drivers/gpu/drm/xlnx/zynqmp_dp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * ZynqMP DisplayPort Driver
   4  *
   5  * Copyright (C) 2017 - 2020 Xilinx, Inc.
   6  *
   7  * Authors:
   8  * - Hyun Woo Kwon <[email protected]>
   9  * - Laurent Pinchart <[email protected]>
  10  */
  11
  12 #include <drm/display/drm_dp_helper.h>
  13 #include <drm/drm_atomic_helper.h>
  14 #include <drm/drm_crtc.h>
  15 #include <drm/drm_device.h>
  16 #include <drm/drm_edid.h>
  17 #include <drm/drm_fourcc.h>
  18 #include <drm/drm_modes.h>
  19 #include <drm/drm_of.h>
  20
  21 #include <linux/clk.h>
  22 #include <linux/delay.h>
  23 #include <linux/device.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/phy/phy.h>
  29 #include <linux/reset.h>
  30 #include <linux/slab.h>
  31
  32 #include "zynqmp_disp.h"
  33 #include "zynqmp_dp.h"
  34 #include "zynqmp_dpsub.h"
  35 #include "zynqmp_kms.h"
  36
  37 static uint zynqmp_dp_aux_timeout_ms = 50;
  38 module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444);
  39 MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)");
  40
  41 /*
  42  * Some sink requires a delay after power on request
  43  */
  44 static uint zynqmp_dp_power_on_delay_ms = 4;
  45 module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444);
  46 MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)");
  47
  48 /* Link configuration registers */
  49 #define ZYNQMP_DP_LINK_BW_SET                           0x0
  50 #define ZYNQMP_DP_LANE_COUNT_SET                        0x4
  51 #define ZYNQMP_DP_ENHANCED_FRAME_EN                     0x8
  52 #define ZYNQMP_DP_TRAINING_PATTERN_SET                  0xc
  53 #define ZYNQMP_DP_SCRAMBLING_DISABLE                    0x14
  54 #define ZYNQMP_DP_DOWNSPREAD_CTL                        0x18
  55 #define ZYNQMP_DP_SOFTWARE_RESET                        0x1c
  56 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM1                BIT(0)
  57 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM2                BIT(1)
  58 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM3                BIT(2)
  59 #define ZYNQMP_DP_SOFTWARE_RESET_STREAM4                BIT(3)
  60 #define ZYNQMP_DP_SOFTWARE_RESET_AUX                    BIT(7)
  61 #define ZYNQMP_DP_SOFTWARE_RESET_ALL                    (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \
  62                                                          ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \
  63                                                          ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \
  64                                                          ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \
  65                                                          ZYNQMP_DP_SOFTWARE_RESET_AUX)
  66
  67 /* Core enable registers */
  68 #define ZYNQMP_DP_TRANSMITTER_ENABLE                    0x80
  69 #define ZYNQMP_DP_MAIN_STREAM_ENABLE                    0x84
  70 #define ZYNQMP_DP_FORCE_SCRAMBLER_RESET                 0xc0
  71 #define ZYNQMP_DP_VERSION                               0xf8
  72 #define ZYNQMP_DP_VERSION_MAJOR_MASK                    GENMASK(31, 24)
  73 #define ZYNQMP_DP_VERSION_MAJOR_SHIFT                   24
  74 #define ZYNQMP_DP_VERSION_MINOR_MASK                    GENMASK(23, 16)
  75 #define ZYNQMP_DP_VERSION_MINOR_SHIFT                   16
  76 #define ZYNQMP_DP_VERSION_REVISION_MASK                 GENMASK(15, 12)
  77 #define ZYNQMP_DP_VERSION_REVISION_SHIFT                12
  78 #define ZYNQMP_DP_VERSION_PATCH_MASK                    GENMASK(11, 8)
  79 #define ZYNQMP_DP_VERSION_PATCH_SHIFT                   8
  80 #define ZYNQMP_DP_VERSION_INTERNAL_MASK                 GENMASK(7, 0)
  81 #define ZYNQMP_DP_VERSION_INTERNAL_SHIFT                0
  82
  83 /* Core ID registers */
  84 #define ZYNQMP_DP_CORE_ID                               0xfc
  85 #define ZYNQMP_DP_CORE_ID_MAJOR_MASK                    GENMASK(31, 24)
  86 #define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT                   24
  87 #define ZYNQMP_DP_CORE_ID_MINOR_MASK                    GENMASK(23, 16)
  88 #define ZYNQMP_DP_CORE_ID_MINOR_SHIFT                   16
  89 #define ZYNQMP_DP_CORE_ID_REVISION_MASK                 GENMASK(15, 8)
  90 #define ZYNQMP_DP_CORE_ID_REVISION_SHIFT                8
  91 #define ZYNQMP_DP_CORE_ID_DIRECTION                     GENMASK(1)
  92
  93 /* AUX channel interface registers */
  94 #define ZYNQMP_DP_AUX_COMMAND                           0x100
  95 #define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT                 8
  96 #define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY              BIT(12)
  97 #define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT               0
  98 #define ZYNQMP_DP_AUX_WRITE_FIFO                        0x104
  99 #define ZYNQMP_DP_AUX_ADDRESS                           0x108
 100 #define ZYNQMP_DP_AUX_CLK_DIVIDER                       0x10c
 101 #define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT      8
 102 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE                0x130
 103 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD            BIT(0)
 104 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST        BIT(1)
 105 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY          BIT(2)
 106 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT  BIT(3)
 107 #define ZYNQMP_DP_AUX_REPLY_DATA                        0x134
 108 #define ZYNQMP_DP_AUX_REPLY_CODE                        0x138
 109 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK                (0)
 110 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK               BIT(0)
 111 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER              BIT(1)
 112 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK                (0)
 113 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK               BIT(2)
 114 #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER              BIT(3)
 115 #define ZYNQMP_DP_AUX_REPLY_COUNT                       0x13c
 116 #define ZYNQMP_DP_REPLY_DATA_COUNT                      0x148
 117 #define ZYNQMP_DP_REPLY_DATA_COUNT_MASK                 0xff
 118 #define ZYNQMP_DP_INT_STATUS                            0x3a0
 119 #define ZYNQMP_DP_INT_MASK                              0x3a4
 120 #define ZYNQMP_DP_INT_EN                                0x3a8
 121 #define ZYNQMP_DP_INT_DS                                0x3ac
 122 #define ZYNQMP_DP_INT_HPD_IRQ                           BIT(0)
 123 #define ZYNQMP_DP_INT_HPD_EVENT                         BIT(1)
 124 #define ZYNQMP_DP_INT_REPLY_RECEIVED                    BIT(2)
 125 #define ZYNQMP_DP_INT_REPLY_TIMEOUT                     BIT(3)
 126 #define ZYNQMP_DP_INT_HPD_PULSE_DET                     BIT(4)
 127 #define ZYNQMP_DP_INT_EXT_PKT_TXD                       BIT(5)
 128 #define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW                  BIT(12)
 129 #define ZYNQMP_DP_INT_VBLANK_START                      BIT(13)
 130 #define ZYNQMP_DP_INT_PIXEL1_MATCH                      BIT(14)
 131 #define ZYNQMP_DP_INT_PIXEL0_MATCH                      BIT(15)
 132 #define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK               0x3f0000
 133 #define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK                0xfc00000
 134 #define ZYNQMP_DP_INT_CUST_TS_2                         BIT(28)
 135 #define ZYNQMP_DP_INT_CUST_TS                           BIT(29)
 136 #define ZYNQMP_DP_INT_EXT_VSYNC_TS                      BIT(30)
 137 #define ZYNQMP_DP_INT_VSYNC_TS                          BIT(31)
 138 #define ZYNQMP_DP_INT_ALL                               (ZYNQMP_DP_INT_HPD_IRQ | \
 139                                                          ZYNQMP_DP_INT_HPD_EVENT | \
 140                                                          ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \
 141                                                          ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
 142
 143 /* Main stream attribute registers */
 144 #define ZYNQMP_DP_MAIN_STREAM_HTOTAL                    0x180
 145 #define ZYNQMP_DP_MAIN_STREAM_VTOTAL                    0x184
 146 #define ZYNQMP_DP_MAIN_STREAM_POLARITY                  0x188
 147 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT      0
 148 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT      1
 149 #define ZYNQMP_DP_MAIN_STREAM_HSWIDTH                   0x18c
 150 #define ZYNQMP_DP_MAIN_STREAM_VSWIDTH                   0x190
 151 #define ZYNQMP_DP_MAIN_STREAM_HRES                      0x194
 152 #define ZYNQMP_DP_MAIN_STREAM_VRES                      0x198
 153 #define ZYNQMP_DP_MAIN_STREAM_HSTART                    0x19c
 154 #define ZYNQMP_DP_MAIN_STREAM_VSTART                    0x1a0
 155 #define ZYNQMP_DP_MAIN_STREAM_MISC0                     0x1a4
 156 #define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK           BIT(0)
 157 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB     (0 << 1)
 158 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422       (5 << 1)
 159 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444       (6 << 1)
 160 #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK    (7 << 1)
 161 #define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE       BIT(3)
 162 #define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR          BIT(4)
 163 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6               (0 << 5)
 164 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8               (1 << 5)
 165 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10              (2 << 5)
 166 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12              (3 << 5)
 167 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16              (4 << 5)
 168 #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK            (7 << 5)
 169 #define ZYNQMP_DP_MAIN_STREAM_MISC1                     0x1a8
 170 #define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN           BIT(7)
 171 #define ZYNQMP_DP_MAIN_STREAM_M_VID                     0x1ac
 172 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE                0x1b0
 173 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF    64
 174 #define ZYNQMP_DP_MAIN_STREAM_N_VID                     0x1b4
 175 #define ZYNQMP_DP_USER_PIX_WIDTH                        0x1b8
 176 #define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE              0x1bc
 177 #define ZYNQMP_DP_MIN_BYTES_PER_TU                      0x1c4
 178 #define ZYNQMP_DP_FRAC_BYTES_PER_TU                     0x1c8
 179 #define ZYNQMP_DP_INIT_WAIT                             0x1cc
 180
 181 /* PHY configuration and status registers */
 182 #define ZYNQMP_DP_PHY_RESET                             0x200
 183 #define ZYNQMP_DP_PHY_RESET_PHY_RESET                   BIT(0)
 184 #define ZYNQMP_DP_PHY_RESET_GTTX_RESET                  BIT(1)
 185 #define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET               BIT(8)
 186 #define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET               BIT(9)
 187 #define ZYNQMP_DP_PHY_RESET_ALL_RESET                   (ZYNQMP_DP_PHY_RESET_PHY_RESET | \
 188                                                          ZYNQMP_DP_PHY_RESET_GTTX_RESET | \
 189                                                          ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \
 190                                                          ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET)
 191 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0                0x210
 192 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1                0x214
 193 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2                0x218
 194 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3                0x21c
 195 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0               0x220
 196 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1               0x224
 197 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2               0x228
 198 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3               0x22c
 199 #define ZYNQMP_DP_PHY_CLOCK_SELECT                      0x234
 200 #define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G                0x1
 201 #define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G                0x3
 202 #define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G                0x5
 203 #define ZYNQMP_DP_TX_PHY_POWER_DOWN                     0x238
 204 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0              BIT(0)
 205 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1              BIT(1)
 206 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2              BIT(2)
 207 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3              BIT(3)
 208 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL                 0xf
 209 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_0                  0x23c
 210 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_1                  0x240
 211 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_2                  0x244
 212 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_3                  0x248
 213 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0                 0x24c
 214 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1                 0x250
 215 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2                 0x254
 216 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3                 0x258
 217 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0           0x24c
 218 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1           0x250
 219 #define ZYNQMP_DP_PHY_STATUS                            0x280
 220 #define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT           4
 221 #define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED            BIT(6)
 222
 223 /* Audio registers */
 224 #define ZYNQMP_DP_TX_AUDIO_CONTROL                      0x300
 225 #define ZYNQMP_DP_TX_AUDIO_CHANNELS                     0x304
 226 #define ZYNQMP_DP_TX_AUDIO_INFO_DATA                    0x308
 227 #define ZYNQMP_DP_TX_M_AUD                              0x328
 228 #define ZYNQMP_DP_TX_N_AUD                              0x32c
 229 #define ZYNQMP_DP_TX_AUDIO_EXT_DATA                     0x330
 230
 231 #define ZYNQMP_DP_MAX_LANES                             2
 232 #define ZYNQMP_MAX_FREQ                                 3000000
 233
 234 #define DP_REDUCED_BIT_RATE                             162000
 235 #define DP_HIGH_BIT_RATE                                270000
 236 #define DP_HIGH_BIT_RATE2                               540000
 237 #define DP_MAX_TRAINING_TRIES                           5
 238 #define DP_V1_2                                         0x12
 239
 240 /**
 241  * struct zynqmp_dp_link_config - Common link config between source and sink
 242  * @max_rate: maximum link rate
 243  * @max_lanes: maximum number of lanes
 244  */
 245 struct zynqmp_dp_link_config {
 246         int max_rate;
 247         u8 max_lanes;
 248 };
 249
 250 /**
 251  * struct zynqmp_dp_mode - Configured mode of DisplayPort
 252  * @bw_code: code for bandwidth(link rate)
 253  * @lane_cnt: number of lanes
 254  * @pclock: pixel clock frequency of current mode
 255  * @fmt: format identifier string
 256  */
 257 struct zynqmp_dp_mode {
 258         u8 bw_code;
 259         u8 lane_cnt;
 260         int pclock;
 261         const char *fmt;
 262 };
 263
 264 /**
 265  * struct zynqmp_dp_config - Configuration of DisplayPort from DTS
 266  * @misc0: misc0 configuration (per DP v1.2 spec)
 267  * @misc1: misc1 configuration (per DP v1.2 spec)
 268  * @bpp: bits per pixel
 269  */
 270 struct zynqmp_dp_config {
 271         u8 misc0;
 272         u8 misc1;
 273         u8 bpp;
 274 };
 275
 276 /**
 277  * struct zynqmp_dp - Xilinx DisplayPort core
 278  * @dev: device structure
 279  * @dpsub: Display subsystem
 280  * @iomem: device I/O memory for register access
 281  * @reset: reset controller
 282  * @irq: irq
 283  * @bridge: DRM bridge for the DP encoder
 284  * @next_bridge: The downstream bridge
 285  * @config: IP core configuration from DTS
 286  * @aux: aux channel
 287  * @phy: PHY handles for DP lanes
 288  * @num_lanes: number of enabled phy lanes
 289  * @hpd_work: hot plug detection worker
 290  * @status: connection status
 291  * @enabled: flag to indicate if the device is enabled
 292  * @dpcd: DP configuration data from currently connected sink device
 293  * @link_config: common link configuration between IP core and sink device
 294  * @mode: current mode between IP core and sink device
 295  * @train_set: set of training data
 296  */
 297 struct zynqmp_dp {
 298         struct device *dev;
 299         struct zynqmp_dpsub *dpsub;
 300         void __iomem *iomem;
 301         struct reset_control *reset;
 302         int irq;
 303
 304         struct drm_bridge bridge;
 305         struct drm_bridge *next_bridge;
 306
 307         struct zynqmp_dp_config config;
 308         struct drm_dp_aux aux;
 309         struct phy *phy[ZYNQMP_DP_MAX_LANES];
 310         u8 num_lanes;
 311         struct delayed_work hpd_work;
 312         enum drm_connector_status status;
 313         bool enabled;
 314
 315         u8 dpcd[DP_RECEIVER_CAP_SIZE];
 316         struct zynqmp_dp_link_config link_config;
 317         struct zynqmp_dp_mode mode;
 318         u8 train_set[ZYNQMP_DP_MAX_LANES];
 319 };
 320
 321 static inline struct zynqmp_dp *bridge_to_dp(struct drm_bridge *bridge)
 322 {
 323         return container_of(bridge, struct zynqmp_dp, bridge);
 324 }
 325
 326 static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val)
 327 {
 328         writel(val, dp->iomem + offset);
 329 }
 330
 331 static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset)
 332 {
 333         return readl(dp->iomem + offset);
 334 }
 335
 336 static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr)
 337 {
 338         zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr);
 339 }
 340
 341 static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set)
 342 {
 343         zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set);
 344 }
 345
 346 /* -----------------------------------------------------------------------------
 347  * PHY Handling
 348  */
 349
 350 #define RST_TIMEOUT_MS                  1000
 351
 352 static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert)
 353 {
 354         unsigned long timeout;
 355
 356         if (assert)
 357                 reset_control_assert(dp->reset);
 358         else
 359                 reset_control_deassert(dp->reset);
 360
 361         /* Wait for the (de)assert to complete. */
 362         timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS);
 363         while (!time_after_eq(jiffies, timeout)) {
 364                 bool status = !!reset_control_status(dp->reset);
 365
 366                 if (assert == status)
 367                         return 0;
 368
 369                 cpu_relax();
 370         }
 371
 372         dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert");
 373         return -ETIMEDOUT;
 374 }
 375
 376 /**
 377  * zynqmp_dp_phy_init - Initialize the phy
 378  * @dp: DisplayPort IP core structure
 379  *
 380  * Initialize the phy.
 381  *
 382  * Return: 0 if the phy instances are initialized correctly, or the error code
 383  * returned from the callee functions.
 384  */
 385 static int zynqmp_dp_phy_init(struct zynqmp_dp *dp)
 386 {
 387         int ret;
 388         int i;
 389
 390         for (i = 0; i < dp->num_lanes; i++) {
 391                 ret = phy_init(dp->phy[i]);
 392                 if (ret) {
 393                         dev_err(dp->dev, "failed to init phy lane %d\n", i);
 394                         return ret;
 395                 }
 396         }
 397
 398         zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
 399
 400         /*
 401          * Power on lanes in reverse order as only lane 0 waits for the PLL to
 402          * lock.
 403          */
 404         for (i = dp->num_lanes - 1; i >= 0; i--) {
 405                 ret = phy_power_on(dp->phy[i]);
 406                 if (ret) {
 407                         dev_err(dp->dev, "failed to power on phy lane %d\n", i);
 408                         return ret;
 409                 }
 410         }
 411
 412         return 0;
 413 }
 414
 415 /**
 416  * zynqmp_dp_phy_exit - Exit the phy
 417  * @dp: DisplayPort IP core structure
 418  *
 419  * Exit the phy.
 420  */
 421 static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp)
 422 {
 423         unsigned int i;
 424         int ret;
 425
 426         for (i = 0; i < dp->num_lanes; i++) {
 427                 ret = phy_power_off(dp->phy[i]);
 428                 if (ret)
 429                         dev_err(dp->dev, "failed to power off phy(%d) %d\n", i,
 430                                 ret);
 431         }
 432
 433         for (i = 0; i < dp->num_lanes; i++) {
 434                 ret = phy_exit(dp->phy[i]);
 435                 if (ret)
 436                         dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret);
 437         }
 438 }
 439
 440 /**
 441  * zynqmp_dp_phy_probe - Probe the PHYs
 442  * @dp: DisplayPort IP core structure
 443  *
 444  * Probe PHYs for all lanes. Less PHYs may be available than the number of
 445  * lanes, which is not considered an error as long as at least one PHY is
 446  * found. The caller can check dp->num_lanes to check how many PHYs were found.
 447  *
 448  * Return:
 449  * * 0                          - Success
 450  * * -ENXIO                     - No PHY found
 451  * * -EPROBE_DEFER              - Probe deferral requested
 452  * * Other negative value       - PHY retrieval failure
 453  */
 454 static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp)
 455 {
 456         unsigned int i;
 457
 458         for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) {
 459                 char phy_name[16];
 460                 struct phy *phy;
 461
 462                 snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i);
 463                 phy = devm_phy_get(dp->dev, phy_name);
 464
 465                 if (IS_ERR(phy)) {
 466                         switch (PTR_ERR(phy)) {
 467                         case -ENODEV:
 468                                 if (dp->num_lanes)
 469                                         return 0;
 470
 471                                 dev_err(dp->dev, "no PHY found\n");
 472                                 return -ENXIO;
 473
 474                         case -EPROBE_DEFER:
 475                                 return -EPROBE_DEFER;
 476
 477                         default:
 478                                 dev_err(dp->dev, "failed to get PHY lane %u\n",
 479                                         i);
 480                                 return PTR_ERR(phy);
 481                         }
 482                 }
 483
 484                 dp->phy[i] = phy;
 485                 dp->num_lanes++;
 486         }
 487
 488         return 0;
 489 }
 490
 491 /**
 492  * zynqmp_dp_phy_ready - Check if PHY is ready
 493  * @dp: DisplayPort IP core structure
 494  *
 495  * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times.
 496  * This amount of delay was suggested by IP designer.
 497  *
 498  * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready.
 499  */
 500 static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp)
 501 {
 502         u32 i, reg, ready;
 503
 504         ready = (1 << dp->num_lanes) - 1;
 505
 506         /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */
 507         for (i = 0; ; i++) {
 508                 reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS);
 509                 if ((reg & ready) == ready)
 510                         return 0;
 511
 512                 if (i == 100) {
 513                         dev_err(dp->dev, "PHY isn't ready\n");
 514                         return -ENODEV;
 515                 }
 516
 517                 usleep_range(1000, 1100);
 518         }
 519
 520         return 0;
 521 }
 522
 523 /* -----------------------------------------------------------------------------
 524  * DisplayPort Link Training
 525  */
 526
 527 /**
 528  * zynqmp_dp_max_rate - Calculate and return available max pixel clock
 529  * @link_rate: link rate (Kilo-bytes / sec)
 530  * @lane_num: number of lanes
 531  * @bpp: bits per pixel
 532  *
 533  * Return: max pixel clock (KHz) supported by current link config.
 534  */
 535 static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp)
 536 {
 537         return link_rate * lane_num * 8 / bpp;
 538 }
 539
 540 /**
 541  * zynqmp_dp_mode_configure - Configure the link values
 542  * @dp: DisplayPort IP core structure
 543  * @pclock: pixel clock for requested display mode
 544  * @current_bw: current link rate
 545  *
 546  * Find the link configuration values, rate and lane count for requested pixel
 547  * clock @pclock. The @pclock is stored in the mode to be used in other
 548  * functions later. The returned rate is downshifted from the current rate
 549  * @current_bw.
 550  *
 551  * Return: Current link rate code, or -EINVAL.
 552  */
 553 static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock,
 554                                     u8 current_bw)
 555 {
 556         int max_rate = dp->link_config.max_rate;
 557         u8 bw_code;
 558         u8 max_lanes = dp->link_config.max_lanes;
 559         u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate);
 560         u8 bpp = dp->config.bpp;
 561         u8 lane_cnt;
 562
 563         /* Downshift from current bandwidth */
 564         switch (current_bw) {
 565         case DP_LINK_BW_5_4:
 566                 bw_code = DP_LINK_BW_2_7;
 567                 break;
 568         case DP_LINK_BW_2_7:
 569                 bw_code = DP_LINK_BW_1_62;
 570                 break;
 571         case DP_LINK_BW_1_62:
 572                 dev_err(dp->dev, "can't downshift. already lowest link rate\n");
 573                 return -EINVAL;
 574         default:
 575                 /* If not given, start with max supported */
 576                 bw_code = max_link_rate_code;
 577                 break;
 578         }
 579
 580         for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) {
 581                 int bw;
 582                 u32 rate;
 583
 584                 bw = drm_dp_bw_code_to_link_rate(bw_code);
 585                 rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp);
 586                 if (pclock <= rate) {
 587                         dp->mode.bw_code = bw_code;
 588                         dp->mode.lane_cnt = lane_cnt;
 589                         dp->mode.pclock = pclock;
 590                         return dp->mode.bw_code;
 591                 }
 592         }
 593
 594         dev_err(dp->dev, "failed to configure link values\n");
 595
 596         return -EINVAL;
 597 }
 598
 599 /**
 600  * zynqmp_dp_adjust_train - Adjust train values
 601  * @dp: DisplayPort IP core structure
 602  * @link_status: link status from sink which contains requested training values
 603  */
 604 static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp,
 605                                    u8 link_status[DP_LINK_STATUS_SIZE])
 606 {
 607         u8 *train_set = dp->train_set;
 608         u8 voltage = 0, preemphasis = 0;
 609         u8 i;
 610
 611         for (i = 0; i < dp->mode.lane_cnt; i++) {
 612                 u8 v = drm_dp_get_adjust_request_voltage(link_status, i);
 613                 u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i);
 614
 615                 if (v > voltage)
 616                         voltage = v;
 617
 618                 if (p > preemphasis)
 619                         preemphasis = p;
 620         }
 621
 622         if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3)
 623                 voltage |= DP_TRAIN_MAX_SWING_REACHED;
 624
 625         if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2)
 626                 preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 627
 628         for (i = 0; i < dp->mode.lane_cnt; i++)
 629                 train_set[i] = voltage | preemphasis;
 630 }
 631
 632 /**
 633  * zynqmp_dp_update_vs_emph - Update the training values
 634  * @dp: DisplayPort IP core structure
 635  *
 636  * Update the training values based on the request from sink. The mapped values
 637  * are predefined, and values(vs, pe, pc) are from the device manual.
 638  *
 639  * Return: 0 if vs and emph are updated successfully, or the error code returned
 640  * by drm_dp_dpcd_write().
 641  */
 642 static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp)
 643 {
 644         unsigned int i;
 645         int ret;
 646
 647         ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->train_set,
 648                                 dp->mode.lane_cnt);
 649         if (ret < 0)
 650                 return ret;
 651
 652         for (i = 0; i < dp->mode.lane_cnt; i++) {
 653                 u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4;
 654                 union phy_configure_opts opts = { 0 };
 655                 u8 train = dp->train_set[i];
 656
 657                 opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK)
 658                                    >> DP_TRAIN_VOLTAGE_SWING_SHIFT;
 659                 opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK)
 660                                >> DP_TRAIN_PRE_EMPHASIS_SHIFT;
 661
 662                 phy_configure(dp->phy[i], &opts);
 663
 664                 zynqmp_dp_write(dp, reg, 0x2);
 665         }
 666
 667         return 0;
 668 }
 669
 670 /**
 671  * zynqmp_dp_link_train_cr - Train clock recovery
 672  * @dp: DisplayPort IP core structure
 673  *
 674  * Return: 0 if clock recovery train is done successfully, or corresponding
 675  * error code.
 676  */
 677 static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp)
 678 {
 679         u8 link_status[DP_LINK_STATUS_SIZE];
 680         u8 lane_cnt = dp->mode.lane_cnt;
 681         u8 vs = 0, tries = 0;
 682         u16 max_tries, i;
 683         bool cr_done;
 684         int ret;
 685
 686         zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
 687                         DP_TRAINING_PATTERN_1);
 688         ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 689                                  DP_TRAINING_PATTERN_1 |
 690                                  DP_LINK_SCRAMBLING_DISABLE);
 691         if (ret < 0)
 692                 return ret;
 693
 694         /*
 695          * 256 loops should be maximum iterations for 4 lanes and 4 values.
 696          * So, This loop should exit before 512 iterations
 697          */
 698         for (max_tries = 0; max_tries < 512; max_tries++) {
 699                 ret = zynqmp_dp_update_vs_emph(dp);
 700                 if (ret)
 701                         return ret;
 702
 703                 drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd);
 704                 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
 705                 if (ret < 0)
 706                         return ret;
 707
 708                 cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt);
 709                 if (cr_done)
 710                         break;
 711
 712                 for (i = 0; i < lane_cnt; i++)
 713                         if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED))
 714                                 break;
 715                 if (i == lane_cnt)
 716                         break;
 717
 718                 if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs)
 719                         tries++;
 720                 else
 721                         tries = 0;
 722
 723                 if (tries == DP_MAX_TRAINING_TRIES)
 724                         break;
 725
 726                 vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
 727                 zynqmp_dp_adjust_train(dp, link_status);
 728         }
 729
 730         if (!cr_done)
 731                 return -EIO;
 732
 733         return 0;
 734 }
 735
 736 /**
 737  * zynqmp_dp_link_train_ce - Train channel equalization
 738  * @dp: DisplayPort IP core structure
 739  *
 740  * Return: 0 if channel equalization train is done successfully, or
 741  * corresponding error code.
 742  */
 743 static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp)
 744 {
 745         u8 link_status[DP_LINK_STATUS_SIZE];
 746         u8 lane_cnt = dp->mode.lane_cnt;
 747         u32 pat, tries;
 748         int ret;
 749         bool ce_done;
 750
 751         if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 &&
 752             dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED)
 753                 pat = DP_TRAINING_PATTERN_3;
 754         else
 755                 pat = DP_TRAINING_PATTERN_2;
 756
 757         zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat);
 758         ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 759                                  pat | DP_LINK_SCRAMBLING_DISABLE);
 760         if (ret < 0)
 761                 return ret;
 762
 763         for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) {
 764                 ret = zynqmp_dp_update_vs_emph(dp);
 765                 if (ret)
 766                         return ret;
 767
 768                 drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd);
 769                 ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status);
 770                 if (ret < 0)
 771                         return ret;
 772
 773                 ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt);
 774                 if (ce_done)
 775                         break;
 776
 777                 zynqmp_dp_adjust_train(dp, link_status);
 778         }
 779
 780         if (!ce_done)
 781                 return -EIO;
 782
 783         return 0;
 784 }
 785
 786 /**
 787  * zynqmp_dp_train - Train the link
 788  * @dp: DisplayPort IP core structure
 789  *
 790  * Return: 0 if all trains are done successfully, or corresponding error code.
 791  */
 792 static int zynqmp_dp_train(struct zynqmp_dp *dp)
 793 {
 794         u32 reg;
 795         u8 bw_code = dp->mode.bw_code;
 796         u8 lane_cnt = dp->mode.lane_cnt;
 797         u8 aux_lane_cnt = lane_cnt;
 798         bool enhanced;
 799         int ret;
 800
 801         zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt);
 802         enhanced = drm_dp_enhanced_frame_cap(dp->dpcd);
 803         if (enhanced) {
 804                 zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1);
 805                 aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 806         }
 807
 808         if (dp->dpcd[3] & 0x1) {
 809                 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1);
 810                 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL,
 811                                    DP_SPREAD_AMP_0_5);
 812         } else {
 813                 zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0);
 814                 drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0);
 815         }
 816
 817         ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt);
 818         if (ret < 0) {
 819                 dev_err(dp->dev, "failed to set lane count\n");
 820                 return ret;
 821         }
 822
 823         ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET,
 824                                  DP_SET_ANSI_8B10B);
 825         if (ret < 0) {
 826                 dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n");
 827                 return ret;
 828         }
 829
 830         ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code);
 831         if (ret < 0) {
 832                 dev_err(dp->dev, "failed to set DP bandwidth\n");
 833                 return ret;
 834         }
 835
 836         zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code);
 837         switch (bw_code) {
 838         case DP_LINK_BW_1_62:
 839                 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G;
 840                 break;
 841         case DP_LINK_BW_2_7:
 842                 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G;
 843                 break;
 844         case DP_LINK_BW_5_4:
 845         default:
 846                 reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G;
 847                 break;
 848         }
 849
 850         zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg);
 851         ret = zynqmp_dp_phy_ready(dp);
 852         if (ret < 0)
 853                 return ret;
 854
 855         zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
 856         memset(dp->train_set, 0, sizeof(dp->train_set));
 857         ret = zynqmp_dp_link_train_cr(dp);
 858         if (ret)
 859                 return ret;
 860
 861         ret = zynqmp_dp_link_train_ce(dp);
 862         if (ret)
 863                 return ret;
 864
 865         ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET,
 866                                  DP_TRAINING_PATTERN_DISABLE);
 867         if (ret < 0) {
 868                 dev_err(dp->dev, "failed to disable training pattern\n");
 869                 return ret;
 870         }
 871         zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET,
 872                         DP_TRAINING_PATTERN_DISABLE);
 873
 874         zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0);
 875
 876         return 0;
 877 }
 878
 879 /**
 880  * zynqmp_dp_train_loop - Downshift the link rate during training
 881  * @dp: DisplayPort IP core structure
 882  *
 883  * Train the link by downshifting the link rate if training is not successful.
 884  */
 885 static void zynqmp_dp_train_loop(struct zynqmp_dp *dp)
 886 {
 887         struct zynqmp_dp_mode *mode = &dp->mode;
 888         u8 bw = mode->bw_code;
 889         int ret;
 890
 891         do {
 892                 if (dp->status == connector_status_disconnected ||
 893                     !dp->enabled)
 894                         return;
 895
 896                 ret = zynqmp_dp_train(dp);
 897                 if (!ret)
 898                         return;
 899
 900                 ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw);
 901                 if (ret < 0)
 902                         goto err_out;
 903
 904                 bw = ret;
 905         } while (bw >= DP_LINK_BW_1_62);
 906
 907 err_out:
 908         dev_err(dp->dev, "failed to train the DP link\n");
 909 }
 910
 911 /* -----------------------------------------------------------------------------
 912  * DisplayPort AUX
 913  */
 914
 915 #define AUX_READ_BIT    0x1
 916
 917 /**
 918  * zynqmp_dp_aux_cmd_submit - Submit aux command
 919  * @dp: DisplayPort IP core structure
 920  * @cmd: aux command
 921  * @addr: aux address
 922  * @buf: buffer for command data
 923  * @bytes: number of bytes for @buf
 924  * @reply: reply code to be returned
 925  *
 926  * Submit an aux command. All aux related commands, native or i2c aux
 927  * read/write, are submitted through this function. The function is mapped to
 928  * the transfer function of struct drm_dp_aux. This function involves in
 929  * multiple register reads/writes, thus synchronization is needed, and it is
 930  * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep
 931  * if there's no immediate reply to the command submission. The reply code is
 932  * returned at @reply if @reply != NULL.
 933  *
 934  * Return: 0 if the command is submitted properly, or corresponding error code:
 935  * -EBUSY when there is any request already being processed
 936  * -ETIMEDOUT when receiving reply is timed out
 937  * -EIO when received bytes are less than requested
 938  */
 939 static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr,
 940                                     u8 *buf, u8 bytes, u8 *reply)
 941 {
 942         bool is_read = (cmd & AUX_READ_BIT) ? true : false;
 943         u32 reg, i;
 944
 945         reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
 946         if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST)
 947                 return -EBUSY;
 948
 949         zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr);
 950         if (!is_read)
 951                 for (i = 0; i < bytes; i++)
 952                         zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO,
 953                                         buf[i]);
 954
 955         reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT;
 956         if (!buf || !bytes)
 957                 reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY;
 958         else
 959                 reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT;
 960         zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg);
 961
 962         /* Wait for reply to be delivered upto 2ms */
 963         for (i = 0; ; i++) {
 964                 reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
 965                 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY)
 966                         break;
 967
 968                 if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT ||
 969                     i == 2)
 970                         return -ETIMEDOUT;
 971
 972                 usleep_range(1000, 1100);
 973         }
 974
 975         reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE);
 976         if (reply)
 977                 *reply = reg;
 978
 979         if (is_read &&
 980             (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK ||
 981              reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) {
 982                 reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT);
 983                 if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes)
 984                         return -EIO;
 985
 986                 for (i = 0; i < bytes; i++)
 987                         buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA);
 988         }
 989
 990         return 0;
 991 }
 992
 993 static ssize_t
 994 zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
 995 {
 996         struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux);
 997         int ret;
 998         unsigned int i, iter;
 999
1000         /* Number of loops = timeout in msec / aux delay (400 usec) */
1001         iter = zynqmp_dp_aux_timeout_ms * 1000 / 400;
1002         iter = iter ? iter : 1;
1003
1004         for (i = 0; i < iter; i++) {
1005                 ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address,
1006                                                msg->buffer, msg->size,
1007                                                &msg->reply);
1008                 if (!ret) {
1009                         dev_dbg(dp->dev, "aux %d retries\n", i);
1010                         return msg->size;
1011                 }
1012
1013                 if (dp->status == connector_status_disconnected) {
1014                         dev_dbg(dp->dev, "no connected aux device\n");
1015                         return -ENODEV;
1016                 }
1017
1018                 usleep_range(400, 500);
1019         }
1020
1021         dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret);
1022
1023         return ret;
1024 }
1025
1026 /**
1027  * zynqmp_dp_aux_init - Initialize and register the DP AUX
1028  * @dp: DisplayPort IP core structure
1029  *
1030  * Program the AUX clock divider and filter and register the DP AUX adapter.
1031  *
1032  * Return: 0 on success, error value otherwise
1033  */
1034 static int zynqmp_dp_aux_init(struct zynqmp_dp *dp)
1035 {
1036         unsigned long rate;
1037         unsigned int w;
1038
1039         /*
1040          * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles
1041          * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32,
1042          * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs,
1043          * compute the w / 8 value corresponding to 0.4µs rounded up, and make
1044          * sure it stays below 0.6µs and within the allowable values.
1045          */
1046         rate = clk_get_rate(dp->dpsub->apb_clk);
1047         w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8;
1048         if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) {
1049                 dev_err(dp->dev, "aclk frequency too high\n");
1050                 return -EINVAL;
1051         }
1052
1053         zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER,
1054                         (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) |
1055                         (rate / (1000 * 1000)));
1056
1057         dp->aux.name = "ZynqMP DP AUX";
1058         dp->aux.dev = dp->dev;
1059         dp->aux.drm_dev = dp->bridge.dev;
1060         dp->aux.transfer = zynqmp_dp_aux_transfer;
1061
1062         return drm_dp_aux_register(&dp->aux);
1063 }
1064
1065 /**
1066  * zynqmp_dp_aux_cleanup - Cleanup the DP AUX
1067  * @dp: DisplayPort IP core structure
1068  *
1069  * Unregister the DP AUX adapter.
1070  */
1071 static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp)
1072 {
1073         drm_dp_aux_unregister(&dp->aux);
1074 }
1075
1076 /* -----------------------------------------------------------------------------
1077  * DisplayPort Generic Support
1078  */
1079
1080 /**
1081  * zynqmp_dp_update_misc - Write the misc registers
1082  * @dp: DisplayPort IP core structure
1083  *
1084  * The misc register values are stored in the structure, and this
1085  * function applies the values into the registers.
1086  */
1087 static void zynqmp_dp_update_misc(struct zynqmp_dp *dp)
1088 {
1089         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0);
1090         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1);
1091 }
1092
1093 /**
1094  * zynqmp_dp_set_format - Set the input format
1095  * @dp: DisplayPort IP core structure
1096  * @info: Display info
1097  * @format: input format
1098  * @bpc: bits per component
1099  *
1100  * Update misc register values based on input @format and @bpc.
1101  *
1102  * Return: 0 on success, or -EINVAL.
1103  */
1104 static int zynqmp_dp_set_format(struct zynqmp_dp *dp,
1105                                 const struct drm_display_info *info,
1106                                 enum zynqmp_dpsub_format format,
1107                                 unsigned int bpc)
1108 {
1109         struct zynqmp_dp_config *config = &dp->config;
1110         unsigned int num_colors;
1111
1112         config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK;
1113         config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
1114
1115         switch (format) {
1116         case ZYNQMP_DPSUB_FORMAT_RGB:
1117                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB;
1118                 num_colors = 3;
1119                 break;
1120
1121         case ZYNQMP_DPSUB_FORMAT_YCRCB444:
1122                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444;
1123                 num_colors = 3;
1124                 break;
1125
1126         case ZYNQMP_DPSUB_FORMAT_YCRCB422:
1127                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422;
1128                 num_colors = 2;
1129                 break;
1130
1131         case ZYNQMP_DPSUB_FORMAT_YONLY:
1132                 config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN;
1133                 num_colors = 1;
1134                 break;
1135
1136         default:
1137                 dev_err(dp->dev, "Invalid colormetry in DT\n");
1138                 return -EINVAL;
1139         }
1140
1141         if (info && info->bpc && bpc > info->bpc) {
1142                 dev_warn(dp->dev,
1143                          "downgrading requested %ubpc to display limit %ubpc\n",
1144                          bpc, info->bpc);
1145                 bpc = info->bpc;
1146         }
1147
1148         config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK;
1149
1150         switch (bpc) {
1151         case 6:
1152                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6;
1153                 break;
1154         case 8:
1155                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
1156                 break;
1157         case 10:
1158                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10;
1159                 break;
1160         case 12:
1161                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12;
1162                 break;
1163         case 16:
1164                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16;
1165                 break;
1166         default:
1167                 dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n",
1168                          bpc);
1169                 config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8;
1170                 bpc = 8;
1171                 break;
1172         }
1173
1174         /* Update the current bpp based on the format. */
1175         config->bpp = bpc * num_colors;
1176
1177         return 0;
1178 }
1179
1180 /**
1181  * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values
1182  * @dp: DisplayPort IP core structure
1183  * @mode: requested display mode
1184  *
1185  * Set the transfer unit, and calculate all transfer unit size related values.
1186  * Calculation is based on DP and IP core specification.
1187  */
1188 static void
1189 zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp,
1190                                          const struct drm_display_mode *mode)
1191 {
1192         u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF;
1193         u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait;
1194
1195         /* Use the max transfer unit size (default) */
1196         zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu);
1197
1198         vid_kbytes = mode->clock * (dp->config.bpp / 8);
1199         bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
1200         avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000);
1201         zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU,
1202                         avg_bytes_per_tu / 1000);
1203         zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU,
1204                         avg_bytes_per_tu % 1000);
1205
1206         /* Configure the initial wait cycle based on transfer unit size */
1207         if (tu < (avg_bytes_per_tu / 1000))
1208                 init_wait = 0;
1209         else if ((avg_bytes_per_tu / 1000) <= 4)
1210                 init_wait = tu;
1211         else
1212                 init_wait = tu - avg_bytes_per_tu / 1000;
1213
1214         zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait);
1215 }
1216
1217 /**
1218  * zynqmp_dp_encoder_mode_set_stream - Configure the main stream
1219  * @dp: DisplayPort IP core structure
1220  * @mode: requested display mode
1221  *
1222  * Configure the main stream based on the requested mode @mode. Calculation is
1223  * based on IP core specification.
1224  */
1225 static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp,
1226                                               const struct drm_display_mode *mode)
1227 {
1228         u8 lane_cnt = dp->mode.lane_cnt;
1229         u32 reg, wpl;
1230         unsigned int rate;
1231
1232         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal);
1233         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal);
1234         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY,
1235                         (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) <<
1236                          ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) |
1237                         (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) <<
1238                          ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT));
1239         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH,
1240                         mode->hsync_end - mode->hsync_start);
1241         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH,
1242                         mode->vsync_end - mode->vsync_start);
1243         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay);
1244         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay);
1245         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART,
1246                         mode->htotal - mode->hsync_start);
1247         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART,
1248                         mode->vtotal - mode->vsync_start);
1249
1250         /* In synchronous mode, set the dividers */
1251         if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) {
1252                 reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code);
1253                 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg);
1254                 zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock);
1255                 rate = zynqmp_dpsub_get_audio_clk_rate(dp->dpsub);
1256                 if (rate) {
1257                         dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512);
1258                         zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg);
1259                         zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000);
1260                 }
1261         }
1262
1263         /* Only 2 channel audio is supported now */
1264         if (zynqmp_dpsub_audio_enabled(dp->dpsub))
1265                 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1);
1266
1267         zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1);
1268
1269         /* Translate to the native 16 bit datapath based on IP core spec */
1270         wpl = (mode->hdisplay * dp->config.bpp + 15) / 16;
1271         reg = wpl + wpl % lane_cnt - lane_cnt;
1272         zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg);
1273 }
1274
1275 /* -----------------------------------------------------------------------------
1276  * DISP Configuration
1277  */
1278
1279 static void zynqmp_dp_disp_enable(struct zynqmp_dp *dp,
1280                                   struct drm_bridge_state *old_bridge_state)
1281 {
1282         enum zynqmp_dpsub_layer_id layer_id;
1283         struct zynqmp_disp_layer *layer;
1284         const struct drm_format_info *info;
1285
1286         if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
1287                 layer_id = ZYNQMP_DPSUB_LAYER_VID;
1288         else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
1289                 layer_id = ZYNQMP_DPSUB_LAYER_GFX;
1290         else
1291                 return;
1292
1293         layer = dp->dpsub->layers[layer_id];
1294
1295         /* TODO: Make the format configurable. */
1296         info = drm_format_info(DRM_FORMAT_YUV422);
1297         zynqmp_disp_layer_set_format(layer, info);
1298         zynqmp_disp_layer_enable(layer, ZYNQMP_DPSUB_LAYER_LIVE);
1299
1300         if (layer_id == ZYNQMP_DPSUB_LAYER_GFX)
1301                 zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, true, 255);
1302         else
1303                 zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, false, 0);
1304
1305         zynqmp_disp_enable(dp->dpsub->disp);
1306 }
1307
1308 static void zynqmp_dp_disp_disable(struct zynqmp_dp *dp,
1309                                    struct drm_bridge_state *old_bridge_state)
1310 {
1311         struct zynqmp_disp_layer *layer;
1312
1313         if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO))
1314                 layer = dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_VID];
1315         else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))
1316                 layer = dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX];
1317         else
1318                 return;
1319
1320         zynqmp_disp_disable(dp->dpsub->disp);
1321         zynqmp_disp_layer_disable(layer);
1322 }
1323
1324 /* -----------------------------------------------------------------------------
1325  * DRM Bridge
1326  */
1327
1328 static int zynqmp_dp_bridge_attach(struct drm_bridge *bridge,
1329                                    enum drm_bridge_attach_flags flags)
1330 {
1331         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1332         int ret;
1333
1334         /* Initialize and register the AUX adapter. */
1335         ret = zynqmp_dp_aux_init(dp);
1336         if (ret) {
1337                 dev_err(dp->dev, "failed to initialize DP aux\n");
1338                 return ret;
1339         }
1340
1341         if (dp->next_bridge) {
1342                 ret = drm_bridge_attach(bridge->encoder, dp->next_bridge,
1343                                         bridge, flags);
1344                 if (ret < 0)
1345                         goto error;
1346         }
1347
1348         /* Now that initialisation is complete, enable interrupts. */
1349         zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL);
1350
1351         return 0;
1352
1353 error:
1354         zynqmp_dp_aux_cleanup(dp);
1355         return ret;
1356 }
1357
1358 static void zynqmp_dp_bridge_detach(struct drm_bridge *bridge)
1359 {
1360         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1361
1362         zynqmp_dp_aux_cleanup(dp);
1363 }
1364
1365 static enum drm_mode_status
1366 zynqmp_dp_bridge_mode_valid(struct drm_bridge *bridge,
1367                             const struct drm_display_info *info,
1368                             const struct drm_display_mode *mode)
1369 {
1370         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1371         int rate;
1372
1373         if (mode->clock > ZYNQMP_MAX_FREQ) {
1374                 dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n",
1375                         mode->name);
1376                 drm_mode_debug_printmodeline(mode);
1377                 return MODE_CLOCK_HIGH;
1378         }
1379
1380         /* Check with link rate and lane count */
1381         rate = zynqmp_dp_max_rate(dp->link_config.max_rate,
1382                                   dp->link_config.max_lanes, dp->config.bpp);
1383         if (mode->clock > rate) {
1384                 dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n",
1385                         mode->name);
1386                 drm_mode_debug_printmodeline(mode);
1387                 return MODE_CLOCK_HIGH;
1388         }
1389
1390         return MODE_OK;
1391 }
1392
1393 static void zynqmp_dp_bridge_atomic_enable(struct drm_bridge *bridge,
1394                                            struct drm_bridge_state *old_bridge_state)
1395 {
1396         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1397         struct drm_atomic_state *state = old_bridge_state->base.state;
1398         const struct drm_crtc_state *crtc_state;
1399         const struct drm_display_mode *adjusted_mode;
1400         const struct drm_display_mode *mode;
1401         struct drm_connector *connector;
1402         struct drm_crtc *crtc;
1403         unsigned int i;
1404         int rate;
1405         int ret;
1406
1407         pm_runtime_get_sync(dp->dev);
1408
1409         zynqmp_dp_disp_enable(dp, old_bridge_state);
1410
1411         /*
1412          * Retrieve the CRTC mode and adjusted mode. This requires a little
1413          * dance to go from the bridge to the encoder, to the connector and to
1414          * the CRTC.
1415          */
1416         connector = drm_atomic_get_new_connector_for_encoder(state,
1417                                                              bridge->encoder);
1418         crtc = drm_atomic_get_new_connector_state(state, connector)->crtc;
1419         crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
1420         adjusted_mode = &crtc_state->adjusted_mode;
1421         mode = &crtc_state->mode;
1422
1423         zynqmp_dp_set_format(dp, &connector->display_info,
1424                              ZYNQMP_DPSUB_FORMAT_RGB, 8);
1425
1426         /* Check again as bpp or format might have been changed */
1427         rate = zynqmp_dp_max_rate(dp->link_config.max_rate,
1428                                   dp->link_config.max_lanes, dp->config.bpp);
1429         if (mode->clock > rate) {
1430                 dev_err(dp->dev, "mode %s has too high pixel rate\n",
1431                         mode->name);
1432                 drm_mode_debug_printmodeline(mode);
1433         }
1434
1435         /* Configure the mode */
1436         ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0);
1437         if (ret < 0) {
1438                 pm_runtime_put_sync(dp->dev);
1439                 return;
1440         }
1441
1442         zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode);
1443         zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode);
1444
1445         /* Enable the encoder */
1446         dp->enabled = true;
1447         zynqmp_dp_update_misc(dp);
1448         if (zynqmp_dpsub_audio_enabled(dp->dpsub))
1449                 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1);
1450         zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0);
1451         if (dp->status == connector_status_connected) {
1452                 for (i = 0; i < 3; i++) {
1453                         ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER,
1454                                                  DP_SET_POWER_D0);
1455                         if (ret == 1)
1456                                 break;
1457                         usleep_range(300, 500);
1458                 }
1459                 /* Some monitors take time to wake up properly */
1460                 msleep(zynqmp_dp_power_on_delay_ms);
1461         }
1462         if (ret != 1)
1463                 dev_dbg(dp->dev, "DP aux failed\n");
1464         else
1465                 zynqmp_dp_train_loop(dp);
1466         zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET,
1467                         ZYNQMP_DP_SOFTWARE_RESET_ALL);
1468         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1);
1469 }
1470
1471 static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge,
1472                                             struct drm_bridge_state *old_bridge_state)
1473 {
1474         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1475
1476         dp->enabled = false;
1477         cancel_delayed_work(&dp->hpd_work);
1478         zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0);
1479         drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
1480         zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
1481                         ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
1482         if (zynqmp_dpsub_audio_enabled(dp->dpsub))
1483                 zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0);
1484
1485         zynqmp_dp_disp_disable(dp, old_bridge_state);
1486
1487         pm_runtime_put_sync(dp->dev);
1488 }
1489
1490 #define ZYNQMP_DP_MIN_H_BACKPORCH       20
1491
1492 static int zynqmp_dp_bridge_atomic_check(struct drm_bridge *bridge,
1493                                          struct drm_bridge_state *bridge_state,
1494                                          struct drm_crtc_state *crtc_state,
1495                                          struct drm_connector_state *conn_state)
1496 {
1497         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1498         struct drm_display_mode *mode = &crtc_state->mode;
1499         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
1500         int diff = mode->htotal - mode->hsync_end;
1501
1502         /*
1503          * ZynqMP DP requires horizontal backporch to be greater than 12.
1504          * This limitation may not be compatible with the sink device.
1505          */
1506         if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) {
1507                 int vrefresh = (adjusted_mode->clock * 1000) /
1508                                (adjusted_mode->vtotal * adjusted_mode->htotal);
1509
1510                 dev_dbg(dp->dev, "hbackporch adjusted: %d to %d",
1511                         diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff);
1512                 diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff;
1513                 adjusted_mode->htotal += diff;
1514                 adjusted_mode->clock = adjusted_mode->vtotal *
1515                                        adjusted_mode->htotal * vrefresh / 1000;
1516         }
1517
1518         return 0;
1519 }
1520
1521 static enum drm_connector_status zynqmp_dp_bridge_detect(struct drm_bridge *bridge)
1522 {
1523         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1524         struct zynqmp_dp_link_config *link_config = &dp->link_config;
1525         u32 state, i;
1526         int ret;
1527
1528         /*
1529          * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to
1530          * get the HPD signal with some monitors.
1531          */
1532         for (i = 0; i < 10; i++) {
1533                 state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE);
1534                 if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD)
1535                         break;
1536                 msleep(100);
1537         }
1538
1539         if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) {
1540                 ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd,
1541                                        sizeof(dp->dpcd));
1542                 if (ret < 0) {
1543                         dev_dbg(dp->dev, "DPCD read failed");
1544                         goto disconnected;
1545                 }
1546
1547                 link_config->max_rate = min_t(int,
1548                                               drm_dp_max_link_rate(dp->dpcd),
1549                                               DP_HIGH_BIT_RATE2);
1550                 link_config->max_lanes = min_t(u8,
1551                                                drm_dp_max_lane_count(dp->dpcd),
1552                                                dp->num_lanes);
1553
1554                 dp->status = connector_status_connected;
1555                 return connector_status_connected;
1556         }
1557
1558 disconnected:
1559         dp->status = connector_status_disconnected;
1560         return connector_status_disconnected;
1561 }
1562
1563 static struct edid *zynqmp_dp_bridge_get_edid(struct drm_bridge *bridge,
1564                                               struct drm_connector *connector)
1565 {
1566         struct zynqmp_dp *dp = bridge_to_dp(bridge);
1567
1568         return drm_get_edid(connector, &dp->aux.ddc);
1569 }
1570
1571 static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = {
1572         .attach = zynqmp_dp_bridge_attach,
1573         .detach = zynqmp_dp_bridge_detach,
1574         .mode_valid = zynqmp_dp_bridge_mode_valid,
1575         .atomic_enable = zynqmp_dp_bridge_atomic_enable,
1576         .atomic_disable = zynqmp_dp_bridge_atomic_disable,
1577         .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
1578         .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
1579         .atomic_reset = drm_atomic_helper_bridge_reset,
1580         .atomic_check = zynqmp_dp_bridge_atomic_check,
1581         .detect = zynqmp_dp_bridge_detect,
1582         .get_edid = zynqmp_dp_bridge_get_edid,
1583 };
1584
1585 /* -----------------------------------------------------------------------------
1586  * Interrupt Handling
1587  */
1588
1589 /**
1590  * zynqmp_dp_enable_vblank - Enable vblank
1591  * @dp: DisplayPort IP core structure
1592  *
1593  * Enable vblank interrupt
1594  */
1595 void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp)
1596 {
1597         zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START);
1598 }
1599
1600 /**
1601  * zynqmp_dp_disable_vblank - Disable vblank
1602  * @dp: DisplayPort IP core structure
1603  *
1604  * Disable vblank interrupt
1605  */
1606 void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp)
1607 {
1608         zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START);
1609 }
1610
1611 static void zynqmp_dp_hpd_work_func(struct work_struct *work)
1612 {
1613         struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp,
1614                                             hpd_work.work);
1615         enum drm_connector_status status;
1616
1617         status = zynqmp_dp_bridge_detect(&dp->bridge);
1618         drm_bridge_hpd_notify(&dp->bridge, status);
1619 }
1620
1621 static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data)
1622 {
1623         struct zynqmp_dp *dp = (struct zynqmp_dp *)data;
1624         u32 status, mask;
1625
1626         status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS);
1627         mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK);
1628         if (!(status & ~mask))
1629                 return IRQ_NONE;
1630
1631         /* dbg for diagnostic, but not much that the driver can do */
1632         if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK)
1633                 dev_dbg_ratelimited(dp->dev, "underflow interrupt\n");
1634         if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK)
1635                 dev_dbg_ratelimited(dp->dev, "overflow interrupt\n");
1636
1637         zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status);
1638
1639         if (status & ZYNQMP_DP_INT_VBLANK_START)
1640                 zynqmp_dpsub_drm_handle_vblank(dp->dpsub);
1641
1642         if (status & ZYNQMP_DP_INT_HPD_EVENT)
1643                 schedule_delayed_work(&dp->hpd_work, 0);
1644
1645         if (status & ZYNQMP_DP_INT_HPD_IRQ) {
1646                 int ret;
1647                 u8 status[DP_LINK_STATUS_SIZE + 2];
1648
1649                 ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status,
1650                                        DP_LINK_STATUS_SIZE + 2);
1651                 if (ret < 0)
1652                         goto handled;
1653
1654                 if (status[4] & DP_LINK_STATUS_UPDATED ||
1655                     !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) ||
1656                     !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) {
1657                         zynqmp_dp_train_loop(dp);
1658                 }
1659         }
1660
1661 handled:
1662         return IRQ_HANDLED;
1663 }
1664
1665 /* -----------------------------------------------------------------------------
1666  * Initialization & Cleanup
1667  */
1668
1669 int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub)
1670 {
1671         struct platform_device *pdev = to_platform_device(dpsub->dev);
1672         struct drm_bridge *bridge;
1673         struct zynqmp_dp *dp;
1674         struct resource *res;
1675         int ret;
1676
1677         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1678         if (!dp)
1679                 return -ENOMEM;
1680
1681         dp->dev = &pdev->dev;
1682         dp->dpsub = dpsub;
1683         dp->status = connector_status_disconnected;
1684
1685         INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func);
1686
1687         /* Acquire all resources (IOMEM, IRQ and PHYs). */
1688         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp");
1689         dp->iomem = devm_ioremap_resource(dp->dev, res);
1690         if (IS_ERR(dp->iomem)) {
1691                 ret = PTR_ERR(dp->iomem);
1692                 goto err_free;
1693         }
1694
1695         dp->irq = platform_get_irq(pdev, 0);
1696         if (dp->irq < 0) {
1697                 ret = dp->irq;
1698                 goto err_free;
1699         }
1700
1701         dp->reset = devm_reset_control_get(dp->dev, NULL);
1702         if (IS_ERR(dp->reset)) {
1703                 if (PTR_ERR(dp->reset) != -EPROBE_DEFER)
1704                         dev_err(dp->dev, "failed to get reset: %ld\n",
1705                                 PTR_ERR(dp->reset));
1706                 ret = PTR_ERR(dp->reset);
1707                 goto err_free;
1708         }
1709
1710         ret = zynqmp_dp_reset(dp, false);
1711         if (ret < 0)
1712                 goto err_free;
1713
1714         ret = zynqmp_dp_phy_probe(dp);
1715         if (ret)
1716                 goto err_reset;
1717
1718         /* Initialize the bridge. */
1719         bridge = &dp->bridge;
1720         bridge->funcs = &zynqmp_dp_bridge_funcs;
1721         bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID
1722                     | DRM_BRIDGE_OP_HPD;
1723         bridge->type = DRM_MODE_CONNECTOR_DisplayPort;
1724         dpsub->bridge = bridge;
1725
1726         /*
1727          * Acquire the next bridge in the chain. Ignore errors caused by port@5
1728          * not being connected for backward-compatibility with older DTs.
1729          */
1730         ret = drm_of_find_panel_or_bridge(dp->dev->of_node, 5, 0, NULL,
1731                                           &dp->next_bridge);
1732         if (ret < 0 && ret != -ENODEV)
1733                 goto err_reset;
1734
1735         /* Initialize the hardware. */
1736         dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK;
1737         zynqmp_dp_set_format(dp, NULL, ZYNQMP_DPSUB_FORMAT_RGB, 8);
1738
1739         zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN,
1740                         ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL);
1741         zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET);
1742         zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1);
1743         zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
1744         zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
1745
1746         ret = zynqmp_dp_phy_init(dp);
1747         if (ret)
1748                 goto err_reset;
1749
1750         zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1);
1751
1752         /*
1753          * Now that the hardware is initialized and won't generate spurious
1754          * interrupts, request the IRQ.
1755          */
1756         ret = devm_request_threaded_irq(dp->dev, dp->irq, NULL,
1757                                         zynqmp_dp_irq_handler, IRQF_ONESHOT,
1758                                         dev_name(dp->dev), dp);
1759         if (ret < 0)
1760                 goto err_phy_exit;
1761
1762         dpsub->dp = dp;
1763
1764         dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n",
1765                 dp->num_lanes);
1766
1767         return 0;
1768
1769 err_phy_exit:
1770         zynqmp_dp_phy_exit(dp);
1771 err_reset:
1772         zynqmp_dp_reset(dp, true);
1773 err_free:
1774         kfree(dp);
1775         return ret;
1776 }
1777
1778 void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub)
1779 {
1780         struct zynqmp_dp *dp = dpsub->dp;
1781
1782         zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL);
1783         disable_irq(dp->irq);
1784
1785         cancel_delayed_work_sync(&dp->hpd_work);
1786
1787         zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0);
1788         zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff);
1789
1790         zynqmp_dp_phy_exit(dp);
1791         zynqmp_dp_reset(dp, true);
1792 }