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_bridge.h>
  12 #include <drm/drm_of.h>
  13
  14 #include "tilcdc_drv.h"
  15 #include "tilcdc_external.h"
  16
  17 static const struct tilcdc_panel_info panel_info_tda998x = {
  18                 .ac_bias                = 255,
  19                 .ac_bias_intrpt         = 0,
  20                 .dma_burst_sz           = 16,
  21                 .bpp                    = 16,
  22                 .fdd                    = 0x80,
  23                 .tft_alt_mode           = 0,
  24                 .invert_pxl_clk         = 1,
  25                 .sync_edge              = 1,
  26                 .sync_ctrl              = 1,
  27                 .raster_order           = 0,
  28 };
  29
  30 static const struct tilcdc_panel_info panel_info_default = {
  31                 .ac_bias                = 255,
  32                 .ac_bias_intrpt         = 0,
  33                 .dma_burst_sz           = 16,
  34                 .bpp                    = 16,
  35                 .fdd                    = 0x80,
  36                 .tft_alt_mode           = 0,
  37                 .sync_edge              = 0,
  38                 .sync_ctrl              = 1,
  39                 .raster_order           = 0,
  40 };
  41
  42 static
  43 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
  44                                                     struct drm_encoder *encoder)
  45 {
  46         struct drm_connector *connector;
  47
  48         list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
  49                 if (drm_connector_has_possible_encoder(connector, encoder))
  50                         return connector;
  51         }
  52
  53         dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
  54                 encoder->name, encoder->base.id);
  55
  56         return NULL;
  57 }
  58
  59 int tilcdc_add_component_encoder(struct drm_device *ddev)
  60 {
  61         struct tilcdc_drm_private *priv = ddev->dev_private;
  62         struct drm_encoder *encoder;
  63
  64         list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
  65                 if (encoder->possible_crtcs & (1 << priv->crtc->index))
  66                         break;
  67
  68         if (!encoder) {
  69                 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
  70                 return -ENODEV;
  71         }
  72
  73         priv->external_connector =
  74                 tilcdc_encoder_find_connector(ddev, encoder);
  75
  76         if (!priv->external_connector)
  77                 return -ENODEV;
  78
  79         /* Only tda998x is supported at the moment. */
  80         tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
  81         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
  82
  83         return 0;
  84 }
  85
  86 static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
  87         .destroy        = drm_encoder_cleanup,
  88 };
  89
  90 static
  91 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
  92 {
  93         struct tilcdc_drm_private *priv = ddev->dev_private;
  94         int ret;
  95
  96         priv->external_encoder->possible_crtcs = BIT(0);
  97
  98         ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
  99         if (ret) {
 100                 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
 101                 return ret;
 102         }
 103
 104         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
 105
 106         priv->external_connector =
 107                 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
 108         if (!priv->external_connector)
 109                 return -ENODEV;
 110
 111         return 0;
 112 }
 113
 114 int tilcdc_attach_external_device(struct drm_device *ddev)
 115 {
 116         struct tilcdc_drm_private *priv = ddev->dev_private;
 117         struct drm_bridge *bridge;
 118         struct drm_panel *panel;
 119         int ret;
 120
 121         ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
 122                                           &panel, &bridge);
 123         if (ret == -ENODEV)
 124                 return 0;
 125         else if (ret)
 126                 return ret;
 127
 128         priv->external_encoder = devm_kzalloc(ddev->dev,
 129                                               sizeof(*priv->external_encoder),
 130                                               GFP_KERNEL);
 131         if (!priv->external_encoder)
 132                 return -ENOMEM;
 133
 134         ret = drm_encoder_init(ddev, priv->external_encoder,
 135                                &tilcdc_external_encoder_funcs,
 136                                DRM_MODE_ENCODER_NONE, NULL);
 137         if (ret) {
 138                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 139                 return ret;
 140         }
 141
 142         if (panel) {
 143                 bridge = devm_drm_panel_bridge_add_typed(ddev->dev, panel,
 144                                                          DRM_MODE_CONNECTOR_DPI);
 145                 if (IS_ERR(bridge)) {
 146                         ret = PTR_ERR(bridge);
 147                         goto err_encoder_cleanup;
 148                 }
 149         }
 150
 151         ret = tilcdc_attach_bridge(ddev, bridge);
 152         if (ret)
 153                 goto err_encoder_cleanup;
 154
 155         return 0;
 156
 157 err_encoder_cleanup:
 158         drm_encoder_cleanup(priv->external_encoder);
 159         return ret;
 160 }
 161
 162 static int dev_match_of(struct device *dev, void *data)
 163 {
 164         return dev->of_node == data;
 165 }
 166
 167 int tilcdc_get_external_components(struct device *dev,
 168                                    struct component_match **match)
 169 {
 170         struct device_node *node;
 171
 172         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 173
 174         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 175                 of_node_put(node);
 176                 return 0;
 177         }
 178
 179         if (match)
 180                 drm_of_component_match_add(dev, match, dev_match_of, node);
 181         of_node_put(node);
 182         return 1;
 183 }