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/platform_device.h>
   9
  10 #include <drm/drm_of.h>
  11 #include <drm/drmP.h>
  12 #include <drm/drm_crtc_helper.h>
  13
  14 #include "sun8i_dw_hdmi.h"
  15 #include "sun8i_tcon_top.h"
  16
  17 static void sun8i_dw_hdmi_encoder_mode_set(struct drm_encoder *encoder,
  18                                            struct drm_display_mode *mode,
  19                                            struct drm_display_mode *adj_mode)
  20 {
  21         struct sun8i_dw_hdmi *hdmi = encoder_to_sun8i_dw_hdmi(encoder);
  22
  23         clk_set_rate(hdmi->clk_tmds, mode->crtc_clock * 1000);
  24 }
  25
  26 static const struct drm_encoder_helper_funcs
  27 sun8i_dw_hdmi_encoder_helper_funcs = {
  28         .mode_set = sun8i_dw_hdmi_encoder_mode_set,
  29 };
  30
  31 static const struct drm_encoder_funcs sun8i_dw_hdmi_encoder_funcs = {
  32         .destroy = drm_encoder_cleanup,
  33 };
  34
  35 static enum drm_mode_status
  36 sun8i_dw_hdmi_mode_valid(struct drm_connector *connector,
  37                          const struct drm_display_mode *mode)
  38 {
  39         if (mode->clock > 297000)
  40                 return MODE_CLOCK_HIGH;
  41
  42         return MODE_OK;
  43 }
  44
  45 static bool sun8i_dw_hdmi_node_is_tcon_top(struct device_node *node)
  46 {
  47         return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
  48                 !!of_match_node(sun8i_tcon_top_of_table, node);
  49 }
  50
  51 static u32 sun8i_dw_hdmi_find_possible_crtcs(struct drm_device *drm,
  52                                              struct device_node *node)
  53 {
  54         struct device_node *port, *ep, *remote, *remote_port;
  55         u32 crtcs = 0;
  56
  57         remote = of_graph_get_remote_node(node, 0, -1);
  58         if (!remote)
  59                 return 0;
  60
  61         if (sun8i_dw_hdmi_node_is_tcon_top(remote)) {
  62                 port = of_graph_get_port_by_id(remote, 4);
  63                 if (!port)
  64                         goto crtcs_exit;
  65
  66                 for_each_child_of_node(port, ep) {
  67                         remote_port = of_graph_get_remote_port(ep);
  68                         if (remote_port) {
  69                                 crtcs |= drm_of_crtc_port_mask(drm, remote_port);
  70                                 of_node_put(remote_port);
  71                         }
  72                 }
  73         } else {
  74                 crtcs = drm_of_find_possible_crtcs(drm, node);
  75         }
  76
  77 crtcs_exit:
  78         of_node_put(remote);
  79
  80         return crtcs;
  81 }
  82
  83 static int sun8i_dw_hdmi_bind(struct device *dev, struct device *master,
  84                               void *data)
  85 {
  86         struct platform_device *pdev = to_platform_device(dev);
  87         struct dw_hdmi_plat_data *plat_data;
  88         struct drm_device *drm = data;
  89         struct device_node *phy_node;
  90         struct drm_encoder *encoder;
  91         struct sun8i_dw_hdmi *hdmi;
  92         int ret;
  93
  94         if (!pdev->dev.of_node)
  95                 return -ENODEV;
  96
  97         hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
  98         if (!hdmi)
  99                 return -ENOMEM;
 100
 101         plat_data = &hdmi->plat_data;
 102         hdmi->dev = &pdev->dev;
 103         encoder = &hdmi->encoder;
 104
 105         encoder->possible_crtcs =
 106                 sun8i_dw_hdmi_find_possible_crtcs(drm, dev->of_node);
 107         /*
 108          * If we failed to find the CRTC(s) which this encoder is
 109          * supposed to be connected to, it's because the CRTC has
 110          * not been registered yet.  Defer probing, and hope that
 111          * the required CRTC is added later.
 112          */
 113         if (encoder->possible_crtcs == 0)
 114                 return -EPROBE_DEFER;
 115
 116         hdmi->rst_ctrl = devm_reset_control_get(dev, "ctrl");
 117         if (IS_ERR(hdmi->rst_ctrl)) {
 118                 dev_err(dev, "Could not get ctrl reset control\n");
 119                 return PTR_ERR(hdmi->rst_ctrl);
 120         }
 121
 122         hdmi->clk_tmds = devm_clk_get(dev, "tmds");
 123         if (IS_ERR(hdmi->clk_tmds)) {
 124                 dev_err(dev, "Couldn't get the tmds clock\n");
 125                 return PTR_ERR(hdmi->clk_tmds);
 126         }
 127
 128         ret = reset_control_deassert(hdmi->rst_ctrl);
 129         if (ret) {
 130                 dev_err(dev, "Could not deassert ctrl reset control\n");
 131                 return ret;
 132         }
 133
 134         ret = clk_prepare_enable(hdmi->clk_tmds);
 135         if (ret) {
 136                 dev_err(dev, "Could not enable tmds clock\n");
 137                 goto err_assert_ctrl_reset;
 138         }
 139
 140         phy_node = of_parse_phandle(dev->of_node, "phys", 0);
 141         if (!phy_node) {
 142                 dev_err(dev, "Can't found PHY phandle\n");
 143                 ret = -EINVAL;
 144                 goto err_disable_clk_tmds;
 145         }
 146
 147         ret = sun8i_hdmi_phy_probe(hdmi, phy_node);
 148         of_node_put(phy_node);
 149         if (ret) {
 150                 dev_err(dev, "Couldn't get the HDMI PHY\n");
 151                 goto err_disable_clk_tmds;
 152         }
 153
 154         drm_encoder_helper_add(encoder, &sun8i_dw_hdmi_encoder_helper_funcs);
 155         drm_encoder_init(drm, encoder, &sun8i_dw_hdmi_encoder_funcs,
 156                          DRM_MODE_ENCODER_TMDS, NULL);
 157
 158         sun8i_hdmi_phy_init(hdmi->phy);
 159
 160         plat_data->mode_valid = &sun8i_dw_hdmi_mode_valid;
 161         plat_data->phy_ops = sun8i_hdmi_phy_get_ops();
 162         plat_data->phy_name = "sun8i_dw_hdmi_phy";
 163         plat_data->phy_data = hdmi->phy;
 164
 165         platform_set_drvdata(pdev, hdmi);
 166
 167         hdmi->hdmi = dw_hdmi_bind(pdev, encoder, plat_data);
 168
 169         /*
 170          * If dw_hdmi_bind() fails we'll never call dw_hdmi_unbind(),
 171          * which would have called the encoder cleanup.  Do it manually.
 172          */
 173         if (IS_ERR(hdmi->hdmi)) {
 174                 ret = PTR_ERR(hdmi->hdmi);
 175                 goto cleanup_encoder;
 176         }
 177
 178         return 0;
 179
 180 cleanup_encoder:
 181         drm_encoder_cleanup(encoder);
 182         sun8i_hdmi_phy_remove(hdmi);
 183 err_disable_clk_tmds:
 184         clk_disable_unprepare(hdmi->clk_tmds);
 185 err_assert_ctrl_reset:
 186         reset_control_assert(hdmi->rst_ctrl);
 187
 188         return ret;
 189 }
 190
 191 static void sun8i_dw_hdmi_unbind(struct device *dev, struct device *master,
 192                                  void *data)
 193 {
 194         struct sun8i_dw_hdmi *hdmi = dev_get_drvdata(dev);
 195
 196         dw_hdmi_unbind(hdmi->hdmi);
 197         sun8i_hdmi_phy_remove(hdmi);
 198         clk_disable_unprepare(hdmi->clk_tmds);
 199         reset_control_assert(hdmi->rst_ctrl);
 200 }
 201
 202 static const struct component_ops sun8i_dw_hdmi_ops = {
 203         .bind   = sun8i_dw_hdmi_bind,
 204         .unbind = sun8i_dw_hdmi_unbind,
 205 };
 206
 207 static int sun8i_dw_hdmi_probe(struct platform_device *pdev)
 208 {
 209         return component_add(&pdev->dev, &sun8i_dw_hdmi_ops);
 210 }
 211
 212 static int sun8i_dw_hdmi_remove(struct platform_device *pdev)
 213 {
 214         component_del(&pdev->dev, &sun8i_dw_hdmi_ops);
 215
 216         return 0;
 217 }
 218
 219 static const struct of_device_id sun8i_dw_hdmi_dt_ids[] = {
 220         { .compatible = "allwinner,sun8i-a83t-dw-hdmi" },
 221         { /* sentinel */ },
 222 };
 223 MODULE_DEVICE_TABLE(of, sun8i_dw_hdmi_dt_ids);
 224
 225 static struct platform_driver sun8i_dw_hdmi_pltfm_driver = {
 226         .probe  = sun8i_dw_hdmi_probe,
 227         .remove = sun8i_dw_hdmi_remove,
 228         .driver = {
 229                 .name = "sun8i-dw-hdmi",
 230                 .of_match_table = sun8i_dw_hdmi_dt_ids,
 231         },
 232 };
 233 module_platform_driver(sun8i_dw_hdmi_pltfm_driver);
 234
 235 MODULE_AUTHOR("Jernej Skrabec <jernej.skrabec@siol.net>");
 236 MODULE_DESCRIPTION("Allwinner DW HDMI bridge");
 237 MODULE_LICENSE("GPL");