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