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_of.h>
  12 #include <drm/drmP.h>
  13 #include <drm/drm_crtc_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 const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
  34         .destroy = drm_encoder_cleanup,
  35 };
  36
  37 static enum drm_mode_status
  38 sun8i_dw_hdmi_mode_valid_a83t(struct drm_connector *connector,
  39                               const struct drm_display_mode *mode)
  40 {
  41         if (mode->clock > 297000)
  42                 return MODE_CLOCK_HIGH;
  43
  44         return MODE_OK;
  45 }
  46
  47 static enum drm_mode_status
  48 sun8i_dw_hdmi_mode_valid_h6(struct drm_connector *connector,
  49                             const struct drm_display_mode *mode)
  50 {
  51         /* This is max for HDMI 2.0b (4K@60Hz) */
  52         if (mode->clock > 594000)
  53                 return MODE_CLOCK_HIGH;
  54
  55         return MODE_OK;
  56 }
  57
  58 static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
  59 {
  60         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
  61                 !!of_match_node(sun8i_tcon_top_of_table, node);
  62 }
  63
  64 static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
  65                                              struct device_node *node)
  66 {
  67         struct device_node *port, *ep, *remote, *remote_port;
  68         u32 crtcs = 0;
  69
  70         remote = of_graph_get_remote_node(node, 0, -1);
  71         if (!remote)
  72                 return 0;
  73
  74         if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
  75                 port = of_graph_get_port_by_id(remote, 4);
  76                 if (!port)
  77                         goto crtcs_exit;
  78
  79                 for_each_child_of_node(port, ep) {
  80                         remote_port = of_graph_get_remote_port(ep);
  81                         if (remote_port) {
  82                                 crtcs |= drm_of_crtc_port_mask(drm, remote_port);
  83                                 of_node_put(remote_port);
  84                         }
  85                 }
  86         } else {
  87                 crtcs = drm_of_find_possible_crtcs(drm, node);
  88         }
  89
  90 crtcs_exit:
  91         of_node_put(remote);
  92
  93         return crtcs;
  94 }
  95
  96 static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
  97                               void *data)
  98 {
  99         struct platform_device *pdev = to_platform_device(dev);
 100         struct dw_hdmi_plat_data *plat_data;
 101         struct drm_device *drm = data;
 102         struct device_node *phy_node;
 103         struct drm_encoder *encoder;
 104         struct sun8i_dw_hdmi *hdmi;
 105         int ret;
 106
 107         if (!pdev->dev.of_node)
 108                 return -ENODEV;
 109
 110         hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
 111         if (!hdmi)
 112                 return -ENOMEM;
 113
 114         plat_data = &hdmi->plat_data;
 115         hdmi->dev = &pdev->dev;
 116         encoder = &hdmi->encoder;
 117
 118         hdmi->quirks = of_device_get_match_data(dev);
 119
 120         encoder->possible_crtcs =
 121                 sun8i_dw_hdmi_find_possible_crtcs(drm, dev->of_node);
 122         /*
 123          * If we failed to find the CRTC(s) which this encoder is
 124          * supposed to be connected to, it's because the CRTC has
 125          * not been registered yet.  Defer probing, and hope that
 126          * the required CRTC is added later.
 127          */
 128         if (encoder->possible_crtcs == 0)
 129                 return -EPROBE_DEFER;
 130
 131         hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
 132         if (IS_ERR(hdmi->rst_ctrl)) {
 133                 dev_err(dev, "Could not get ctrl reset control\n");
 134                 return PTR_ERR(hdmi->rst_ctrl);
 135         }
 136
 137         hdmi->clk_tmds = devm_clk_get(dev, "tmds");
 138         if (IS_ERR(hdmi->clk_tmds)) {
 139                 dev_err(dev, "Couldn't get the tmds clock\n");
 140                 return PTR_ERR(hdmi->clk_tmds);
 141         }
 142
 143         hdmi->regulator = devm_regulator_get(dev, "hvcc");
 144         if (IS_ERR(hdmi->regulator)) {
 145                 dev_err(dev, "Couldn't get regulator\n");
 146                 return PTR_ERR(hdmi->regulator);
 147         }
 148
 149         ret = regulator_enable(hdmi->regulator);
 150         if (ret) {
 151                 dev_err(dev, "Failed to enable regulator\n");
 152                 return ret;
 153         }
 154
 155         ret = reset_control_deassert(hdmi->rst_ctrl);
 156         if (ret) {
 157                 dev_err(dev, "Could not deassert ctrl reset control\n");
 158                 goto err_disable_regulator;
 159         }
 160
 161         ret = clk_prepare_enable(hdmi->clk_tmds);
 162         if (ret) {
 163                 dev_err(dev, "Could not enable tmds clock\n");
 164                 goto err_assert_ctrl_reset;
 165         }
 166
 167         phy_node = of_parse_phandle(dev->of_node, "phys", 0);
 168         if (!phy_node) {
 169                 dev_err(dev, "Can't found PHY phandle\n");
 170                 goto err_disable_clk_tmds;
 171         }
 172
 173         ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
 174         of_node_put(phy_node);
 175         if (ret) {
 176                 dev_err(dev, "Couldn't get the HDMI PHY\n");
 177                 goto err_disable_clk_tmds;
 178         }
 179
 180         drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
 181         drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
 182                          DRM_MODE_ENCODER_TMDS, NULL);
 183
 184         sun8i_hdmi_phy_init(hdmi->phy);
 185
 186         plat_data->mode_valid = hdmi->quirks->mode_valid;
 187         plat_data->phy_ops = sun8i_hdmi_phy_get_ops();
 188         plat_data->phy_name = "sun8i_dw_hdmi_phy";
 189         plat_data->phy_data = hdmi->phy;
 190
 191         platform_set_drvdata(pdev, hdmi);
 192
 193         hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
 194
 195         /*
 196          * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
 197          * which would have called the encoder cleanup.  Do it manually.
 198          */
 199         if (IS_ERR(hdmi->hdmi)) {
 200                 ret = PTR_ERR(hdmi->hdmi);
 201                 goto cleanup_encoder;
 202         }
 203
 204         return 0;
 205
 206 cleanup_encoder:
 207         drm_encoder_cleanup(encoder);
 208         sun8i_hdmi_phy_remove(hdmi);
 209 err_disable_clk_tmds:
 210         clk_disable_unprepare(hdmi->clk_tmds);
 211 err_assert_ctrl_reset:
 212         reset_control_assert(hdmi->rst_ctrl);
 213 err_disable_regulator:
 214         regulator_disable(hdmi->regulator);
 215
 216         return ret;
 217 }
 218
 219 static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
 220                                  void *data)
 221 {
 222         struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
 223
 224         dw_hdmi_unbind(hdmi->hdmi);
 225         sun8i_hdmi_phy_remove(hdmi);
 226         clk_disable_unprepare(hdmi->clk_tmds);
 227         reset_control_assert(hdmi->rst_ctrl);
 228         regulator_disable(hdmi->regulator);
 229 }
 230
 231 static const struct component_ops sun8i_dw_hdmi_ops = {
 232         .bind   = sun8i_dw_hdmi_bind,
 233         .unbind = sun8i_dw_hdmi_unbind,
 234 };
 235
 236 static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
 237 {
 238         return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
 239 }
 240
 241 static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
 242 {
 243         component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
 244
 245         return 0;
 246 }
 247
 248 static const struct sun8i_dw_hdmi_quirks sun8i_a83t_quirks = {
 249         .mode_valid = sun8i_dw_hdmi_mode_valid_a83t,
 250         .set_rate = true,
 251 };
 252
 253 static const struct sun8i_dw_hdmi_quirks sun50i_h6_quirks = {
 254         .mode_valid = sun8i_dw_hdmi_mode_valid_h6,
 255 };
 256
 257 static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
 258         {
 259                 .compatible = "allwinner,sun8i-a83t-dw-hdmi",
 260                 .data = &sun8i_a83t_quirks,
 261         },
 262         {
 263                 .compatible = "allwinner,sun50i-h6-dw-hdmi",
 264                 .data = &sun50i_h6_quirks,
 265         },
 266         { /* sentinel */ },
 267 };
 268 MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
 269
 270 static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
 271         .probe  = sun8i_dw_hdmi_probe,
 272         .remove = sun8i_dw_hdmi_remove,
 273         .driver = {
 274                 .name = "sun8i-dw-hdmi",
 275                 .of_match_table = sun8i_dw_hdmi_dt_ids,
 276         },
 277 };
 278 module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
 279
 280 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
 281 MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
 282 MODULE_LICENSE("GPL");