drivers/gpu/drm/tilcdc/tilcdc_external.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2015 Texas Instruments
   4  * Author: Jyri Sarha <jsarha@ti.com>
   5  */
   6
   7 #include <linux/component.h>
   8 #include <linux/of_graph.h>
   9
  10 #include <drm/drm_atomic_helper.h>
  11 #include <drm/drm_bridge.h>
  12 #include <drm/drm_of.h>
  13 #include <drm/drm_simple_kms_helper.h>
  14
  15 #include "tilcdc_drv.h"
  16 #include "tilcdc_external.h"
  17
  18 static const struct tilcdc_panel_info panel_info_tda998x = {
  19                 .ac_bias                = 255,
  20                 .ac_bias_intrpt         = 0,
  21                 .dma_burst_sz           = 16,
  22                 .bpp                    = 16,
  23                 .fdd                    = 0x80,
  24                 .tft_alt_mode           = 0,
  25                 .invert_pxl_clk         = 1,
  26                 .sync_edge              = 1,
  27                 .sync_ctrl              = 1,
  28                 .raster_order           = 0,
  29 };
  30
  31 static const struct tilcdc_panel_info panel_info_default = {
  32                 .ac_bias                = 255,
  33                 .ac_bias_intrpt         = 0,
  34                 .dma_burst_sz           = 16,
  35                 .bpp                    = 16,
  36                 .fdd                    = 0x80,
  37                 .tft_alt_mode           = 0,
  38                 .sync_edge              = 0,
  39                 .sync_ctrl              = 1,
  40                 .raster_order           = 0,
  41 };
  42
  43 static
  44 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
  45                                                     struct drm_encoder *encoder)
  46 {
  47         struct drm_connector *connector;
  48
  49         list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
  50                 if (drm_connector_has_possible_encoder(connector, encoder))
  51                         return connector;
  52         }
  53
  54         dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
  55                 encoder->name, encoder->base.id);
  56
  57         return NULL;
  58 }
  59
  60 int tilcdc_add_component_encoder(struct drm_device *ddev)
  61 {
  62         struct tilcdc_drm_private *priv = ddev->dev_private;
  63         struct drm_encoder *encoder;
  64
  65         list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
  66                 if (encoder->possible_crtcs & (1 << priv->crtc->index))
  67                         break;
  68
  69         if (!encoder) {
  70                 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
  71                 return -ENODEV;
  72         }
  73
  74         priv->external_connector =
  75                 tilcdc_encoder_find_connector(ddev, encoder);
  76
  77         if (!priv->external_connector)
  78                 return -ENODEV;
  79
  80         /* Only tda998x is supported at the moment. */
  81         tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
  82         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
  83
  84         return 0;
  85 }
  86
  87 static
  88 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
  89 {
  90         struct tilcdc_drm_private *priv = ddev->dev_private;
  91         int ret;
  92
  93         priv->external_encoder->possible_crtcs = BIT(0);
  94
  95         ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0);
  96         if (ret)
  97                 return ret;
  98
  99         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
 100
 101         priv->external_connector =
 102                 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
 103         if (!priv->external_connector)
 104                 return -ENODEV;
 105
 106         return 0;
 107 }
 108
 109 int tilcdc_attach_external_device(struct drm_device *ddev)
 110 {
 111         struct tilcdc_drm_private *priv = ddev->dev_private;
 112         struct drm_bridge *bridge;
 113         struct drm_panel *panel;
 114         int ret;
 115
 116         ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
 117                                           &panel, &bridge);
 118         if (ret == -ENODEV)
 119                 return 0;
 120         else if (ret)
 121                 return ret;
 122
 123         priv->external_encoder = devm_kzalloc(ddev->dev,
 124                                               sizeof(*priv->external_encoder),
 125                                               GFP_KERNEL);
 126         if (!priv->external_encoder)
 127                 return -ENOMEM;
 128
 129         ret = drm_simple_encoder_init(ddev, priv->external_encoder,
 130                                       DRM_MODE_ENCODER_NONE);
 131         if (ret) {
 132                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 133                 return ret;
 134         }
 135
 136         if (panel) {
 137                 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
 138                                                          DRM_MODE_CONNECTOR_DPI);
 139                 if (IS_ERR(bridge)) {
 140                         ret = PTR_ERR(bridge);
 141                         goto err_encoder_cleanup;
 142                 }
 143         }
 144
 145         ret = tilcdc_attach_bridge(ddev, bridge);
 146         if (ret)
 147                 goto err_encoder_cleanup;
 148
 149         return 0;
 150
 151 err_encoder_cleanup:
 152         drm_encoder_cleanup(priv->external_encoder);
 153         return ret;
 154 }
 155
 156 static int dev_match_of(struct device *dev, void *data)
 157 {
 158         return dev->of_node == data;
 159 }
 160
 161 int tilcdc_get_external_components(struct device *dev,
 162                                    struct component_match **match)
 163 {
 164         struct device_node *node;
 165
 166         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 167
 168         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 169                 of_node_put(node);
 170                 return 0;
 171         }
 172
 173         if (match)
 174                 drm_of_component_match_add(dev, match, dev_match_of, node);
 175         of_node_put(node);
 176         return 1;
 177 }