drivers/gpu/drm/sun4i/sun8i_dw_hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2018 Jernej Skrabec <jernej.skrabec@siol.net>
   4  */
   5
   6 #include <linux/component.h>
   7 #include <linux/module.h>
   8 #include <linux/of_device.h>
   9 #include <linux/platform_device.h>
  10
  11 #include <drm/drm_crtc_helper.h>
  12 #include <drm/drm_of.h>
  13 #include <drm/drm_simple_kms_helper.h>
  14
  15 #include "sun8i_dw_hdmi.h"
  16 #include "sun8i_tcon_top.h"
  17
  18 static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
  19                                            struct drm_display_mode *mode,
  20                                            struct drm_display_mode *adj_mode)
  21 {
  22         struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
  23
  24         if (hdmi->quirks->set_rate)
  25                 clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
  26 }
  27
  28 static const struct drm_encoder_helper_funcs
  29 sun8i_dw_hdmi_encoder_helper_funcs = {
  30         .mode_set = sun8i_dw_hdmi_encoder_mode_set,
  31 };
  32
  33 static enum drm_mode_status
  34 sun8i_dw_hdmi_mode_valid_a83t(struct dw_hdmi *hdmi, void *data,
  35                               const struct drm_display_info *info,
  36                               const struct drm_display_mode *mode)
  37 {
  38         if (mode->clock > 297000)
  39                 return MODE_CLOCK_HIGH;
  40
  41         return MODE_OK;
  42 }
  43
  44 static enum drm_mode_status
  45 sun8i_dw_hdmi_mode_valid_h6(struct dw_hdmi *hdmi, void *data,
  46                             const struct drm_display_info *info,
  47                             const struct drm_display_mode *mode)
  48 {
  49         /*
  50          * Controller support maximum of 594 MHz, which correlates to
  51          * 4K@60Hz 4:4:4 or RGB. However, for frequencies greater than
  52          * 340 MHz scrambling has to be enabled. Because scrambling is
  53          * not yet implemented, just limit to 340 MHz for now.
  54          */
  55         if (mode->clock > 340000)
  56                 return MODE_CLOCK_HIGH;
  57
  58         return MODE_OK;
  59 }
  60
  61 static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
  62 {
  63         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
  64                 !!of_match_node(sun8i_tcon_top_of_table, node);
  65 }
  66
  67 static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
  68                                              struct device_node *node)
  69 {
  70         struct device_node *port, *ep, *remote, *remote_port;
  71         u32 crtcs = 0;
  72
  73         remote = of_graph_get_remote_node(node, 0, -1);
  74         if (!remote)
  75                 return 0;
  76
  77         if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
  78                 port = of_graph_get_port_by_id(remote, 4);
  79                 if (!port)
  80                         goto crtcs_exit;
  81
  82                 for_each_child_of_node(port, ep) {
  83                         remote_port = of_graph_get_remote_port(ep);
  84                         if (remote_port) {
  85                                 crtcs |= drm_of_crtc_port_mask(drm, remote_port);
  86                                 of_node_put(remote_port);
  87                         }
  88                 }
  89         } else {
  90                 crtcs = drm_of_find_possible_crtcs(drm, node);
  91         }
  92
  93 crtcs_exit:
  94         of_node_put(remote);
  95
  96         return crtcs;
  97 }
  98
  99 static int sun8i_dw_hdmi_find_connector_pdev(struct device *dev,
 100                                              struct platform_device **pdev_out)
 101 {
 102         struct platform_device *pdev;
 103         struct device_node *remote;
 104
 105         remote = of_graph_get_remote_node(dev->of_node, 1, -1);
 106         if (!remote)
 107                 return -ENODEV;
 108
 109         if (!of_device_is_compatible(remote, "hdmi-connector")) {
 110                 of_node_put(remote);
 111                 return -ENODEV;
 112         }
 113
 114         pdev = of_find_device_by_node(remote);
 115         of_node_put(remote);
 116         if (!pdev)
 117                 return -ENODEV;
 118
 119         *pdev_out = pdev;
 120         return 0;
 121 }
 122
 123 static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
 124                               void *data)
 125 {
 126         struct platform_device *pdev = to_platform_device(dev), *connector_pdev;
 127         struct dw_hdmi_plat_data *plat_data;
 128         struct drm_device *drm = data;
 129         struct device_node *phy_node;
 130         struct drm_encoder *encoder;
 131         struct sun8i_dw_hdmi *hdmi;
 132         int ret;
 133
 134         if (!pdev->dev.of_node)
 135                 return -ENODEV;
 136
 137         hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 138         if (!hdmi)
 139                 return -ENOMEM;
 140
 141         plat_data = &hdmi->plat_data;
 142         hdmi->dev = &pdev->dev;
 143         encoder = &hdmi->encoder;
 144
 145         hdmi->quirks = of_device_get_match_data(dev);
 146
 147         encoder->possible_crtcs =
 148                 sun8i_dw_hdmi_find_possible_crtcs(drm, dev->of_node);
 149         /*
 150          * If we failed to find the CRTC(s) which this encoder is
 151          * supposed to be connected to, it's because the CRTC has
 152          * not been registered yet.  Defer probing, and hope that
 153          * the required CRTC is added later.
 154          */
 155         if (encoder->possible_crtcs == 0)
 156                 return -EPROBE_DEFER;
 157
 158         hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
 159         if (IS_ERR(hdmi->rst_ctrl)) {
 160                 dev_err(dev, "Could not get ctrl reset control\n");
 161                 return PTR_ERR(hdmi->rst_ctrl);
 162         }
 163
 164         hdmi->clk_tmds = devm_clk_get(dev, "tmds");
 165         if (IS_ERR(hdmi->clk_tmds)) {
 166                 dev_err(dev, "Couldn't get the tmds clock\n");
 167                 return PTR_ERR(hdmi->clk_tmds);
 168         }
 169
 170         hdmi->regulator = devm_regulator_get(dev, "hvcc");
 171         if (IS_ERR(hdmi->regulator)) {
 172                 dev_err(dev, "Couldn't get regulator\n");
 173                 return PTR_ERR(hdmi->regulator);
 174         }
 175
 176         ret = sun8i_dw_hdmi_find_connector_pdev(dev, &connector_pdev);
 177         if (!ret) {
 178                 hdmi->ddc_en = gpiod_get_optional(&connector_pdev->dev,
 179                                                   "ddc-en", GPIOD_OUT_HIGH);
 180                 platform_device_put(connector_pdev);
 181
 182                 if (IS_ERR(hdmi->ddc_en)) {
 183                         dev_err(dev, "Couldn't get ddc-en gpio\n");
 184                         return PTR_ERR(hdmi->ddc_en);
 185                 }
 186         }
 187
 188         ret = regulator_enable(hdmi->regulator);
 189         if (ret) {
 190                 dev_err(dev, "Failed to enable regulator\n");
 191                 goto err_unref_ddc_en;
 192         }
 193
 194         gpiod_set_value(hdmi->ddc_en, 1);
 195
 196         ret = reset_control_deassert(hdmi->rst_ctrl);
 197         if (ret) {
 198                 dev_err(dev, "Could not deassert ctrl reset control\n");
 199                 goto err_disable_ddc_en;
 200         }
 201
 202         ret = clk_prepare_enable(hdmi->clk_tmds);
 203         if (ret) {
 204                 dev_err(dev, "Could not enable tmds clock\n");
 205                 goto err_assert_ctrl_reset;
 206         }
 207
 208         phy_node = of_parse_phandle(dev->of_node, "phys", 0);
 209         if (!phy_node) {
 210                 dev_err(dev, "Can't found PHY phandle\n");
 211                 ret = -EINVAL;
 212                 goto err_disable_clk_tmds;
 213         }
 214
 215         ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
 216         of_node_put(phy_node);
 217         if (ret) {
 218                 dev_err(dev, "Couldn't get the HDMI PHY\n");
 219                 goto err_disable_clk_tmds;
 220         }
 221
 222         drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
 223         drm_simple_encoder_init(drm, encoder, DRM_MODE_ENCODER_TMDS);
 224
 225         sun8i_hdmi_phy_init(hdmi->phy);
 226
 227         plat_data->mode_valid = hdmi->quirks->mode_valid;
 228         plat_data->use_drm_infoframe = hdmi->quirks->use_drm_infoframe;
 229         sun8i_hdmi_phy_set_ops(hdmi->phy, plat_data);
 230
 231         platform_set_drvdata(pdev, hdmi);
 232
 233         hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
 234
 235         /*
 236          * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
 237          * which would have called the encoder cleanup.  Do it manually.
 238          */
 239         if (IS_ERR(hdmi->hdmi)) {
 240                 ret = PTR_ERR(hdmi->hdmi);
 241                 goto cleanup_encoder;
 242         }
 243
 244         return 0;
 245
 246 cleanup_encoder:
 247         drm_encoder_cleanup(encoder);
 248         sun8i_hdmi_phy_remove(hdmi);
 249 err_disable_clk_tmds:
 250         clk_disable_unprepare(hdmi->clk_tmds);
 251 err_assert_ctrl_reset:
 252         reset_control_assert(hdmi->rst_ctrl);
 253 err_disable_ddc_en:
 254         gpiod_set_value(hdmi->ddc_en, 0);
 255         regulator_disable(hdmi->regulator);
 256 err_unref_ddc_en:
 257         if (hdmi->ddc_en)
 258                 gpiod_put(hdmi->ddc_en);
 259
 260         return ret;
 261 }
 262
 263 static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
 264                                  void *data)
 265 {
 266         struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
 267
 268         dw_hdmi_unbind(hdmi->hdmi);
 269         sun8i_hdmi_phy_remove(hdmi);
 270         clk_disable_unprepare(hdmi->clk_tmds);
 271         reset_control_assert(hdmi->rst_ctrl);
 272         gpiod_set_value(hdmi->ddc_en, 0);
 273         regulator_disable(hdmi->regulator);
 274
 275         if (hdmi->ddc_en)
 276                 gpiod_put(hdmi->ddc_en);
 277 }
 278
 279 static const struct component_ops sun8i_dw_hdmi_ops = {
 280         .bind   = sun8i_dw_hdmi_bind,
 281         .unbind = sun8i_dw_hdmi_unbind,
 282 };
 283
 284 static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
 285 {
 286         return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
 287 }
 288
 289 static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
 290 {
 291         component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
 292
 293         return 0;
 294 }
 295
 296 static const struct sun8i_dw_hdmi_quirks sun8i_a83t_quirks = {
 297         .mode_valid = sun8i_dw_hdmi_mode_valid_a83t,
 298         .set_rate = true,
 299 };
 300
 301 static const struct sun8i_dw_hdmi_quirks sun50i_h6_quirks = {
 302         .mode_valid = sun8i_dw_hdmi_mode_valid_h6,
 303         .use_drm_infoframe = true,
 304 };
 305
 306 static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
 307         {
 308                 .compatible = "allwinner,sun8i-a83t-dw-hdmi",
 309                 .data = &sun8i_a83t_quirks,
 310         },
 311         {
 312                 .compatible = "allwinner,sun50i-h6-dw-hdmi",
 313                 .data = &sun50i_h6_quirks,
 314         },
 315         { /* sentinel */ },
 316 };
 317 MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
 318
 319 static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
 320         .probe  = sun8i_dw_hdmi_probe,
 321         .remove = sun8i_dw_hdmi_remove,
 322         .driver = {
 323                 .name = "sun8i-dw-hdmi",
 324                 .of_match_table = sun8i_dw_hdmi_dt_ids,
 325         },
 326 };
 327 module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
 328
 329 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
 330 MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
 331 MODULE_LICENSE("GPL");