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                 ~0UL, {
  52                         { 0x00a0, 0x000a },
  53                         { 0x2001, 0x000f },
  54                         { 0x4002, 0x000f },
  55                 },
  56         }
  57 };
  58
  59 static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
  60         /*      pixelclk     bpp8    bpp10   bpp12 */
  61         {
  62                 54000000, { 0x091c, 0x091c, 0x06dc },
  63         }, {
  64                 58400000, { 0x091c, 0x06dc, 0x06dc },
  65         }, {
  66                 72000000, { 0x06dc, 0x06dc, 0x091c },
  67         }, {
  68                 74250000, { 0x06dc, 0x0b5c, 0x091c },
  69         }, {
  70                 118800000, { 0x091c, 0x091c, 0x06dc },
  71         }, {
  72                 216000000, { 0x06dc, 0x0b5c, 0x091c },
  73         }, {
  74                 ~0UL, { 0x0000, 0x0000, 0x0000 },
  75         },
  76 };
  77
  78 /*
  79  * Resistance term 133Ohm Cfg
  80  * PREEMP config 0.00
  81  * TX/CK level 10
  82  */
  83 static const struct dw_hdmi_phy_config imx_phy_config[] = {
  84         /*pixelclk   symbol   term   vlev */
  85         { 148500000, 0x800d, 0x0005, 0x01ad},
  86         { ~0UL,      0x0000, 0x0000, 0x0000}
  87 };
  88
  89 static int dw_hdmi_imx_parse_dt(struct imx_hdmi *hdmi)
  90 {
  91         struct device_node *np = hdmi->dev->of_node;
  92
  93         hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
  94         if (IS_ERR(hdmi->regmap)) {
  95                 dev_err(hdmi->dev, "Unable to get gpr\n");
  96                 return PTR_ERR(hdmi->regmap);
  97         }
  98
  99         return 0;
 100 }
 101
 102 static void dw_hdmi_imx_encoder_disable(struct drm_encoder *encoder)
 103 {
 104 }
 105
 106 static bool dw_hdmi_imx_encoder_mode_fixup(struct drm_encoder *encoder,
 107                                            const struct drm_display_mode *mode,
 108                                            struct drm_display_mode *adj_mode)
 109 {
 110         return true;
 111 }
 112
 113 static void dw_hdmi_imx_encoder_mode_set(struct drm_encoder *encoder,
 114                                          struct drm_display_mode *mode,
 115                                          struct drm_display_mode *adj_mode)
 116 {
 117 }
 118
 119 static void dw_hdmi_imx_encoder_commit(struct drm_encoder *encoder)
 120 {
 121         struct imx_hdmi *hdmi = container_of(encoder, struct imx_hdmi, encoder);
 122         int mux = imx_drm_encoder_get_mux_id(hdmi->dev->of_node, encoder);
 123
 124         regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
 125                            IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
 126                            mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
 127 }
 128
 129 static void dw_hdmi_imx_encoder_prepare(struct drm_encoder *encoder)
 130 {
 131         imx_drm_set_bus_format(encoder, MEDIA_BUS_FMT_RGB888_1X24);
 132 }
 133
 134 static struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
 135         .mode_fixup = dw_hdmi_imx_encoder_mode_fixup,
 136         .mode_set   = dw_hdmi_imx_encoder_mode_set,
 137         .prepare    = dw_hdmi_imx_encoder_prepare,
 138         .commit     = dw_hdmi_imx_encoder_commit,
 139         .disable    = dw_hdmi_imx_encoder_disable,
 140 };
 141
 142 static struct drm_encoder_funcs dw_hdmi_imx_encoder_funcs = {
 143         .destroy = drm_encoder_cleanup,
 144 };
 145
 146 static enum drm_mode_status imx6q_hdmi_mode_valid(struct drm_connector *con,
 147                                                   struct drm_display_mode *mode)
 148 {
 149         if (mode->clock < 13500)
 150                 return MODE_CLOCK_LOW;
 151         if (mode->clock > 266000)
 152                 return MODE_CLOCK_HIGH;
 153
 154         return MODE_OK;
 155 }
 156
 157 static enum drm_mode_status imx6dl_hdmi_mode_valid(struct drm_connector *con,
 158                                                    struct drm_display_mode *mode)
 159 {
 160         if (mode->clock < 13500)
 161                 return MODE_CLOCK_LOW;
 162         if (mode->clock > 270000)
 163                 return MODE_CLOCK_HIGH;
 164
 165         return MODE_OK;
 166 }
 167
 168 static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
 169         .mpll_cfg   = imx_mpll_cfg,
 170         .cur_ctr    = imx_cur_ctr,
 171         .phy_config = imx_phy_config,
 172         .dev_type   = IMX6Q_HDMI,
 173         .mode_valid = imx6q_hdmi_mode_valid,
 174 };
 175
 176 static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
 177         .mpll_cfg = imx_mpll_cfg,
 178         .cur_ctr  = imx_cur_ctr,
 179         .phy_config = imx_phy_config,
 180         .dev_type = IMX6DL_HDMI,
 181         .mode_valid = imx6dl_hdmi_mode_valid,
 182 };
 183
 184 static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
 185         { .compatible = "fsl,imx6q-hdmi",
 186           .data = &imx6q_hdmi_drv_data
 187         }, {
 188           .compatible = "fsl,imx6dl-hdmi",
 189           .data = &imx6dl_hdmi_drv_data
 190         },
 191         {},
 192 };
 193 MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
 194
 195 static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
 196                             void *data)
 197 {
 198         struct platform_device *pdev = to_platform_device(dev);
 199         const struct dw_hdmi_plat_data *plat_data;
 200         const struct of_device_id *match;
 201         struct drm_device *drm = data;
 202         struct drm_encoder *encoder;
 203         struct imx_hdmi *hdmi;
 204         struct resource *iores;
 205         int irq;
 206         int ret;
 207
 208         if (!pdev->dev.of_node)
 209                 return -ENODEV;
 210
 211         hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 212         if (!hdmi)
 213                 return -ENOMEM;
 214
 215         match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
 216         plat_data = match->data;
 217         hdmi->dev = &pdev->dev;
 218         encoder = &hdmi->encoder;
 219
 220         irq = platform_get_irq(pdev, 0);
 221         if (irq < 0)
 222                 return irq;
 223
 224         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 225         if (!iores)
 226                 return -ENXIO;
 227
 228         platform_set_drvdata(pdev, hdmi);
 229
 230         encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
 231         /*
 232          * If we failed to find the CRTC(s) which this encoder is
 233          * supposed to be connected to, it's because the CRTC has
 234          * not been registered yet.  Defer probing, and hope that
 235          * the required CRTC is added later.
 236          */
 237         if (encoder->possible_crtcs == 0)
 238                 return -EPROBE_DEFER;
 239
 240         ret = dw_hdmi_imx_parse_dt(hdmi);
 241         if (ret < 0)
 242                 return ret;
 243
 244         drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
 245         drm_encoder_init(drm, encoder, &dw_hdmi_imx_encoder_funcs,
 246                          DRM_MODE_ENCODER_TMDS);
 247
 248         return dw_hdmi_bind(dev, master, data, encoder, iores, irq, plat_data);
 249 }
 250
 251 static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
 252                                void *data)
 253 {
 254         return dw_hdmi_unbind(dev, master, data);
 255 }
 256
 257 static const struct component_ops dw_hdmi_imx_ops = {
 258         .bind   = dw_hdmi_imx_bind,
 259         .unbind = dw_hdmi_imx_unbind,
 260 };
 261
 262 static int dw_hdmi_imx_probe(struct platform_device *pdev)
 263 {
 264         return component_add(&pdev->dev, &dw_hdmi_imx_ops);
 265 }
 266
 267 static int dw_hdmi_imx_remove(struct platform_device *pdev)
 268 {
 269         component_del(&pdev->dev, &dw_hdmi_imx_ops);
 270
 271         return 0;
 272 }
 273
 274 static struct platform_driver dw_hdmi_imx_platform_driver = {
 275         .probe  = dw_hdmi_imx_probe,
 276         .remove = dw_hdmi_imx_remove,
 277         .driver = {
 278                 .name = "dwhdmi-imx",
 279                 .of_match_table = dw_hdmi_imx_dt_ids,
 280         },
 281 };
 282
 283 module_platform_driver(dw_hdmi_imx_platform_driver);
 284
 285 MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
 286 MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
 287 MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
 288 MODULE_LICENSE("GPL");
 289 MODULE_ALIAS("platform:dwhdmi-imx");