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 = NULL, *iter;
  64
  65         list_for_each_entry(iter, &ddev->mode_config.encoder_list, head)
  66                 if (iter->possible_crtcs & (1 << priv->crtc->index)) {
  67                         encoder = iter;
  68                         break;
  69                 }
  70
  71         if (!encoder) {
  72                 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
  73                 return -ENODEV;
  74         }
  75
  76         priv->external_connector =
  77                 tilcdc_encoder_find_connector(ddev, encoder);
  78
  79         if (!priv->external_connector)
  80                 return -ENODEV;
  81
  82         /* Only tda998x is supported at the moment. */
  83         tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
  84         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
  85
  86         return 0;
  87 }
  88
  89 static
  90 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
  91 {
  92         struct tilcdc_drm_private *priv = ddev->dev_private;
  93         int ret;
  94
  95         priv->external_encoder->possible_crtcs = BIT(0);
  96
  97         ret = drm_bridge_attach(priv->external_encoder, bridge, NULL, 0);
  98         if (ret) {
  99                 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
 100                 return ret;
 101         }
 102
 103         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
 104
 105         priv->external_connector =
 106                 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
 107         if (!priv->external_connector)
 108                 return -ENODEV;
 109
 110         return 0;
 111 }
 112
 113 int tilcdc_attach_external_device(struct drm_device *ddev)
 114 {
 115         struct tilcdc_drm_private *priv = ddev->dev_private;
 116         struct drm_bridge *bridge;
 117         struct drm_panel *panel;
 118         int ret;
 119
 120         ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
 121                                           &panel, &bridge);
 122         if (ret == -ENODEV)
 123                 return 0;
 124         else if (ret)
 125                 return ret;
 126
 127         priv->external_encoder = devm_kzalloc(ddev->dev,
 128                                               sizeof(*priv->external_encoder),
 129                                               GFP_KERNEL);
 130         if (!priv->external_encoder)
 131                 return -ENOMEM;
 132
 133         ret = drm_simple_encoder_init(ddev, priv->external_encoder,
 134                                       DRM_MODE_ENCODER_NONE);
 135         if (ret) {
 136                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 137                 return ret;
 138         }
 139
 140         if (panel) {
 141                 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
 142                                                          DRM_MODE_CONNECTOR_DPI);
 143                 if (IS_ERR(bridge)) {
 144                         ret = PTR_ERR(bridge);
 145                         goto err_encoder_cleanup;
 146                 }
 147         }
 148
 149         ret = tilcdc_attach_bridge(ddev, bridge);
 150         if (ret)
 151                 goto err_encoder_cleanup;
 152
 153         return 0;
 154
 155 err_encoder_cleanup:
 156         drm_encoder_cleanup(priv->external_encoder);
 157         return ret;
 158 }
 159
 160 static int dev_match_of(struct device *dev, void *data)
 161 {
 162         return dev->of_node == data;
 163 }
 164
 165 int tilcdc_get_external_components(struct device *dev,
 166                                    struct component_match **match)
 167 {
 168         struct device_node *node;
 169
 170         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 171
 172         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 173                 of_node_put(node);
 174                 return 0;
 175         }
 176
 177         if (match)
 178                 drm_of_component_match_add(dev, match, dev_match_of, node);
 179         of_node_put(node);
 180         return 1;
 181 }