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 <[email protected]>
   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_of.h>
  12
  13 #include "tilcdc_drv.h"
  14 #include "tilcdc_external.h"
  15
  16 static const struct tilcdc_panel_info panel_info_tda998x = {
  17                 .ac_bias                = 255,
  18                 .ac_bias_intrpt         = 0,
  19                 .dma_burst_sz           = 16,
  20                 .bpp                    = 16,
  21                 .fdd                    = 0x80,
  22                 .tft_alt_mode           = 0,
  23                 .invert_pxl_clk         = 1,
  24                 .sync_edge              = 1,
  25                 .sync_ctrl              = 1,
  26                 .raster_order           = 0,
  27 };
  28
  29 static const struct tilcdc_panel_info panel_info_default = {
  30                 .ac_bias                = 255,
  31                 .ac_bias_intrpt         = 0,
  32                 .dma_burst_sz           = 16,
  33                 .bpp                    = 16,
  34                 .fdd                    = 0x80,
  35                 .tft_alt_mode           = 0,
  36                 .sync_edge              = 0,
  37                 .sync_ctrl              = 1,
  38                 .raster_order           = 0,
  39 };
  40
  41 static
  42 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
  43                                                     struct drm_encoder *encoder)
  44 {
  45         struct drm_connector *connector;
  46
  47         list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
  48                 if (drm_connector_has_possible_encoder(connector, encoder))
  49                         return connector;
  50         }
  51
  52         dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
  53                 encoder->name, encoder->base.id);
  54
  55         return NULL;
  56 }
  57
  58 int tilcdc_add_component_encoder(struct drm_device *ddev)
  59 {
  60         struct tilcdc_drm_private *priv = ddev->dev_private;
  61         struct drm_encoder *encoder;
  62
  63         list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
  64                 if (encoder->possible_crtcs & (1 << priv->crtc->index))
  65                         break;
  66
  67         if (!encoder) {
  68                 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
  69                 return -ENODEV;
  70         }
  71
  72         priv->external_connector =
  73                 tilcdc_encoder_find_connector(ddev, encoder);
  74
  75         if (!priv->external_connector)
  76                 return -ENODEV;
  77
  78         /* Only tda998x is supported at the moment. */
  79         tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
  80         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
  81
  82         return 0;
  83 }
  84
  85 static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
  86         .destroy        = drm_encoder_cleanup,
  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);
  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_encoder_init(ddev, priv->external_encoder,
 134                                &tilcdc_external_encoder_funcs,
 135                                DRM_MODE_ENCODER_NONE, NULL);
 136         if (ret) {
 137                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 138                 return ret;
 139         }
 140
 141         if (panel) {
 142                 bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
 143                                                    DRM_MODE_CONNECTOR_DPI);
 144                 if (IS_ERR(bridge)) {
 145                         ret = PTR_ERR(bridge);
 146                         goto err_encoder_cleanup;
 147                 }
 148         }
 149
 150         ret = tilcdc_attach_bridge(ddev, bridge);
 151         if (ret)
 152                 goto err_encoder_cleanup;
 153
 154         return 0;
 155
 156 err_encoder_cleanup:
 157         drm_encoder_cleanup(priv->external_encoder);
 158         return ret;
 159 }
 160
 161 static int dev_match_of(struct device *dev, void *data)
 162 {
 163         return dev->of_node == data;
 164 }
 165
 166 int tilcdc_get_external_components(struct device *dev,
 167                                    struct component_match **match)
 168 {
 169         struct device_node *node;
 170
 171         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 172
 173         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 174                 of_node_put(node);
 175                 return 0;
 176         }
 177
 178         if (match)
 179                 drm_of_component_match_add(dev, match, dev_match_of, node);
 180         of_node_put(node);
 181         return 1;
 182 }