drivers/gpu/drm/imx/dw_hdmi-imx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
   3  *
   4  * derived from imx-hdmi.c(renamed to bridge/dw_hdmi.c now)
   5  */
   6
   7 #include <linux/component.h>
   8 #include <linux/mfd/syscon.h>
   9 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13
  14 #include <video/imx-ipu-v3.h>
  15
  16 #include <drm/bridge/dw_hdmi.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_edid.h>
  19 #include <drm/drm_encoder.h>
  20 #include <drm/drm_of.h>
  21 #include <drm/drm_simple_kms_helper.h>
  22
  23 #include "imx-drm.h"
  24
  25 struct imx_hdmi {
  26         struct device *dev;
  27         struct drm_encoder encoder;
  28         struct dw_hdmi *hdmi;
  29         struct regmap *regmap;
  30 };
  31
  32 static inline struct imx_hdmi *enc_to_imx_hdmi(struct drm_encoder *e)
  33 {
  34         return container_of(e, struct imx_hdmi, encoder);
  35 }
  36
  37 static const struct dw_hdmi_mpll_config imx_mpll_cfg[] = {
  38         {
  39                 45250000, {
  40                         { 0x01e0, 0x0000 },
  41                         { 0x21e1, 0x0000 },
  42                         { 0x41e2, 0x0000 }
  43                 },
  44         }, {
  45                 92500000, {
  46                         { 0x0140, 0x0005 },
  47                         { 0x2141, 0x0005 },
  48                         { 0x4142, 0x0005 },
  49         },
  50         }, {
  51                 148500000, {
  52                         { 0x00a0, 0x000a },
  53                         { 0x20a1, 0x000a },
  54                         { 0x40a2, 0x000a },
  55                 },
  56         }, {
  57                 216000000, {
  58                         { 0x00a0, 0x000a },
  59                         { 0x2001, 0x000f },
  60                         { 0x4002, 0x000f },
  61                 },
  62         }, {
  63                 ~0UL, {
  64                         { 0x0000, 0x0000 },
  65                         { 0x0000, 0x0000 },
  66                         { 0x0000, 0x0000 },
  67                 },
  68         }
  69 };
  70
  71 static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
  72         /*      pixelclk     bpp8    bpp10   bpp12 */
  73         {
  74                 54000000, { 0x091c, 0x091c, 0x06dc },
  75         }, {
  76                 58400000, { 0x091c, 0x06dc, 0x06dc },
  77         }, {
  78                 72000000, { 0x06dc, 0x06dc, 0x091c },
  79         }, {
  80                 74250000, { 0x06dc, 0x0b5c, 0x091c },
  81         }, {
  82                 118800000, { 0x091c, 0x091c, 0x06dc },
  83         }, {
  84                 216000000, { 0x06dc, 0x0b5c, 0x091c },
  85         }, {
  86                 ~0UL, { 0x0000, 0x0000, 0x0000 },
  87         },
  88 };
  89
  90 /*
  91  * Resistance term 133Ohm Cfg
  92  * PREEMP config 0.00
  93  * TX/CK level 10
  94  */
  95 static const struct dw_hdmi_phy_config imx_phy_config[] = {
  96         /*pixelclk   symbol   term   vlev */
  97         { 216000000, 0x800d, 0x0005, 0x01ad},
  98         { ~0UL,      0x0000, 0x0000, 0x0000}
  99 };
 100
 101 static int dw_hdmi_imx_parse_dt(struct imx_hdmi *hdmi)
 102 {
 103         struct device_node *np = hdmi->dev->of_node;
 104
 105         hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 106         if (IS_ERR(hdmi->regmap)) {
 107                 dev_err(hdmi->dev, "Unable to get gpr\n");
 108                 return PTR_ERR(hdmi->regmap);
 109         }
 110
 111         return 0;
 112 }
 113
 114 static void dw_hdmi_imx_encoder_disable(struct drm_encoder *encoder)
 115 {
 116 }
 117
 118 static void dw_hdmi_imx_encoder_enable(struct drm_encoder *encoder)
 119 {
 120         struct imx_hdmi *hdmi = enc_to_imx_hdmi(encoder);
 121         int mux = drm_of_encoder_active_port_id(hdmi->dev->of_node, encoder);
 122
 123         regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
 124                            IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
 125                            mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
 126 }
 127
 128 static int dw_hdmi_imx_atomic_check(struct drm_encoder *encoder,
 129                                     struct drm_crtc_state *crtc_state,
 130                                     struct drm_connector_state *conn_state)
 131 {
 132         struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc_state);
 133
 134         imx_crtc_state->bus_format = MEDIA_BUS_FMT_RGB888_1X24;
 135         imx_crtc_state->di_hsync_pin = 2;
 136         imx_crtc_state->di_vsync_pin = 3;
 137
 138         return 0;
 139 }
 140
 141 static const struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
 142         .enable     = dw_hdmi_imx_encoder_enable,
 143         .disable    = dw_hdmi_imx_encoder_disable,
 144         .atomic_check = dw_hdmi_imx_atomic_check,
 145 };
 146
 147 static enum drm_mode_status
 148 imx6q_hdmi_mode_valid(struct drm_connector *con,
 149                       const struct drm_display_mode *mode)
 150 {
 151         if (mode->clock < 13500)
 152                 return MODE_CLOCK_LOW;
 153         /* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
 154         if (mode->clock > 216000)
 155                 return MODE_CLOCK_HIGH;
 156
 157         return MODE_OK;
 158 }
 159
 160 static enum drm_mode_status
 161 imx6dl_hdmi_mode_valid(struct drm_connector *con,
 162                        const struct drm_display_mode *mode)
 163 {
 164         if (mode->clock < 13500)
 165                 return MODE_CLOCK_LOW;
 166         /* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
 167         if (mode->clock > 216000)
 168                 return MODE_CLOCK_HIGH;
 169
 170         return MODE_OK;
 171 }
 172
 173 static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
 174         .mpll_cfg   = imx_mpll_cfg,
 175         .cur_ctr    = imx_cur_ctr,
 176         .phy_config = imx_phy_config,
 177         .mode_valid = imx6q_hdmi_mode_valid,
 178 };
 179
 180 static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
 181         .mpll_cfg = imx_mpll_cfg,
 182         .cur_ctr  = imx_cur_ctr,
 183         .phy_config = imx_phy_config,
 184         .mode_valid = imx6dl_hdmi_mode_valid,
 185 };
 186
 187 static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
 188         { .compatible = "fsl,imx6q-hdmi",
 189           .data = &imx6q_hdmi_drv_data
 190         }, {
 191           .compatible = "fsl,imx6dl-hdmi",
 192           .data = &imx6dl_hdmi_drv_data
 193         },
 194         {},
 195 };
 196 MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
 197
 198 static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
 199                             void *data)
 200 {
 201         struct platform_device *pdev = to_platform_device(dev);
 202         const struct dw_hdmi_plat_data *plat_data;
 203         const struct of_device_id *match;
 204         struct drm_device *drm = data;
 205         struct drm_encoder *encoder;
 206         struct imx_hdmi *hdmi;
 207         int ret;
 208
 209         if (!pdev->dev.of_node)
 210                 return -ENODEV;
 211
 212         hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 213         if (!hdmi)
 214                 return -ENOMEM;
 215
 216         match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
 217         plat_data = match->data;
 218         hdmi->dev = &pdev->dev;
 219         encoder = &hdmi->encoder;
 220
 221         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 222         /*
 223          * If we failed to find the CRTC(s) which this encoder is
 224          * supposed to be connected to, it's because the CRTC has
 225          * not been registered yet.  Defer probing, and hope that
 226          * the required CRTC is added later.
 227          */
 228         if (encoder->possible_crtcs == 0)
 229                 return -EPROBE_DEFER;
 230
 231         ret = dw_hdmi_imx_parse_dt(hdmi);
 232         if (ret < 0)
 233                 return ret;
 234
 235         drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
 236         drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
 237
 238         platform_set_drvdata(pdev, hdmi);
 239
 240         hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
 241
 242         /*
 243          * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
 244          * which would have called the encoder cleanup.  Do it manually.
 245          */
 246         if (IS_ERR(hdmi->hdmi)) {
 247                 ret = PTR_ERR(hdmi->hdmi);
 248                 drm_encoder_cleanup(encoder);
 249         }
 250
 251         return ret;
 252 }
 253
 254 static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
 255                                void *data)
 256 {
 257         struct imx_hdmi *hdmi = dev_get_drvdata(dev);
 258
 259         dw_hdmi_unbind(hdmi->hdmi);
 260 }
 261
 262 static const struct component_ops dw_hdmi_imx_ops = {
 263         .bind   = dw_hdmi_imx_bind,
 264         .unbind = dw_hdmi_imx_unbind,
 265 };
 266
 267 static int dw_hdmi_imx_probe(struct platform_device *pdev)
 268 {
 269         return component_add(&pdev->dev, &dw_hdmi_imx_ops);
 270 }
 271
 272 static int dw_hdmi_imx_remove(struct platform_device *pdev)
 273 {
 274         component_del(&pdev->dev, &dw_hdmi_imx_ops);
 275
 276         return 0;
 277 }
 278
 279 static struct platform_driver dw_hdmi_imx_platform_driver = {
 280         .probe  = dw_hdmi_imx_probe,
 281         .remove = dw_hdmi_imx_remove,
 282         .driver = {
 283                 .name = "dwhdmi-imx",
 284                 .of_match_table = dw_hdmi_imx_dt_ids,
 285         },
 286 };
 287
 288 module_platform_driver(dw_hdmi_imx_platform_driver);
 289
 290 MODULE_AUTHOR("Andy Yan <[email protected]>");
 291 MODULE_AUTHOR("Yakir Yang <[email protected]>");
 292 MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
 293 MODULE_LICENSE("GPL");
 294 MODULE_ALIAS("platform:dwhdmi-imx");