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
  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 const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
  90         .destroy        = drm_encoder_cleanup,
  91 };
  92
  93 static
  94 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
  95 {
  96         struct tilcdc_drm_private *priv = ddev->dev_private;
  97         int ret;
  98
  99         priv->external_encoder->possible_crtcs = BIT(0);
 100
 101         ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
 102         if (ret) {
 103                 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
 104                 return ret;
 105         }
 106
 107         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
 108
 109         priv->external_connector =
 110                 tilcdc_encoder_find_connector(ddev, priv->external_encoder);
 111         if (!priv->external_connector)
 112                 return -ENODEV;
 113
 114         return 0;
 115 }
 116
 117 int tilcdc_attach_external_device(struct drm_device *ddev)
 118 {
 119         struct tilcdc_drm_private *priv = ddev->dev_private;
 120         struct drm_bridge *bridge;
 121         struct drm_panel *panel;
 122         int ret;
 123
 124         ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
 125                                           &panel, &bridge);
 126         if (ret == -ENODEV)
 127                 return 0;
 128         else if (ret)
 129                 return ret;
 130
 131         priv->external_encoder = devm_kzalloc(ddev->dev,
 132                                               sizeof(*priv->external_encoder),
 133                                               GFP_KERNEL);
 134         if (!priv->external_encoder)
 135                 return -ENOMEM;
 136
 137         ret = drm_encoder_init(ddev, priv->external_encoder,
 138                                &tilcdc_external_encoder_funcs,
 139                                DRM_MODE_ENCODER_NONE, NULL);
 140         if (ret) {
 141                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 142                 return ret;
 143         }
 144
 145         if (panel) {
 146                 bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
 147                                                    DRM_MODE_CONNECTOR_DPI);
 148                 if (IS_ERR(bridge)) {
 149                         ret = PTR_ERR(bridge);
 150                         goto err_encoder_cleanup;
 151                 }
 152         }
 153
 154         ret = tilcdc_attach_bridge(ddev, bridge);
 155         if (ret)
 156                 goto err_encoder_cleanup;
 157
 158         return 0;
 159
 160 err_encoder_cleanup:
 161         drm_encoder_cleanup(priv->external_encoder);
 162         return ret;
 163 }
 164
 165 static int dev_match_of(struct device *dev, void *data)
 166 {
 167         return dev->of_node == data;
 168 }
 169
 170 int tilcdc_get_external_components(struct device *dev,
 171                                    struct component_match **match)
 172 {
 173         struct device_node *node;
 174
 175         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 176
 177         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 178                 of_node_put(node);
 179                 return 0;
 180         }
 181
 182         if (match)
 183                 drm_of_component_match_add(dev, match, dev_match_of, node);
 184         of_node_put(node);
 185         return 1;
 186 }