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 int tilcdc_external_mode_valid(struct drm_connector *connector,
  44                                       struct drm_display_mode *mode)
  45 {
  46         struct tilcdc_drm_private *priv = connector->dev->dev_private;
  47         int ret;
  48
  49         ret = tilcdc_crtc_mode_valid(priv->crtc, mode);
  50         if (ret != MODE_OK)
  51                 return ret;
  52
  53         BUG_ON(priv->external_connector != connector);
  54         BUG_ON(!priv->connector_funcs);
  55
  56         /* If the connector has its own mode_valid call it. */
  57         if (!IS_ERR(priv->connector_funcs) &&
  58             priv->connector_funcs->mode_valid)
  59                 return priv->connector_funcs->mode_valid(connector, mode);
  60
  61         return MODE_OK;
  62 }
  63
  64 static int tilcdc_add_external_connector(struct drm_device *dev,
  65                                          struct drm_connector *connector)
  66 {
  67         struct tilcdc_drm_private *priv = dev->dev_private;
  68         struct drm_connector_helper_funcs *connector_funcs;
  69
  70         /* There should never be more than one connector */
  71         if (WARN_ON(priv->external_connector))
  72                 return -EINVAL;
  73
  74         priv->external_connector = connector;
  75         connector_funcs = devm_kzalloc(dev->dev, sizeof(*connector_funcs),
  76                                        GFP_KERNEL);
  77         if (!connector_funcs)
  78                 return -ENOMEM;
  79
  80         /* connector->helper_private contains always struct
  81          * connector_helper_funcs pointer. For tilcdc crtc to have a
  82          * say if a specific mode is Ok, we need to install our own
  83          * helper functions. In our helper functions we copy
  84          * everything else but use our own mode_valid() (above).
  85          */
  86         if (connector->helper_private) {
  87                 priv->connector_funcs = connector->helper_private;
  88                 *connector_funcs = *priv->connector_funcs;
  89         } else {
  90                 priv->connector_funcs = ERR_PTR(-ENOENT);
  91         }
  92         connector_funcs->mode_valid = tilcdc_external_mode_valid;
  93         drm_connector_helper_add(connector, connector_funcs);
  94
  95         dev_dbg(dev->dev, "External connector '%s' connected\n",
  96                 connector->name);
  97
  98         return 0;
  99 }
 100
 101 static
 102 struct drm_connector *tilcdc_encoder_find_connector(struct drm_device *ddev,
 103                                                     struct drm_encoder *encoder)
 104 {
 105         struct drm_connector *connector;
 106
 107         list_for_each_entry(connector, &ddev->mode_config.connector_list, head) {
 108                 if (drm_connector_has_possible_encoder(connector, encoder))
 109                         return connector;
 110         }
 111
 112         dev_err(ddev->dev, "No connector found for %s encoder (id %d)\n",
 113                 encoder->name, encoder->base.id);
 114
 115         return NULL;
 116 }
 117
 118 int tilcdc_add_component_encoder(struct drm_device *ddev)
 119 {
 120         struct tilcdc_drm_private *priv = ddev->dev_private;
 121         struct drm_connector *connector;
 122         struct drm_encoder *encoder;
 123
 124         list_for_each_entry(encoder, &ddev->mode_config.encoder_list, head)
 125                 if (encoder->possible_crtcs & (1 << priv->crtc->index))
 126                         break;
 127
 128         if (!encoder) {
 129                 dev_err(ddev->dev, "%s: No suitable encoder found\n", __func__);
 130                 return -ENODEV;
 131         }
 132
 133         connector = tilcdc_encoder_find_connector(ddev, encoder);
 134
 135         if (!connector)
 136                 return -ENODEV;
 137
 138         /* Only tda998x is supported at the moment. */
 139         tilcdc_crtc_set_simulate_vesa_sync(priv->crtc, true);
 140         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_tda998x);
 141
 142         return tilcdc_add_external_connector(ddev, connector);
 143 }
 144
 145 void tilcdc_remove_external_device(struct drm_device *dev)
 146 {
 147         struct tilcdc_drm_private *priv = dev->dev_private;
 148
 149         /* Restore the original helper functions, if any. */
 150         if (IS_ERR(priv->connector_funcs))
 151                 drm_connector_helper_add(priv->external_connector, NULL);
 152         else if (priv->connector_funcs)
 153                 drm_connector_helper_add(priv->external_connector,
 154                                          priv->connector_funcs);
 155 }
 156
 157 static const struct drm_encoder_funcs tilcdc_external_encoder_funcs = {
 158         .destroy        = drm_encoder_cleanup,
 159 };
 160
 161 static
 162 int tilcdc_attach_bridge(struct drm_device *ddev, struct drm_bridge *bridge)
 163 {
 164         struct tilcdc_drm_private *priv = ddev->dev_private;
 165         struct drm_connector *connector;
 166         int ret;
 167
 168         priv->external_encoder->possible_crtcs = BIT(0);
 169
 170         ret = drm_bridge_attach(priv->external_encoder, bridge, NULL);
 171         if (ret) {
 172                 dev_err(ddev->dev, "drm_bridge_attach() failed %d\n", ret);
 173                 return ret;
 174         }
 175
 176         tilcdc_crtc_set_panel_info(priv->crtc, &panel_info_default);
 177
 178         connector = tilcdc_encoder_find_connector(ddev, priv->external_encoder);
 179         if (!connector)
 180                 return -ENODEV;
 181
 182         ret = tilcdc_add_external_connector(ddev, connector);
 183
 184         return ret;
 185 }
 186
 187 int tilcdc_attach_external_device(struct drm_device *ddev)
 188 {
 189         struct tilcdc_drm_private *priv = ddev->dev_private;
 190         struct drm_bridge *bridge;
 191         struct drm_panel *panel;
 192         int ret;
 193
 194         ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
 195                                           &panel, &bridge);
 196         if (ret == -ENODEV)
 197                 return 0;
 198         else if (ret)
 199                 return ret;
 200
 201         priv->external_encoder = devm_kzalloc(ddev->dev,
 202                                               sizeof(*priv->external_encoder),
 203                                               GFP_KERNEL);
 204         if (!priv->external_encoder)
 205                 return -ENOMEM;
 206
 207         ret = drm_encoder_init(ddev, priv->external_encoder,
 208                                &tilcdc_external_encoder_funcs,
 209                                DRM_MODE_ENCODER_NONE, NULL);
 210         if (ret) {
 211                 dev_err(ddev->dev, "drm_encoder_init() failed %d\n", ret);
 212                 return ret;
 213         }
 214
 215         if (panel) {
 216                 bridge = devm_drm_panel_bridge_add(ddev->dev, panel,
 217                                                    DRM_MODE_CONNECTOR_DPI);
 218                 if (IS_ERR(bridge)) {
 219                         ret = PTR_ERR(bridge);
 220                         goto err_encoder_cleanup;
 221                 }
 222         }
 223
 224         ret = tilcdc_attach_bridge(ddev, bridge);
 225         if (ret)
 226                 goto err_encoder_cleanup;
 227
 228         return 0;
 229
 230 err_encoder_cleanup:
 231         drm_encoder_cleanup(priv->external_encoder);
 232         return ret;
 233 }
 234
 235 static int dev_match_of(struct device *dev, void *data)
 236 {
 237         return dev->of_node == data;
 238 }
 239
 240 int tilcdc_get_external_components(struct device *dev,
 241                                    struct component_match **match)
 242 {
 243         struct device_node *node;
 244
 245         node = of_graph_get_remote_node(dev->of_node, 0, 0);
 246
 247         if (!of_device_is_compatible(node, "nxp,tda998x")) {
 248                 of_node_put(node);
 249                 return 0;
 250         }
 251
 252         if (match)
 253                 drm_of_component_match_add(dev, match, dev_match_of, node);
 254         of_node_put(node);
 255         return 1;
 256 }