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

   1 /* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
   2  *
   3  * derived from imx-hdmi.c(renamed to bridge/dw_hdmi.c now)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/component.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  14 #include <drm/bridge/dw_hdmi.h>
  15 #include <video/imx-ipu-v3.h>
  16 #include <linux/regmap.h>
  17 #include <drm/drm_of.h>
  18 #include <drm/drmP.h>
  19 #include <drm/drm_crtc_helper.h>
  20 #include <drm/drm_edid.h>
  21 #include <drm/drm_encoder_slave.h>
  22
  23 #include "imx-drm.h"
  24
  25 struct imx_hdmi {
  26         struct device *dev;
  27         struct drm_encoder encoder;
  28         struct regmap *regmap;
  29 };
  30
  31 static const struct dw_hdmi_mpll_config imx_mpll_cfg[] = {
  32         {
  33                 45250000, {
  34                         { 0x01e0, 0x0000 },
  35                         { 0x21e1, 0x0000 },
  36                         { 0x41e2, 0x0000 }
  37                 },
  38         }, {
  39                 92500000, {
  40                         { 0x0140, 0x0005 },
  41                         { 0x2141, 0x0005 },
  42                         { 0x4142, 0x0005 },
  43         },
  44         }, {
  45                 148500000, {
  46                         { 0x00a0, 0x000a },
  47                         { 0x20a1, 0x000a },
  48                         { 0x40a2, 0x000a },
  49                 },
  50         }, {
  51                 216000000, {
  52                         { 0x00a0, 0x000a },
  53                         { 0x2001, 0x000f },
  54                         { 0x4002, 0x000f },
  55                 },
  56         }, {
  57                 ~0UL, {
  58                         { 0x0000, 0x0000 },
  59                         { 0x0000, 0x0000 },
  60                         { 0x0000, 0x0000 },
  61                 },
  62         }
  63 };
  64
  65 static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
  66         /*      pixelclk     bpp8    bpp10   bpp12 */
  67         {
  68                 54000000, { 0x091c, 0x091c, 0x06dc },
  69         }, {
  70                 58400000, { 0x091c, 0x06dc, 0x06dc },
  71         }, {
  72                 72000000, { 0x06dc, 0x06dc, 0x091c },
  73         }, {
  74                 74250000, { 0x06dc, 0x0b5c, 0x091c },
  75         }, {
  76                 118800000, { 0x091c, 0x091c, 0x06dc },
  77         }, {
  78                 216000000, { 0x06dc, 0x0b5c, 0x091c },
  79         }, {
  80                 ~0UL, { 0x0000, 0x0000, 0x0000 },
  81         },
  82 };
  83
  84 /*
  85  * Resistance term 133Ohm Cfg
  86  * PREEMP config 0.00
  87  * TX/CK level 10
  88  */
  89 static const struct dw_hdmi_phy_config imx_phy_config[] = {
  90         /*pixelclk   symbol   term   vlev */
  91         { 216000000, 0x800d, 0x0005, 0x01ad},
  92         { ~0UL,      0x0000, 0x0000, 0x0000}
  93 };
  94
  95 static int dw_hdmi_imx_parse_dt(struct imx_hdmi *hdmi)
  96 {
  97         struct device_node *np = hdmi->dev->of_node;
  98
  99         hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
 100         if (IS_ERR(hdmi->regmap)) {
 101                 dev_err(hdmi->dev, "Unable to get gpr\n");
 102                 return PTR_ERR(hdmi->regmap);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static void dw_hdmi_imx_encoder_disable(struct drm_encoder *encoder)
 109 {
 110 }
 111
 112 static bool dw_hdmi_imx_encoder_mode_fixup(struct drm_encoder *encoder,
 113                                            const struct drm_display_mode *mode,
 114                                            struct drm_display_mode *adj_mode)
 115 {
 116         return true;
 117 }
 118
 119 static void dw_hdmi_imx_encoder_mode_set(struct drm_encoder *encoder,
 120                                          struct drm_display_mode *mode,
 121                                          struct drm_display_mode *adj_mode)
 122 {
 123 }
 124
 125 static void dw_hdmi_imx_encoder_commit(struct drm_encoder *encoder)
 126 {
 127         struct imx_hdmi *hdmi = container_of(encoder, struct imx_hdmi, encoder);
 128         int mux = imx_drm_encoder_get_mux_id(hdmi->dev->of_node, encoder);
 129
 130         regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
 131                            IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
 132                            mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
 133 }
 134
 135 static void dw_hdmi_imx_encoder_prepare(struct drm_encoder *encoder)
 136 {
 137         imx_drm_set_bus_format(encoder, MEDIA_BUS_FMT_RGB888_1X24);
 138 }
 139
 140 static struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
 141         .mode_fixup = dw_hdmi_imx_encoder_mode_fixup,
 142         .mode_set   = dw_hdmi_imx_encoder_mode_set,
 143         .prepare    = dw_hdmi_imx_encoder_prepare,
 144         .commit     = dw_hdmi_imx_encoder_commit,
 145         .disable    = dw_hdmi_imx_encoder_disable,
 146 };
 147
 148 static struct drm_encoder_funcs dw_hdmi_imx_encoder_funcs = {
 149         .destroy = drm_encoder_cleanup,
 150 };
 151
 152 static enum drm_mode_status imx6q_hdmi_mode_valid(struct drm_connector *con,
 153                                                   struct drm_display_mode *mode)
 154 {
 155         if (mode->clock < 13500)
 156                 return MODE_CLOCK_LOW;
 157         /* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
 158         if (mode->clock > 216000)
 159                 return MODE_CLOCK_HIGH;
 160
 161         return MODE_OK;
 162 }
 163
 164 static enum drm_mode_status imx6dl_hdmi_mode_valid(struct drm_connector *con,
 165                                                    struct drm_display_mode *mode)
 166 {
 167         if (mode->clock < 13500)
 168                 return MODE_CLOCK_LOW;
 169         /* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
 170         if (mode->clock > 216000)
 171                 return MODE_CLOCK_HIGH;
 172
 173         return MODE_OK;
 174 }
 175
 176 static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
 177         .mpll_cfg   = imx_mpll_cfg,
 178         .cur_ctr    = imx_cur_ctr,
 179         .phy_config = imx_phy_config,
 180         .dev_type   = IMX6Q_HDMI,
 181         .mode_valid = imx6q_hdmi_mode_valid,
 182 };
 183
 184 static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
 185         .mpll_cfg = imx_mpll_cfg,
 186         .cur_ctr  = imx_cur_ctr,
 187         .phy_config = imx_phy_config,
 188         .dev_type = IMX6DL_HDMI,
 189         .mode_valid = imx6dl_hdmi_mode_valid,
 190 };
 191
 192 static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
 193         { .compatible = "fsl,imx6q-hdmi",
 194           .data = &imx6q_hdmi_drv_data
 195         }, {
 196           .compatible = "fsl,imx6dl-hdmi",
 197           .data = &imx6dl_hdmi_drv_data
 198         },
 199         {},
 200 };
 201 MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
 202
 203 static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
 204                             void *data)
 205 {
 206         struct platform_device *pdev = to_platform_device(dev);
 207         const struct dw_hdmi_plat_data *plat_data;
 208         const struct of_device_id *match;
 209         struct drm_device *drm = data;
 210         struct drm_encoder *encoder;
 211         struct imx_hdmi *hdmi;
 212         struct resource *iores;
 213         int irq;
 214         int ret;
 215
 216         if (!pdev->dev.of_node)
 217                 return -ENODEV;
 218
 219         hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 220         if (!hdmi)
 221                 return -ENOMEM;
 222
 223         match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
 224         plat_data = match->data;
 225         hdmi->dev = &pdev->dev;
 226         encoder = &hdmi->encoder;
 227
 228         irq = platform_get_irq(pdev, 0);
 229         if (irq < 0)
 230                 return irq;
 231
 232         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 233         if (!iores)
 234                 return -ENXIO;
 235
 236         platform_set_drvdata(pdev, hdmi);
 237
 238         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 239         /*
 240          * If we failed to find the CRTC(s) which this encoder is
 241          * supposed to be connected to, it's because the CRTC has
 242          * not been registered yet.  Defer probing, and hope that
 243          * the required CRTC is added later.
 244          */
 245         if (encoder->possible_crtcs == 0)
 246                 return -EPROBE_DEFER;
 247
 248         ret = dw_hdmi_imx_parse_dt(hdmi);
 249         if (ret < 0)
 250                 return ret;
 251
 252         drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
 253         drm_encoder_init(drm, encoder, &dw_hdmi_imx_encoder_funcs,
 254                          DRM_MODE_ENCODER_TMDS);
 255
 256         return dw_hdmi_bind(dev, master, data, encoder, iores, irq, plat_data);
 257 }
 258
 259 static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
 260                                void *data)
 261 {
 262         return dw_hdmi_unbind(dev, master, data);
 263 }
 264
 265 static const struct component_ops dw_hdmi_imx_ops = {
 266         .bind   = dw_hdmi_imx_bind,
 267         .unbind = dw_hdmi_imx_unbind,
 268 };
 269
 270 static int dw_hdmi_imx_probe(struct platform_device *pdev)
 271 {
 272         return component_add(&pdev->dev, &dw_hdmi_imx_ops);
 273 }
 274
 275 static int dw_hdmi_imx_remove(struct platform_device *pdev)
 276 {
 277         component_del(&pdev->dev, &dw_hdmi_imx_ops);
 278
 279         return 0;
 280 }
 281
 282 static struct platform_driver dw_hdmi_imx_platform_driver = {
 283         .probe  = dw_hdmi_imx_probe,
 284         .remove = dw_hdmi_imx_remove,
 285         .driver = {
 286                 .name = "dwhdmi-imx",
 287                 .of_match_table = dw_hdmi_imx_dt_ids,
 288         },
 289 };
 290
 291 module_platform_driver(dw_hdmi_imx_platform_driver);
 292
 293 MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
 294 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
 295 MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
 296 MODULE_LICENSE("GPL");
 297 MODULE_ALIAS("platform:dwhdmi-imx");