drivers/gpu/drm/tilcdc/tilcdc_external.c

   1 /*
   2  * Copyright (C) 2015 Texas Instruments
   3  * Author: Jyri Sarha <jsarha@ti.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  */
  10
  11 #include <linux/component.h>
  12 #include <linux/of_graph.h>
  13 #include <drm/drm_of.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         int i;
  49
  50         list_for_each_entry(connector, &ddev->mode_config.connector_list, head)
  51                 for (i = 0; i < DRM_CONNECTOR_MAX_ENCODER; i++)
  52                         if (connector->encoder_ids[i] == encoder->base.id)
  53                                 return connector;
  54
  55         dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
  56                 encoder->name, encoder->base.id);
  57
  58         return NULL;
  59 }
  60
  61 int tilcdc_add_component_encoder(struct drm_device *ddev)
  62 {
  63         struct tilcdc_drm_private *priv = ddev->dev_private;
  64         struct drm_encoder *encoder = NULL, *iter;
  65
  66         list_for_each_entry(iter, &ddev->mode_config.encoder_list, head)
  67                 if (iter->possible_crtcs & (1 << priv->crtc->index)) {
  68                         encoder = iter;
  69                         break;
  70                 }
  71
  72         if (!encoder) {
  73                 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
  74                 return -ENODEV;
  75         }
  76
  77         priv->external_connector =
  78                 tilcdc_encoder_find_connector(ddev, encoder);
  79
  80         if (!priv->external_connector)
  81                 return -ENODEV;
  82
  83         /* Only tda998x is supported at the moment. */
  84         tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
  85         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
  86
  87         return 0;
  88 }
  89
  90 static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
  91         .destroy        = drm_encoder_cleanup,
  92 };
  93
  94 static
  95 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
  96 {
  97         struct tilcdc_drm_private *priv = ddev->dev_private;
  98         int ret;
  99
 100         priv->external_encoder->possible_crtcs = BIT(0);
 101
 102         ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
 103         if (ret) {
 104                 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
 105                 return ret;
 106         }
 107
 108         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
 109
 110         priv->external_connector =
 111                 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
 112         if (!priv->external_connector)
 113                 return -ENODEV;
 114
 115         return 0;
 116 }
 117
 118 int tilcdc_attach_external_device(struct drm_device *ddev)
 119 {
 120         struct tilcdc_drm_private *priv = ddev->dev_private;
 121         struct device_node *remote_node;
 122         struct drm_bridge *bridge;
 123         int ret;
 124
 125         remote_node = of_graph_get_remote_node(ddev->dev->of_node, 0, 0);
 126         if (!remote_node)
 127                 return 0;
 128
 129         bridge = of_drm_find_bridge(remote_node);
 130         of_node_put(remote_node);
 131         if (!bridge)
 132                 return -EPROBE_DEFER;
 133
 134         priv->external_encoder = devm_kzalloc(ddev->dev,
 135                                               sizeof(*priv->external_encoder),
 136                                               GFP_KERNEL);
 137         if (!priv->external_encoder)
 138                 return -ENOMEM;
 139
 140         ret = drm_encoder_init(ddev, priv->external_encoder,
 141                                &tilcdc_external_encoder_funcs,
 142                                DRM_MODE_ENCODER_NONE, NULL);
 143         if (ret) {
 144                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 145                 return ret;
 146         }
 147
 148         ret = tilcdc_attach_bridge(ddev, bridge);
 149         if (ret)
 150                 drm_encoder_cleanup(priv->external_encoder);
 151
 152         return ret;
 153 }
 154
 155 static int dev_match_of(struct device *dev, void *data)
 156 {
 157         return dev->of_node == data;
 158 }
 159
 160 int tilcdc_get_external_components(struct device *dev,
 161                                    struct component_match **match)
 162 {
 163         struct device_node *node;
 164
 165         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 166
 167         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 168                 of_node_put(node);
 169                 return 0;
 170         }
 171
 172         if (match)
 173                 drm_of_component_match_add(dev, match, dev_match_of, node);
 174         of_node_put(node);
 175         return 1;
 176 }