 11,
 473         .reg_values = reg_values,
 474 };
 475
 476 static const struct exynos_dsi_driver_data exynos5_dsi_driver_data = {
 477         .reg_ofs = exynos_reg_ofs,
 478         .plltmr_reg = 0x58,
 479         .num_clks = 2,
 480         .max_freq = 1000,
 481         .wait_for_reset = 1,
 482         .num_bits_resol = 11,
 483         .reg_values = reg_values,
 484 };
 485
 486 static const struct exynos_dsi_driver_data exynos5433_dsi_driver_data = {
 487         .reg_ofs = exynos5433_reg_ofs,
 488         .plltmr_reg = 0xa0,
 489         .has_clklane_stop = 1,
 490         .num_clks = 5,
 491         .max_freq = 1500,
 492         .wait_for_reset = 0,
 493         .num_bits_resol = 12,
 494         .reg_values = exynos5433_reg_values,
 495 };
 496
 497 static const struct exynos_dsi_driver_data exynos5422_dsi_driver_data = {
 498         .reg_ofs = exynos5433_reg_ofs,
 499         .plltmr_reg = 0xa0,
 500         .has_clklane_stop = 1,
 501         .num_clks = 2,
 502         .max_freq = 1500,
 503         .wait_for_reset = 1,
 504         .num_bits_resol = 12,
 505         .reg_values = exynos5422_reg_values,
 506 };
 507
 508 static const struct of_device_id exynos_dsi_of_match[] = {
 509         { .compatible = "samsung,exynos3250-mipi-dsi",
 510           .data = &exynos3_dsi_driver_data },
 511         { .compatible = "samsung,exynos4210-mipi-dsi",
 512           .data = &exynos4_dsi_driver_data },
 513         { .compatible = "samsung,exynos5410-mipi-dsi",
 514           .data = &exynos5_dsi_driver_data },
 515         { .compatible = "samsung,exynos5422-mipi-dsi",
 516           .data = &exynos5422_dsi_driver_data },
 517         { .compatible = "samsung,exynos5433-mipi-dsi",
 518           .data = &exynos5433_dsi_driver_data },
 519         { }
 520 };
 521
 522 static void exynos_dsi_wait_for_reset(struct exynos_dsi *dsi)
 523 {
 524         if (wait_for_completion_timeout(&dsi->completed, msecs_to_jiffies(300)))
 525                 return;
 526
 527         dev_err(dsi->dev, "timeout waiting for reset\n");
 528 }
 529
 530 static void exynos_dsi_reset(struct exynos_dsi *dsi)
 531 {
 532         u32 reset_val = dsi->driver_data->reg_values[RESET_TYPE];
 533
 534         reinit_completion(&dsi->completed);
 535         exynos_dsi_write(dsi, DSIM_SWRST_REG, reset_val);
 536 }
 537
 538 #ifndef MHZ
 539 #define MHZ     (1000*1000)
 540 #endif
 541
 542 static unsigned long exynos_dsi_pll_find_pms(struct exynos_dsi *dsi,
 543                 unsigned long fin, unsigned long fout, u8 *p, u16 *m, u8 *s)
 544 {
 545         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 546         unsigned long best_freq = 0;
 547         u32 min_delta = 0xffffffff;
 548         u8 p_min, p_max;
 549         u8 _p, best_p;
 550         u16 _m, best_m;
 551         u8 _s, best_s;
 552
 553         p_min = DIV_ROUND_UP(fin, (12 * MHZ));
 554         p_max = fin / (6 * MHZ);
 555
 556         for (_p = p_min; _p <= p_max; ++_p) {
 557                 for (_s = 0; _s <= 5; ++_s) {
 558                         u64 tmp;
 559                         u32 delta;
 560
 561                         tmp = (u64)fout * (_p << _s);
 562                         do_div(tmp, fin);
 563                         _m = tmp;
 564                         if (_m < 41 || _m > 125)
 565                                 continue;
 566
 567                         tmp = (u64)_m * fin;
 568                         do_div(tmp, _p);
 569                         if (tmp < 500 * MHZ ||
 570                                         tmp > driver_data->max_freq * MHZ)
 571                                 continue;
 572
 573                         tmp = (u64)_m * fin;
 574                         do_div(tmp, _p << _s);
 575
 576                         delta = abs(fout - tmp);
 577                         if (delta < min_delta) {
 578                                 best_p = _p;
 579                                 best_m = _m;
 580                                 best_s = _s;
 581                                 min_delta = delta;
 582                                 best_freq = tmp;
 583                         }
 584                 }
 585         }
 586
 587         if (best_freq) {
 588                 *p = best_p;
 589                 *m = best_m;
 590                 *s = best_s;
 591         }
 592
 593         return best_freq;
 594 }
 595
 596 static unsigned long exynos_dsi_set_pll(struct exynos_dsi *dsi,
 597                                         unsigned long freq)
 598 {
 599         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 600         unsigned long fin, fout;
 601         int timeout;
 602         u8 p, s;
 603         u16 m;
 604         u32 reg;
 605
 606         fin = dsi->pll_clk_rate;
 607         fout = exynos_dsi_pll_find_pms(dsi, fin, freq, &p, &m, &s);
 608         if (!fout) {
 609                 dev_err(dsi->dev,
 610                         "failed to find PLL PMS for requested frequency\n");
 611                 return 0;
 612         }
 613         dev_dbg(dsi->dev, "PLL freq %lu, (p %d, m %d, s %d)\n", fout, p, m, s);
 614
 615         writel(driver_data->reg_values[PLL_TIMER],
 616                         dsi->reg_base + driver_data->plltmr_reg);
 617
 618         reg = DSIM_PLL_EN | DSIM_PLL_P(p) | DSIM_PLL_M(m) | DSIM_PLL_S(s);
 619
 620         if (driver_data->has_freqband) {
 621                 static const unsigned long freq_bands[] = {
 622                         100 * MHZ, 120 * MHZ, 160 * MHZ, 200 * MHZ,
 623                         270 * MHZ, 320 * MHZ, 390 * MHZ, 450 * MHZ,
 624                         510 * MHZ, 560 * MHZ, 640 * MHZ, 690 * MHZ,
 625                         770 * MHZ, 870 * MHZ, 950 * MHZ,
 626                 };
 627                 int band;
 628
 629                 for (band = 0; band < ARRAY_SIZE(freq_bands); ++band)
 630                         if (fout < freq_bands[band])
 631                                 break;
 632
 633                 dev_dbg(dsi->dev, "band %d\n", band);
 634
 635                 reg |= DSIM_FREQ_BAND(band);
 636         }
 637
 638         exynos_dsi_write(dsi, DSIM_PLLCTRL_REG, reg);
 639
 640         timeout = 1000;
 641         do {
 642                 if (timeout-- == 0) {
 643                         dev_err(dsi->dev, "PLL failed to stabilize\n");
 644                         return 0;
 645                 }
 646                 reg = exynos_dsi_read(dsi, DSIM_STATUS_REG);
 647         } while ((reg & DSIM_PLL_STABLE) == 0);
 648
 649         return fout;
 650 }
 651
 652 static int exynos_dsi_enable_clock(struct exynos_dsi *dsi)
 653 {
 654         unsigned long hs_clk, byte_clk, esc_clk;
 655         unsigned long esc_div;
 656         u32 reg;
 657
 658         hs_clk = exynos_dsi_set_pll(dsi, dsi->burst_clk_rate);
 659         if (!hs_clk) {
 660                 dev_err(dsi->dev, "failed to configure DSI PLL\n");
 661                 return -EFAULT;
 662         }
 663
 664         byte_clk = hs_clk / 8;
 665         esc_div = DIV_ROUND_UP(byte_clk, dsi->esc_clk_rate);
 666         esc_clk = byte_clk / esc_div;
 667
 668         if (esc_clk > 20 * MHZ) {
 669                 ++esc_div;
 670                 esc_clk = byte_clk / esc_div;
 671         }
 672
 673         dev_dbg(dsi->dev, "hs_clk = %lu, byte_clk = %lu, esc_clk = %lu\n",
 674                 hs_clk, byte_clk, esc_clk);
 675
 676         reg = exynos_dsi_read(dsi, DSIM_CLKCTRL_REG);
 677         reg &= ~(DSIM_ESC_PRESCALER_MASK | DSIM_LANE_ESC_CLK_EN_CLK
 678                         | DSIM_LANE_ESC_CLK_EN_DATA_MASK | DSIM_PLL_BYPASS
 679                         | DSIM_BYTE_CLK_SRC_MASK);
 680         reg |= DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN
 681                         | DSIM_ESC_PRESCALER(esc_div)
 682                         | DSIM_LANE_ESC_CLK_EN_CLK
 683                         | DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1)
 684                         | DSIM_BYTE_CLK_SRC(0)
 685                         | DSIM_TX_REQUEST_HSCLK;
 686         exynos_dsi_write(dsi, DSIM_CLKCTRL_REG, reg);
 687
 688         return 0;
 689 }
 690
 691 static void exynos_dsi_set_phy_ctrl(struct exynos_dsi *dsi)
 692 {
 693         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 694         const unsigned int *reg_values = driver_data->reg_values;
 695         u32 reg;
 696
 697         if (driver_data->has_freqband)
 698                 return;
 699
 700         /* B D-PHY: D-PHY Master & Slave Analog Block control */
 701         reg = reg_values[PHYCTRL_ULPS_EXIT] | reg_values[PHYCTRL_VREG_LP] |
 702                 reg_values[PHYCTRL_SLEW_UP];
 703         exynos_dsi_write(dsi, DSIM_PHYCTRL_REG, reg);
 704
 705         /*
 706          * T LPX: Transmitted length of any Low-Power state period
 707          * T HS-EXIT: Time that the transmitter drives LP-11 following a HS
 708          *      burst
 709          */
 710         reg = reg_values[PHYTIMING_LPX] | reg_values[PHYTIMING_HS_EXIT];
 711         exynos_dsi_write(dsi, DSIM_PHYTIMING_REG, reg);
 712
 713         /*
 714          * T CLK-PREPARE: Time that the transmitter drives the Clock Lane LP-00
 715          *      Line state immediately before the HS-0 Line state starting the
 716          *      HS transmission
 717          * T CLK-ZERO: Time that the transmitter drives the HS-0 state prior to
 718          *      transmitting the Clock.
 719          * T CLK_POST: Time that the transmitter continues to send HS clock
 720          *      after the last associated Data Lane has transitioned to LP Mode
 721          *      Interval is defined as the period from the end of T HS-TRAIL to
 722          *      the beginning of T CLK-TRAIL
 723          * T CLK-TRAIL: Time that the transmitter drives the HS-0 state after
 724          *      the last payload clock bit of a HS transmission burst
 725          */
 726         reg = reg_values[PHYTIMING_CLK_PREPARE] |
 727                 reg_values[PHYTIMING_CLK_ZERO] |
 728                 reg_values[PHYTIMING_CLK_POST] |
 729                 reg_values[PHYTIMING_CLK_TRAIL];
 730
 731         exynos_dsi_write(dsi, DSIM_PHYTIMING1_REG, reg);
 732
 733         /*
 734          * T HS-PREPARE: Time that the transmitter drives the Data Lane LP-00
 735          *      Line state immediately before the HS-0 Line state starting the
 736          *      HS transmission
 737          * T HS-ZERO: Time that the transmitter drives the HS-0 state prior to
 738          *      transmitting the Sync sequence.
 739          * T HS-TRAIL: Time that the transmitter drives the flipped differential
 740          *      state after last payload data bit of a HS transmission burst
 741          */
 742         reg = reg_values[PHYTIMING_HS_PREPARE] | reg_values[PHYTIMING_HS_ZERO] |
 743                 reg_values[PHYTIMING_HS_TRAIL];
 744         exynos_dsi_write(dsi, DSIM_PHYTIMING2_REG, reg);
 745 }
 746
 747 static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
 748 {
 749         u32 reg;
 750
 751         reg = exynos_dsi_read(dsi, DSIM_CLKCTRL_REG);
 752         reg &= ~(DSIM_LANE_ESC_CLK_EN_CLK | DSIM_LANE_ESC_CLK_EN_DATA_MASK
 753                         | DSIM_ESC_CLKEN | DSIM_BYTE_CLKEN);
 754         exynos_dsi_write(dsi, DSIM_CLKCTRL_REG, reg);
 755
 756         reg = exynos_dsi_read(dsi, DSIM_PLLCTRL_REG);
 757         reg &= ~DSIM_PLL_EN;
 758         exynos_dsi_write(dsi, DSIM_PLLCTRL_REG, reg);
 759 }
 760
 761 static void exynos_dsi_enable_lane(struct exynos_dsi *dsi, u32 lane)
 762 {
 763         u32 reg = exynos_dsi_read(dsi, DSIM_CONFIG_REG);
 764         reg |= (DSIM_NUM_OF_DATA_LANE(dsi->lanes - 1) | DSIM_LANE_EN_CLK |
 765                         DSIM_LANE_EN(lane));
 766         exynos_dsi_write(dsi, DSIM_CONFIG_REG, reg);
 767 }
 768
 769 static int exynos_dsi_init_link(struct exynos_dsi *dsi)
 770 {
 771         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
 772         int timeout;
 773         u32 reg;
 774         u32 lanes_mask;
 775
 776         /* Initialize FIFO pointers */
 777         reg = exynos_dsi_read(dsi, DSIM_FIFOCTRL_REG);
 778         reg &= ~0x1f;
 779         exynos_dsi_write(dsi, DSIM_FIFOCTRL_REG, reg);
 780
 781         usleep_range(9000, 11000);
 782
 783         reg |= 0x1f;
 784         exynos_dsi_write(dsi, DSIM_FIFOCTRL_REG, reg);
 785         usleep_range(9000, 11000);
 786
 787         /* DSI configuration */
 788         reg = 0;
 789
 790         /*
 791          * The first bit of mode_flags specifies display configuration.
 792          * If this bit is set[= MIPI_DSI_MODE_VIDEO], dsi will support video
 793          * mode, otherwise it will support command mode.
 794          */
 795         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
 796                 reg |= DSIM_VIDEO_MODE;
 797
 798                 /*
 799                  * The user manual describes that following bits are ignored in
 800                  * command mode.
 801                  */
 802                 if (!(dsi->mode_flags & MIPI_DSI_MODE_VSYNC_FLUSH))
 803                         reg |= DSIM_MFLUSH_VS;
 804                 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_SYNC_PULSE)
 805                         reg |= DSIM_SYNC_INFORM;
 806                 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST)
 807                         reg |= DSIM_BURST_MODE;
 808                 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_AUTO_VERT)
 809                         reg |= DSIM_AUTO_MODE;
 810                 if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO_HSE)
 811                         reg |= DSIM_HSE_MODE;
 812                 if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HFP))
 813                         reg |= DSIM_HFP_MODE;
 814                 if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HBP))
 815                         reg |= DSIM_HBP_MODE;
 816                 if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_NO_HSA))
 817                         reg |= DSIM_HSA_MODE;
 818         }
 819
 820         if (!(dsi->mode_flags & MIPI_DSI_MODE_NO_EOT_PACKET))
 821                 reg |= DSIM_EOT_DISABLE;
 822
 823         switch (dsi->format) {
 824         case MIPI_DSI_FMT_RGB888:
 825                 reg |= DSIM_MAIN_PIX_FORMAT_RGB888;
 826                 break;
 827         case MIPI_DSI_FMT_RGB666:
 828                 reg |= DSIM_MAIN_PIX_FORMAT_RGB666;
 829                 break;
 830         case MIPI_DSI_FMT_RGB666_PACKED:
 831                 reg |= DSIM_MAIN_PIX_FORMAT_RGB666_P;
 832                 break;
 833         case MIPI_DSI_FMT_RGB565:
 834                 reg |= DSIM_MAIN_PIX_FORMAT_RGB565;
 835                 break;
 836         default:
 837                 dev_err(dsi->dev, "invalid pixel format\n");
 838                 return -EINVAL;
 839         }
 840
 841         /*
 842          * Use non-continuous clock mode if the periparal wants and
 843          * host controller supports
 844          *
 845          * In non-continous clock mode, host controller will turn off
 846          * the HS clock between high-speed transmissions to reduce
 847          * power consumption.
 848          */
 849         if (driver_data->has_clklane_stop &&
 850                         dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {
 851                 reg |= DSIM_CLKLANE_STOP;
 852         }
 853         exynos_dsi_write(dsi, DSIM_CONFIG_REG, reg);
 854
 855         lanes_mask = BIT(dsi->lanes) - 1;
 856         exynos_dsi_enable_lane(dsi, lanes_mask);
 857
 858         /* Check clock and data lane state are stop state */
 859         timeout = 100;
 860         do {
 861                 if (timeout-- == 0) {
 862                         dev_err(dsi->dev, "waiting for bus lanes timed out\n");
 863                         return -EFAULT;
 864                 }
 865
 866                 reg = exynos_dsi_read(dsi, DSIM_STATUS_REG);
 867                 if ((reg & DSIM_STOP_STATE_DAT(lanes_mask))
 868                     != DSIM_STOP_STATE_DAT(lanes_mask))
 869                         continue;
 870         } while (!(reg & (DSIM_STOP_STATE_CLK | DSIM_TX_READY_HS_CLK)));
 871
 872         reg = exynos_dsi_read(dsi, DSIM_ESCMODE_REG);
 873         reg &= ~DSIM_STOP_STATE_CNT_MASK;
 874         reg |= DSIM_STOP_STATE_CNT(driver_data->reg_values[STOP_STATE_CNT]);
 875         exynos_dsi_write(dsi, DSIM_ESCMODE_REG, reg);
 876
 877         reg = DSIM_BTA_TIMEOUT(0xff) | DSIM_LPDR_TIMEOUT(0xffff);
 878         exynos_dsi_write(dsi, DSIM_TIMEOUT_REG, reg);
 879
 880         return 0;
 881 }
 882
 883 static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
 884 {
 885         struct drm_display_mode *m = &dsi->encoder.crtc->state->adjusted_mode;
 886         unsigned int num_bits_resol = dsi->driver_data->num_bits_resol;
 887         u32 reg;
 888
 889         if (dsi->mode_flags & MIPI_DSI_MODE_VIDEO) {
 890                 reg = DSIM_CMD_ALLOW(0xf)
 891                         | DSIM_STABLE_VFP(m->vsync_start - m->vdisplay)
 892                         | DSIM_MAIN_VBP(m->vtotal - m->vsync_end);
 893                 exynos_dsi_write(dsi, DSIM_MVPORCH_REG, reg);
 894
 895                 reg = DSIM_MAIN_HFP(m->hsync_start - m->hdisplay)
 896                         | DSIM_MAIN_HBP(m->htotal - m->hsync_end);
 897                 exynos_dsi_write(dsi, DSIM_MHPORCH_REG, reg);
 898
 899                 reg = DSIM_MAIN_VSA(m->vsync_end - m->vsync_start)
 900                         | DSIM_MAIN_HSA(m->hsync_end - m->hsync_start);
 901                 exynos_dsi_write(dsi, DSIM_MSYNC_REG, reg);
 902         }
 903         reg =  DSIM_MAIN_HRESOL(m->hdisplay, num_bits_resol) |
 904                 DSIM_MAIN_VRESOL(m->vdisplay, num_bits_resol);
 905
 906         exynos_dsi_write(dsi, DSIM_MDRESOL_REG, reg);
 907
 908         dev_dbg(dsi->dev, "LCD size = %dx%d\n", m->hdisplay, m->vdisplay);
 909 }
 910
 911 static void exynos_dsi_set_display_enable(struct exynos_dsi *dsi, bool enable)
 912 {
 913         u32 reg;
 914
 915         reg = exynos_dsi_read(dsi, DSIM_MDRESOL_REG);
 916         if (enable)
 917                 reg |= DSIM_MAIN_STAND_BY;
 918         else
 919                 reg &= ~DSIM_MAIN_STAND_BY;
 920         exynos_dsi_write(dsi, DSIM_MDRESOL_REG, reg);
 921 }
 922
 923 static int exynos_dsi_wait_for_hdr_fifo(struct exynos_dsi *dsi)
 924 {
 925         int timeout = 2000;
 926
 927         do {
 928                 u32 reg = exynos_dsi_read(dsi, DSIM_FIFOCTRL_REG);
 929
 930                 if (!(reg & DSIM_SFR_HEADER_FULL))
 931                         return 0;
 932
 933                 if (!cond_resched())
 934                         usleep_range(950, 1050);
 935         } while (--timeout);
 936
 937         return -ETIMEDOUT;
 938 }
 939
 940 static void exynos_dsi_set_cmd_lpm(struct exynos_dsi *dsi, bool lpm)
 941 {
 942         u32 v = exynos_dsi_read(dsi, DSIM_ESCMODE_REG);
 943
 944         if (lpm)
 945                 v |= DSIM_CMD_LPDT_LP;
 946         else
 947                 v &= ~DSIM_CMD_LPDT_LP;
 948
 949         exynos_dsi_write(dsi, DSIM_ESCMODE_REG, v);
 950 }
 951
 952 static void exynos_dsi_force_bta(struct exynos_dsi *dsi)
 953 {
 954         u32 v = exynos_dsi_read(dsi, DSIM_ESCMODE_REG);
 955         v |= DSIM_FORCE_BTA;
 956         exynos_dsi_write(dsi, DSIM_ESCMODE_REG, v);
 957 }
 958
 959 static void exynos_dsi_send_to_fifo(struct exynos_dsi *dsi,
 960                                         struct exynos_dsi_transfer *xfer)
 961 {
 962         struct device *dev = dsi->dev;
 963         struct mipi_dsi_packet *pkt = &xfer->packet;
 964         const u8 *payload = pkt->payload + xfer->tx_done;
 965         u16 length = pkt->payload_length - xfer->tx_done;
 966         bool first = !xfer->tx_done;
 967         u32 reg;
 968
 969         dev_dbg(dev, "< xfer %pK: tx len %u, done %u, rx len %u, done %u\n",
 970                 xfer, length, xfer->tx_done, xfer->rx_len, xfer->rx_done);
 971
 972         if (length > DSI_TX_FIFO_SIZE)
 973                 length = DSI_TX_FIFO_SIZE;
 974
 975         xfer->tx_done += length;
 976
 977         /* Send payload */
 978         while (length >= 4) {
 979                 reg = get_unaligned_le32(payload);
 980                 exynos_dsi_write(dsi, DSIM_PAYLOAD_REG, reg);
 981                 payload += 4;
 982                 length -= 4;
 983         }
 984
 985         reg = 0;
 986         switch (length) {
 987         case 3:
 988                 reg |= payload[2] << 16;
 989                 fallthrough;
 990         case 2:
 991                 reg |= payload[1] << 8;
 992                 fallthrough;
 993         case 1:
 994                 reg |= payload[0];
 995                 exynos_dsi_write(dsi, DSIM_PAYLOAD_REG, reg);
 996                 break;
 997         }
 998
 999         /* Send packet header */
1000         if (!first)
1001                 return;
1002
1003         reg = get_unaligned_le32(pkt->header);
1004         if (exynos_dsi_wait_for_hdr_fifo(dsi)) {
1005                 dev_err(dev, "waiting for header FIFO timed out\n");
1006                 return;
1007         }
1008
1009         if (NEQV(xfer->flags & MIPI_DSI_MSG_USE_LPM,
1010                  dsi->state & DSIM_STATE_CMD_LPM)) {
1011                 exynos_dsi_set_cmd_lpm(dsi, xfer->flags & MIPI_DSI_MSG_USE_LPM);
1012                 dsi->state ^= DSIM_STATE_CMD_LPM;
1013         }
1014
1015         exynos_dsi_write(dsi, DSIM_PKTHDR_REG, reg);
1016
1017         if (xfer->flags & MIPI_DSI_MSG_REQ_ACK)
1018                 exynos_dsi_force_bta(dsi);
1019 }
1020
1021 static void exynos_dsi_read_from_fifo(struct exynos_dsi *dsi,
1022                                         struct exynos_dsi_transfer *xfer)
1023 {
1024         u8 *payload = xfer->rx_payload + xfer->rx_done;
1025         bool first = !xfer->rx_done;
1026         struct device *dev = dsi->dev;
1027         u16 length;
1028         u32 reg;
1029
1030         if (first) {
1031                 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1032
1033                 switch (reg & 0x3f) {
1034                 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_2BYTE:
1035                 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_2BYTE:
1036                         if (xfer->rx_len >= 2) {
1037                                 payload[1] = reg >> 16;
1038                                 ++xfer->rx_done;
1039                         }
1040                         fallthrough;
1041                 case MIPI_DSI_RX_GENERIC_SHORT_READ_RESPONSE_1BYTE:
1042                 case MIPI_DSI_RX_DCS_SHORT_READ_RESPONSE_1BYTE:
1043                         payload[0] = reg >> 8;
1044                         ++xfer->rx_done;
1045                         xfer->rx_len = xfer->rx_done;
1046                         xfer->result = 0;
1047                         goto clear_fifo;
1048                 case MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT:
1049                         dev_err(dev, "DSI Error Report: 0x%04x\n",
1050                                 (reg >> 8) & 0xffff);
1051                         xfer->result = 0;
1052                         goto clear_fifo;
1053                 }
1054
1055                 length = (reg >> 8) & 0xffff;
1056                 if (length > xfer->rx_len) {
1057                         dev_err(dev,
1058                                 "response too long (%u > %u bytes), stripping\n",
1059                                 xfer->rx_len, length);
1060                         length = xfer->rx_len;
1061                 } else if (length < xfer->rx_len)
1062                         xfer->rx_len = length;
1063         }
1064
1065         length = xfer->rx_len - xfer->rx_done;
1066         xfer->rx_done += length;
1067
1068         /* Receive payload */
1069         while (length >= 4) {
1070                 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1071                 payload[0] = (reg >>  0) & 0xff;
1072                 payload[1] = (reg >>  8) & 0xff;
1073                 payload[2] = (reg >> 16) & 0xff;
1074                 payload[3] = (reg >> 24) & 0xff;
1075                 payload += 4;
1076                 length -= 4;
1077         }
1078
1079         if (length) {
1080                 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1081                 switch (length) {
1082                 case 3:
1083                         payload[2] = (reg >> 16) & 0xff;
1084                         fallthrough;
1085                 case 2:
1086                         payload[1] = (reg >> 8) & 0xff;
1087                         fallthrough;
1088                 case 1:
1089                         payload[0] = reg & 0xff;
1090                 }
1091         }
1092
1093         if (xfer->rx_done == xfer->rx_len)
1094                 xfer->result = 0;
1095
1096 clear_fifo:
1097         length = DSI_RX_FIFO_SIZE / 4;
1098         do {
1099                 reg = exynos_dsi_read(dsi, DSIM_RXFIFO_REG);
1100                 if (reg == DSI_RX_FIFO_EMPTY)
1101                         break;
1102         } while (--length);
1103 }
1104
1105 static void exynos_dsi_transfer_start(struct exynos_dsi *dsi)
1106 {
1107         unsigned long flags;
1108         struct exynos_dsi_transfer *xfer;
1109         bool start = false;
1110
1111 again:
1112         spin_lock_irqsave(&dsi->transfer_lock, flags);
1113
1114         if (list_empty(&dsi->transfer_list)) {
1115                 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1116                 return;
1117         }
1118
1119         xfer = list_first_entry(&dsi->transfer_list,
1120                                         struct exynos_dsi_transfer, list);
1121
1122         spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1123
1124         if (xfer->packet.payload_length &&
1125             xfer->tx_done == xfer->packet.payload_length)
1126                 /* waiting for RX */
1127                 return;
1128
1129         exynos_dsi_send_to_fifo(dsi, xfer);
1130
1131         if (xfer->packet.payload_length || xfer->rx_len)
1132                 return;
1133
1134         xfer->result = 0;
1135         complete(&xfer->completed);
1136
1137         spin_lock_irqsave(&dsi->transfer_lock, flags);
1138
1139         list_del_init(&xfer->list);
1140         start = !list_empty(&dsi->transfer_list);
1141
1142         spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1143
1144         if (start)
1145                 goto again;
1146 }
1147
1148 static bool exynos_dsi_transfer_finish(struct exynos_dsi *dsi)
1149 {
1150         struct exynos_dsi_transfer *xfer;
1151         unsigned long flags;
1152         bool start = true;
1153
1154         spin_lock_irqsave(&dsi->transfer_lock, flags);
1155
1156         if (list_empty(&dsi->transfer_list)) {
1157                 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1158                 return false;
1159         }
1160
1161         xfer = list_first_entry(&dsi->transfer_list,
1162                                         struct exynos_dsi_transfer, list);
1163
1164         spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1165
1166         dev_dbg(dsi->dev,
1167                 "> xfer %pK, tx_len %zu, tx_done %u, rx_len %u, rx_done %u\n",
1168                 xfer, xfer->packet.payload_length, xfer->tx_done, xfer->rx_len,
1169                 xfer->rx_done);
1170
1171         if (xfer->tx_done != xfer->packet.payload_length)
1172                 return true;
1173
1174         if (xfer->rx_done != xfer->rx_len)
1175                 exynos_dsi_read_from_fifo(dsi, xfer);
1176
1177         if (xfer->rx_done != xfer->rx_len)
1178                 return true;
1179
1180         spin_lock_irqsave(&dsi->transfer_lock, flags);
1181
1182         list_del_init(&xfer->list);
1183         start = !list_empty(&dsi->transfer_list);
1184
1185         spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1186
1187         if (!xfer->rx_len)
1188                 xfer->result = 0;
1189         complete(&xfer->completed);
1190
1191         return start;
1192 }
1193
1194 static void exynos_dsi_remove_transfer(struct exynos_dsi *dsi,
1195                                         struct exynos_dsi_transfer *xfer)
1196 {
1197         unsigned long flags;
1198         bool start;
1199
1200         spin_lock_irqsave(&dsi->transfer_lock, flags);
1201
1202         if (!list_empty(&dsi->transfer_list) &&
1203             xfer == list_first_entry(&dsi->transfer_list,
1204                                      struct exynos_dsi_transfer, list)) {
1205                 list_del_init(&xfer->list);
1206                 start = !list_empty(&dsi->transfer_list);
1207                 spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1208                 if (start)
1209                         exynos_dsi_transfer_start(dsi);
1210                 return;
1211         }
1212
1213         list_del_init(&xfer->list);
1214
1215         spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1216 }
1217
1218 static int exynos_dsi_transfer(struct exynos_dsi *dsi,
1219                                         struct exynos_dsi_transfer *xfer)
1220 {
1221         unsigned long flags;
1222         bool stopped;
1223
1224         xfer->tx_done = 0;
1225         xfer->rx_done = 0;
1226         xfer->result = -ETIMEDOUT;
1227         init_completion(&xfer->completed);
1228
1229         spin_lock_irqsave(&dsi->transfer_lock, flags);
1230
1231         stopped = list_empty(&dsi->transfer_list);
1232         list_add_tail(&xfer->list, &dsi->transfer_list);
1233
1234         spin_unlock_irqrestore(&dsi->transfer_lock, flags);
1235
1236         if (stopped)
1237                 exynos_dsi_transfer_start(dsi);
1238
1239         wait_for_completion_timeout(&xfer->completed,
1240                                     msecs_to_jiffies(DSI_XFER_TIMEOUT_MS));
1241         if (xfer->result == -ETIMEDOUT) {
1242                 struct mipi_dsi_packet *pkt = &xfer->packet;
1243                 exynos_dsi_remove_transfer(dsi, xfer);
1244                 dev_err(dsi->dev, "xfer timed out: %*ph %*ph\n", 4, pkt->header,
1245                         (int)pkt->payload_length, pkt->payload);
1246                 return -ETIMEDOUT;
1247         }
1248
1249         /* Also covers hardware timeout condition */
1250         return xfer->result;
1251 }
1252
1253 static irqreturn_t exynos_dsi_irq(int irq, void *dev_id)
1254 {
1255         struct exynos_dsi *dsi = dev_id;
1256         u32 status;
1257
1258         status = exynos_dsi_read(dsi, DSIM_INTSRC_REG);
1259         if (!status) {
1260                 static unsigned long int j;
1261                 if (printk_timed_ratelimit(&j, 500))
1262                         dev_warn(dsi->dev, "spurious interrupt\n");
1263                 return IRQ_HANDLED;
1264         }
1265         exynos_dsi_write(dsi, DSIM_INTSRC_REG, status);
1266
1267         if (status & DSIM_INT_SW_RST_RELEASE) {
1268                 u32 mask = ~(DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY |
1269                         DSIM_INT_SFR_HDR_FIFO_EMPTY | DSIM_INT_RX_ECC_ERR |
1270                         DSIM_INT_SW_RST_RELEASE);
1271                 exynos_dsi_write(dsi, DSIM_INTMSK_REG, mask);
1272                 complete(&dsi->completed);
1273                 return IRQ_HANDLED;
1274         }
1275
1276         if (!(status & (DSIM_INT_RX_DONE | DSIM_INT_SFR_FIFO_EMPTY |
1277                         DSIM_INT_PLL_STABLE)))
1278                 return IRQ_HANDLED;
1279
1280         if (exynos_dsi_transfer_finish(dsi))
1281                 exynos_dsi_transfer_start(dsi);
1282
1283         return IRQ_HANDLED;
1284 }
1285
1286 static irqreturn_t exynos_dsi_te_irq_handler(int irq, void *dev_id)
1287 {
1288         struct exynos_dsi *dsi = (struct exynos_dsi *)dev_id;
1289         struct drm_encoder *encoder = &dsi->encoder;
1290
1291         if (dsi->state & DSIM_STATE_VIDOUT_AVAILABLE)
1292                 exynos_drm_crtc_te_handler(encoder->crtc);
1293
1294         return IRQ_HANDLED;
1295 }
1296
1297 static void exynos_dsi_enable_irq(struct exynos_dsi *dsi)
1298 {
1299         enable_irq(dsi->irq);
1300
1301         if (gpio_is_valid(dsi->te_gpio))
1302                 enable_irq(gpio_to_irq(dsi->te_gpio));
1303 }
1304
1305 static void exynos_dsi_disable_irq(struct exynos_dsi *dsi)
1306 {
1307         if (gpio_is_valid(dsi->te_gpio))
1308                 disable_irq(gpio_to_irq(dsi->te_gpio));
1309
1310         disable_irq(dsi->irq);
1311 }
1312
1313 static int exynos_dsi_init(struct exynos_dsi *dsi)
1314 {
1315         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
1316
1317         exynos_dsi_reset(dsi);
1318         exynos_dsi_enable_irq(dsi);
1319
1320         if (driver_data->reg_values[RESET_TYPE] == DSIM_FUNCRST)
1321                 exynos_dsi_enable_lane(dsi, BIT(dsi->lanes) - 1);
1322
1323         exynos_dsi_enable_clock(dsi);
1324         if (driver_data->wait_for_reset)
1325                 exynos_dsi_wait_for_reset(dsi);
1326         exynos_dsi_set_phy_ctrl(dsi);
1327         exynos_dsi_init_link(dsi);
1328
1329         return 0;
1330 }
1331
1332 static int exynos_dsi_register_te_irq(struct exynos_dsi *dsi,
1333                                       struct device *panel)
1334 {
1335         int ret;
1336         int te_gpio_irq;
1337
1338         dsi->te_gpio = of_get_named_gpio(panel->of_node, "te-gpios", 0);
1339         if (dsi->te_gpio == -ENOENT)
1340                 return 0;
1341
1342         if (!gpio_is_valid(dsi->te_gpio)) {
1343                 ret = dsi->te_gpio;
1344                 dev_err(dsi->dev, "cannot get te-gpios, %d\n", ret);
1345                 goto out;
1346         }
1347
1348         ret = gpio_request(dsi->te_gpio, "te_gpio");
1349         if (ret) {
1350                 dev_err(dsi->dev, "gpio request failed with %d\n", ret);
1351                 goto out;
1352         }
1353
1354         te_gpio_irq = gpio_to_irq(dsi->te_gpio);
1355
1356         ret = request_threaded_irq(te_gpio_irq, exynos_dsi_te_irq_handler, NULL,
1357                                    IRQF_TRIGGER_RISING | IRQF_NO_AUTOEN, "TE", dsi);
1358         if (ret) {
1359                 dev_err(dsi->dev, "request interrupt failed with %d\n", ret);
1360                 gpio_free(dsi->te_gpio);
1361                 goto out;
1362         }
1363
1364 out:
1365         return ret;
1366 }
1367
1368 static void exynos_dsi_unregister_te_irq(struct exynos_dsi *dsi)
1369 {
1370         if (gpio_is_valid(dsi->te_gpio)) {
1371                 free_irq(gpio_to_irq(dsi->te_gpio), dsi);
1372                 gpio_free(dsi->te_gpio);
1373                 dsi->te_gpio = -ENOENT;
1374         }
1375 }
1376
1377 static void exynos_dsi_enable(struct drm_encoder *encoder)
1378 {
1379         struct exynos_dsi *dsi = encoder_to_dsi(encoder);
1380         struct drm_bridge *iter;
1381         int ret;
1382
1383         if (dsi->state & DSIM_STATE_ENABLED)
1384                 return;
1385
1386         ret = pm_runtime_resume_and_get(dsi->dev);
1387         if (ret < 0) {
1388                 dev_err(dsi->dev, "failed to enable DSI device.\n");
1389                 return;
1390         }
1391
1392         dsi->state |= DSIM_STATE_ENABLED;
1393
1394         if (dsi->panel) {
1395                 ret = drm_panel_prepare(dsi->panel);
1396                 if (ret < 0)
1397                         goto err_put_sync;
1398         } else {
1399                 list_for_each_entry_reverse(iter, &dsi->bridge_chain,
1400                                             chain_node) {
1401                         if (iter->funcs->pre_enable)
1402                                 iter->funcs->pre_enable(iter);
1403                 }
1404         }
1405
1406         exynos_dsi_set_display_mode(dsi);
1407         exynos_dsi_set_display_enable(dsi, true);
1408
1409         if (dsi->panel) {
1410                 ret = drm_panel_enable(dsi->panel);
1411                 if (ret < 0)
1412                         goto err_display_disable;
1413         } else {
1414                 list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
1415                         if (iter->funcs->enable)
1416                                 iter->funcs->enable(iter);
1417                 }
1418         }
1419
1420         dsi->state |= DSIM_STATE_VIDOUT_AVAILABLE;
1421         return;
1422
1423 err_display_disable:
1424         exynos_dsi_set_display_enable(dsi, false);
1425         drm_panel_unprepare(dsi->panel);
1426
1427 err_put_sync:
1428         dsi->state &= ~DSIM_STATE_ENABLED;
1429         pm_runtime_put(dsi->dev);
1430 }
1431
1432 static void exynos_dsi_disable(struct drm_encoder *encoder)
1433 {
1434         struct exynos_dsi *dsi = encoder_to_dsi(encoder);
1435         struct drm_bridge *iter;
1436
1437         if (!(dsi->state & DSIM_STATE_ENABLED))
1438                 return;
1439
1440         dsi->state &= ~DSIM_STATE_VIDOUT_AVAILABLE;
1441
1442         drm_panel_disable(dsi->panel);
1443
1444         list_for_each_entry_reverse(iter, &dsi->bridge_chain, chain_node) {
1445                 if (iter->funcs->disable)
1446                         iter->funcs->disable(iter);
1447         }
1448
1449         exynos_dsi_set_display_enable(dsi, false);
1450         drm_panel_unprepare(dsi->panel);
1451
1452         list_for_each_entry(iter, &dsi->bridge_chain, chain_node) {
1453                 if (iter->funcs->post_disable)
1454                         iter->funcs->post_disable(iter);
1455         }
1456
1457         dsi->state &= ~DSIM_STATE_ENABLED;
1458         pm_runtime_put_sync(dsi->dev);
1459 }
1460
1461 static enum drm_connector_status
1462 exynos_dsi_detect(struct drm_connector *connector, bool force)
1463 {
1464         return connector->status;
1465 }
1466
1467 static void exynos_dsi_connector_destroy(struct drm_connector *connector)
1468 {
1469         drm_connector_unregister(connector);
1470         drm_connector_cleanup(connector);
1471         connector->dev = NULL;
1472 }
1473
1474 static const struct drm_connector_funcs exynos_dsi_connector_funcs = {
1475         .detect = exynos_dsi_detect,
1476         .fill_modes = drm_helper_probe_single_connector_modes,
1477         .destroy = exynos_dsi_connector_destroy,
1478         .reset = drm_atomic_helper_connector_reset,
1479         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1480         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1481 };
1482
1483 static int exynos_dsi_get_modes(struct drm_connector *connector)
1484 {
1485         struct exynos_dsi *dsi = connector_to_dsi(connector);
1486
1487         if (dsi->panel)
1488                 return drm_panel_get_modes(dsi->panel, connector);
1489
1490         return 0;
1491 }
1492
1493 static const struct drm_connector_helper_funcs exynos_dsi_connector_helper_funcs = {
1494         .get_modes = exynos_dsi_get_modes,
1495 };
1496
1497 static int exynos_dsi_create_connector(struct drm_encoder *encoder)
1498 {
1499         struct exynos_dsi *dsi = encoder_to_dsi(encoder);
1500         struct drm_connector *connector = &dsi->connector;
1501         struct drm_device *drm = encoder->dev;
1502         int ret;
1503
1504         connector->polled = DRM_CONNECTOR_POLL_HPD;
1505
1506         ret = drm_connector_init(drm, connector, &exynos_dsi_connector_funcs,
1507                                  DRM_MODE_CONNECTOR_DSI);
1508         if (ret) {
1509                 DRM_DEV_ERROR(dsi->dev,
1510                               "Failed to initialize connector with drm\n");
1511                 return ret;
1512         }
1513
1514         connector->status = connector_status_disconnected;
1515         drm_connector_helper_add(connector, &exynos_dsi_connector_helper_funcs);
1516         drm_connector_attach_encoder(connector, encoder);
1517         if (!drm->registered)
1518                 return 0;
1519
1520         connector->funcs->reset(connector);
1521         drm_connector_register(connector);
1522         return 0;
1523 }
1524
1525 static const struct drm_encoder_helper_funcs exynos_dsi_encoder_helper_funcs = {
1526         .enable = exynos_dsi_enable,
1527         .disable = exynos_dsi_disable,
1528 };
1529
1530 MODULE_DEVICE_TABLE(of, exynos_dsi_of_match);
1531
1532 static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
1533                                   struct mipi_dsi_device *device)
1534 {
1535         struct exynos_dsi *dsi = host_to_dsi(host);
1536         struct drm_encoder *encoder = &dsi->encoder;
1537         struct drm_device *drm = encoder->dev;
1538         struct drm_bridge *out_bridge;
1539
1540         out_bridge  = of_drm_find_bridge(device->dev.of_node);
1541         if (out_bridge) {
1542                 drm_bridge_attach(encoder, out_bridge, NULL, 0);
1543                 dsi->out_bridge = out_bridge;
1544                 list_splice_init(&encoder->bridge_chain, &dsi->bridge_chain);
1545         } else {
1546                 int ret = exynos_dsi_create_connector(encoder);
1547
1548                 if (ret) {
1549                         DRM_DEV_ERROR(dsi->dev,
1550                                       "failed to create connector ret = %d\n",
1551                                       ret);
1552                         drm_encoder_cleanup(encoder);
1553                         return ret;
1554                 }
1555
1556                 dsi->panel = of_drm_find_panel(device->dev.of_node);
1557                 if (IS_ERR(dsi->panel))
1558                         dsi->panel = NULL;
1559                 else
1560                         dsi->connector.status = connector_status_connected;
1561         }
1562
1563         /*
1564          * This is a temporary solution and should be made by more generic way.
1565          *
1566          * If attached panel device is for command mode one, dsi should register
1567          * TE interrupt handler.
1568          */
1569         if (!(device->mode_flags & MIPI_DSI_MODE_VIDEO)) {
1570                 int ret = exynos_dsi_register_te_irq(dsi, &device->dev);
1571                 if (ret)
1572                         return ret;
1573         }
1574
1575         mutex_lock(&drm->mode_config.mutex);
1576
1577         dsi->lanes = device->lanes;
1578         dsi->format = device->format;
1579         dsi->mode_flags = device->mode_flags;
1580         exynos_drm_crtc_get_by_type(drm, EXYNOS_DISPLAY_TYPE_LCD)->i80_mode =
1581                         !(dsi->mode_flags & MIPI_DSI_MODE_VIDEO);
1582
1583         mutex_unlock(&drm->mode_config.mutex);
1584
1585         if (drm->mode_config.poll_enabled)
1586                 drm_kms_helper_hotplug_event(drm);
1587
1588         return 0;
1589 }
1590
1591 static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
1592                                   struct mipi_dsi_device *device)
1593 {
1594         struct exynos_dsi *dsi = host_to_dsi(host);
1595         struct drm_device *drm = dsi->encoder.dev;
1596
1597         if (dsi->panel) {
1598                 mutex_lock(&drm->mode_config.mutex);
1599                 exynos_dsi_disable(&dsi->encoder);
1600                 dsi->panel = NULL;
1601                 dsi->connector.status = connector_status_disconnected;
1602                 mutex_unlock(&drm->mode_config.mutex);
1603         } else {
1604                 if (dsi->out_bridge->funcs->detach)
1605                         dsi->out_bridge->funcs->detach(dsi->out_bridge);
1606                 dsi->out_bridge = NULL;
1607                 INIT_LIST_HEAD(&dsi->bridge_chain);
1608         }
1609
1610         if (drm->mode_config.poll_enabled)
1611                 drm_kms_helper_hotplug_event(drm);
1612
1613         exynos_dsi_unregister_te_irq(dsi);
1614
1615         return 0;
1616 }
1617
1618 static ssize_t exynos_dsi_host_transfer(struct mipi_dsi_host *host,
1619                                          const struct mipi_dsi_msg *msg)
1620 {
1621         struct exynos_dsi *dsi = host_to_dsi(host);
1622         struct exynos_dsi_transfer xfer;
1623         int ret;
1624
1625         if (!(dsi->state & DSIM_STATE_ENABLED))
1626                 return -EINVAL;
1627
1628         if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
1629                 ret = exynos_dsi_init(dsi);
1630                 if (ret)
1631                         return ret;
1632                 dsi->state |= DSIM_STATE_INITIALIZED;
1633         }
1634
1635         ret = mipi_dsi_create_packet(&xfer.packet, msg);
1636         if (ret < 0)
1637                 return ret;
1638
1639         xfer.rx_len = msg->rx_len;
1640         xfer.rx_payload = msg->rx_buf;
1641         xfer.flags = msg->flags;
1642
1643         ret = exynos_dsi_transfer(dsi, &xfer);
1644         return (ret < 0) ? ret : xfer.rx_done;
1645 }
1646
1647 static const struct mipi_dsi_host_ops exynos_dsi_ops = {
1648         .attach = exynos_dsi_host_attach,
1649         .detach = exynos_dsi_host_detach,
1650         .transfer = exynos_dsi_host_transfer,
1651 };
1652
1653 static int exynos_dsi_of_read_u32(const struct device_node *np,
1654                                   const char *propname, u32 *out_value)
1655 {
1656         int ret = of_property_read_u32(np, propname, out_value);
1657
1658         if (ret < 0)
1659                 pr_err("%pOF: failed to get '%s' property\n", np, propname);
1660
1661         return ret;
1662 }
1663
1664 enum {
1665         DSI_PORT_IN,
1666         DSI_PORT_OUT
1667 };
1668
1669 static int exynos_dsi_parse_dt(struct exynos_dsi *dsi)
1670 {
1671         struct device *dev = dsi->dev;
1672         struct device_node *node = dev->of_node;
1673         int ret;
1674
1675         ret = exynos_dsi_of_read_u32(node, "samsung,pll-clock-frequency",
1676                                      &dsi->pll_clk_rate);
1677         if (ret < 0)
1678                 return ret;
1679
1680         ret = exynos_dsi_of_read_u32(node, "samsung,burst-clock-frequency",
1681                                      &dsi->burst_clk_rate);
1682         if (ret < 0)
1683                 return ret;
1684
1685         ret = exynos_dsi_of_read_u32(node, "samsung,esc-clock-frequency",
1686                                      &dsi->esc_clk_rate);
1687         if (ret < 0)
1688                 return ret;
1689
1690         return 0;
1691 }
1692
1693 static int exynos_dsi_bind(struct device *dev, struct device *master,
1694                                 void *data)
1695 {
1696         struct exynos_dsi *dsi = dev_get_drvdata(dev);
1697         struct drm_encoder *encoder = &dsi->encoder;
1698         struct drm_device *drm_dev = data;
1699         struct device_node *in_bridge_node;
1700         struct drm_bridge *in_bridge;
1701         int ret;
1702
1703         drm_simple_encoder_init(drm_dev, encoder, DRM_MODE_ENCODER_TMDS);
1704
1705         drm_encoder_helper_add(encoder, &exynos_dsi_encoder_helper_funcs);
1706
1707         ret = exynos_drm_set_possible_crtcs(encoder, EXYNOS_DISPLAY_TYPE_LCD);
1708         if (ret < 0)
1709                 return ret;
1710
1711         in_bridge_node = of_graph_get_remote_node(dev->of_node, DSI_PORT_IN, 0);
1712         if (in_bridge_node) {
1713                 in_bridge = of_drm_find_bridge(in_bridge_node);
1714                 if (in_bridge)
1715                         drm_bridge_attach(encoder, in_bridge, NULL, 0);
1716                 of_node_put(in_bridge_node);
1717         }
1718
1719         return mipi_dsi_host_register(&dsi->dsi_host);
1720 }
1721
1722 static void exynos_dsi_unbind(struct device *dev, struct device *master,
1723                                 void *data)
1724 {
1725         struct exynos_dsi *dsi = dev_get_drvdata(dev);
1726         struct drm_encoder *encoder = &dsi->encoder;
1727
1728         exynos_dsi_disable(encoder);
1729
1730         mipi_dsi_host_unregister(&dsi->dsi_host);
1731 }
1732
1733 static const struct component_ops exynos_dsi_component_ops = {
1734         .bind   = exynos_dsi_bind,
1735         .unbind = exynos_dsi_unbind,
1736 };
1737
1738 static int exynos_dsi_probe(struct platform_device *pdev)
1739 {
1740         struct device *dev = &pdev->dev;
1741         struct resource *res;
1742         struct exynos_dsi *dsi;
1743         int ret, i;
1744
1745         dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
1746         if (!dsi)
1747                 return -ENOMEM;
1748
1749         /* To be checked as invalid one */
1750         dsi->te_gpio = -ENOENT;
1751
1752         init_completion(&dsi->completed);
1753         spin_lock_init(&dsi->transfer_lock);
1754         INIT_LIST_HEAD(&dsi->transfer_list);
1755         INIT_LIST_HEAD(&dsi->bridge_chain);
1756
1757         dsi->dsi_host.ops = &exynos_dsi_ops;
1758         dsi->dsi_host.dev = dev;
1759
1760         dsi->dev = dev;
1761         dsi->driver_data = of_device_get_match_data(dev);
1762
1763         dsi->supplies[0].supply = "vddcore";
1764         dsi->supplies[1].supply = "vddio";
1765         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(dsi->supplies),
1766                                       dsi->supplies);
1767         if (ret)
1768                 return dev_err_probe(dev, ret, "failed to get regulators\n");
1769
1770         dsi->clks = devm_kcalloc(dev,
1771                         dsi->driver_data->num_clks, sizeof(*dsi->clks),
1772                         GFP_KERNEL);
1773         if (!dsi->clks)
1774                 return -ENOMEM;
1775
1776         for (i = 0; i < dsi->driver_data->num_clks; i++) {
1777                 dsi->clks[i] = devm_clk_get(dev, clk_names[i]);
1778                 if (IS_ERR(dsi->clks[i])) {
1779                         if (strcmp(clk_names[i], "sclk_mipi") == 0) {
1780                                 dsi->clks[i] = devm_clk_get(dev,
1781                                                         OLD_SCLK_MIPI_CLK_NAME);
1782                                 if (!IS_ERR(dsi->clks[i]))
1783                                         continue;
1784                         }
1785
1786                         dev_info(dev, "failed to get the clock: %s\n",
1787                                         clk_names[i]);
1788                         return PTR_ERR(dsi->clks[i]);
1789                 }
1790         }
1791
1792         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1793         dsi->reg_base = devm_ioremap_resource(dev, res);
1794         if (IS_ERR(dsi->reg_base))
1795                 return PTR_ERR(dsi->reg_base);
1796
1797         dsi->phy = devm_phy_get(dev, "dsim");
1798         if (IS_ERR(dsi->phy)) {
1799                 dev_info(dev, "failed to get dsim phy\n");
1800                 return PTR_ERR(dsi->phy);
1801         }
1802
1803         dsi->irq = platform_get_irq(pdev, 0);
1804         if (dsi->irq < 0)
1805                 return dsi->irq;
1806
1807         ret = devm_request_threaded_irq(dev, dsi->irq, NULL,
1808                                         exynos_dsi_irq,
1809                                         IRQF_ONESHOT | IRQF_NO_AUTOEN,
1810                                         dev_name(dev), dsi);
1811         if (ret) {
1812                 dev_err(dev, "failed to request dsi irq\n");
1813                 return ret;
1814         }
1815
1816         ret = exynos_dsi_parse_dt(dsi);
1817         if (ret)
1818                 return ret;
1819
1820         platform_set_drvdata(pdev, dsi);
1821
1822         pm_runtime_enable(dev);
1823
1824         ret = component_add(dev, &exynos_dsi_component_ops);
1825         if (ret)
1826                 goto err_disable_runtime;
1827
1828         return 0;
1829
1830 err_disable_runtime:
1831         pm_runtime_disable(dev);
1832
1833         return ret;
1834 }
1835
1836 static int exynos_dsi_remove(struct platform_device *pdev)
1837 {
1838         pm_runtime_disable(&pdev->dev);
1839
1840         component_del(&pdev->dev, &exynos_dsi_component_ops);
1841
1842         return 0;
1843 }
1844
1845 static int __maybe_unused exynos_dsi_suspend(struct device *dev)
1846 {
1847         struct exynos_dsi *dsi = dev_get_drvdata(dev);
1848         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
1849         int ret, i;
1850
1851         usleep_range(10000, 20000);
1852
1853         if (dsi->state & DSIM_STATE_INITIALIZED) {
1854                 dsi->state &= ~DSIM_STATE_INITIALIZED;
1855
1856                 exynos_dsi_disable_clock(dsi);
1857
1858                 exynos_dsi_disable_irq(dsi);
1859         }
1860
1861         dsi->state &= ~DSIM_STATE_CMD_LPM;
1862
1863         phy_power_off(dsi->phy);
1864
1865         for (i = driver_data->num_clks - 1; i > -1; i--)
1866                 clk_disable_unprepare(dsi->clks[i]);
1867
1868         ret = regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
1869         if (ret < 0)
1870                 dev_err(dsi->dev, "cannot disable regulators %d\n", ret);
1871
1872         return 0;
1873 }
1874
1875 static int __maybe_unused exynos_dsi_resume(struct device *dev)
1876 {
1877         struct exynos_dsi *dsi = dev_get_drvdata(dev);
1878         const struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
1879         int ret, i;
1880
1881         ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
1882         if (ret < 0) {
1883                 dev_err(dsi->dev, "cannot enable regulators %d\n", ret);
1884                 return ret;
1885         }
1886
1887         for (i = 0; i < driver_data->num_clks; i++) {
1888                 ret = clk_prepare_enable(dsi->clks[i]);
1889                 if (ret < 0)
1890                         goto err_clk;
1891         }
1892
1893         ret = phy_power_on(dsi->phy);
1894         if (ret < 0) {
1895                 dev_err(dsi->dev, "cannot enable phy %d\n", ret);
1896                 goto err_clk;
1897         }
1898
1899         return 0;
1900
1901 err_clk:
1902         while (--i > -1)
1903                 clk_disable_unprepare(dsi->clks[i]);
1904         regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
1905
1906         return ret;
1907 }
1908
1909 static const struct dev_pm_ops exynos_dsi_pm_ops = {
1910         SET_RUNTIME_PM_OPS(exynos_dsi_suspend, exynos_dsi_resume, NULL)
1911         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
1912                                 pm_runtime_force_resume)
1913 };
1914
1915 struct platform_driver dsi_driver = {
1916         .probe = exynos_dsi_probe,
1917         .remove = exynos_dsi_remove,
1918         .driver = {
1919                    .name = "exynos-dsi",
1920                    .owner = THIS_MODULE,
1921                    .pm = &exynos_dsi_pm_ops,
1922                    .of_match_table = exynos_dsi_of_match,
1923         },
1924 };
1925
1926 MODULE_AUTHOR("Tomasz Figa <[email protected]>");
1927 MODULE_AUTHOR("Andrzej Hajda <[email protected]>");
1928 MODULE_DESCRIPTION("Samsung SoC MIPI DSI Master");
1929 MODULE_LICENSE("GPL v2");