drivers/gpu/drm/rcar-du/rcar_du_encoder.c

   1 /*
   2  * rcar_du_encoder.c  --  R-Car Display Unit Encoder
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/export.h>
  15
  16 #include <drm/drmP.h>
  17 #include <drm/drm_crtc.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_panel.h>
  20
  21 #include "rcar_du_drv.h"
  22 #include "rcar_du_encoder.h"
  23 #include "rcar_du_kms.h"
  24 #include "rcar_du_lvdscon.h"
  25 #include "rcar_du_lvdsenc.h"
  26
  27 /* -----------------------------------------------------------------------------
  28  * Encoder
  29  */
  30
  31 static void rcar_du_encoder_disable(struct drm_encoder *encoder)
  32 {
  33         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  34
  35         if (renc->connector && renc->connector->panel) {
  36                 drm_panel_disable(renc->connector->panel);
  37                 drm_panel_unprepare(renc->connector->panel);
  38         }
  39
  40         if (renc->lvds)
  41                 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
  42 }
  43
  44 static void rcar_du_encoder_enable(struct drm_encoder *encoder)
  45 {
  46         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  47
  48         if (renc->lvds)
  49                 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
  50
  51         if (renc->connector && renc->connector->panel) {
  52                 drm_panel_prepare(renc->connector->panel);
  53                 drm_panel_enable(renc->connector->panel);
  54         }
  55 }
  56
  57 static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
  58                                         struct drm_crtc_state *crtc_state,
  59                                         struct drm_connector_state *conn_state)
  60 {
  61         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  62         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
  63         const struct drm_display_mode *mode = &crtc_state->mode;
  64         struct drm_connector *connector = conn_state->connector;
  65         struct drm_device *dev = encoder->dev;
  66
  67         /*
  68          * Only panel-related encoder types require validation here, everything
  69          * else is handled by the bridge drivers.
  70          */
  71         if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
  72                 const struct drm_display_mode *panel_mode;
  73
  74                 if (list_empty(&connector->modes)) {
  75                         dev_dbg(dev->dev, "encoder: empty modes list\n");
  76                         return -EINVAL;
  77                 }
  78
  79                 panel_mode = list_first_entry(&connector->modes,
  80                                               struct drm_display_mode, head);
  81
  82                 /* We're not allowed to modify the resolution. */
  83                 if (mode->hdisplay != panel_mode->hdisplay ||
  84                     mode->vdisplay != panel_mode->vdisplay)
  85                         return -EINVAL;
  86
  87                 /*
  88                  * The flat panel mode is fixed, just copy it to the adjusted
  89                  * mode.
  90                  */
  91                 drm_mode_copy(adjusted_mode, panel_mode);
  92         }
  93
  94         if (renc->lvds)
  95                 rcar_du_lvdsenc_atomic_check(renc->lvds, adjusted_mode);
  96
  97         return 0;
  98 }
  99
 100 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
 101                                      struct drm_crtc_state *crtc_state,
 102                                      struct drm_connector_state *conn_state)
 103 {
 104         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 105         struct drm_display_info *info = &conn_state->connector->display_info;
 106         enum rcar_lvds_mode mode;
 107
 108         rcar_du_crtc_route_output(crtc_state->crtc, renc->output);
 109
 110         if (!renc->lvds) {
 111                 /*
 112                  * The DU driver creates connectors only for the outputs of the
 113                  * internal LVDS encoders.
 114                  */
 115                 renc->connector = NULL;
 116                 return;
 117         }
 118
 119         renc->connector = to_rcar_connector(conn_state->connector);
 120
 121         if (!info->num_bus_formats || !info->bus_formats) {
 122                 dev_err(encoder->dev->dev, "no LVDS bus format reported\n");
 123                 return;
 124         }
 125
 126         switch (info->bus_formats[0]) {
 127         case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG:
 128         case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA:
 129                 mode = RCAR_LVDS_MODE_JEIDA;
 130                 break;
 131         case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG:
 132                 mode = RCAR_LVDS_MODE_VESA;
 133                 break;
 134         default:
 135                 dev_err(encoder->dev->dev,
 136                         "unsupported LVDS bus format 0x%04x\n",
 137                         info->bus_formats[0]);
 138                 return;
 139         }
 140
 141         if (info->bus_flags & DRM_BUS_FLAG_DATA_LSB_TO_MSB)
 142                 mode |= RCAR_LVDS_MODE_MIRROR;
 143
 144         rcar_du_lvdsenc_set_mode(renc->lvds, mode);
 145 }
 146
 147 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 148         .atomic_mode_set = rcar_du_encoder_mode_set,
 149         .disable = rcar_du_encoder_disable,
 150         .enable = rcar_du_encoder_enable,
 151         .atomic_check = rcar_du_encoder_atomic_check,
 152 };
 153
 154 static const struct drm_encoder_funcs encoder_funcs = {
 155         .destroy = drm_encoder_cleanup,
 156 };
 157
 158 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 159                          enum rcar_du_output output,
 160                          struct device_node *enc_node,
 161                          struct device_node *con_node)
 162 {
 163         struct rcar_du_encoder *renc;
 164         struct drm_encoder *encoder;
 165         struct drm_bridge *bridge = NULL;
 166         int ret;
 167
 168         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
 169         if (renc == NULL)
 170                 return -ENOMEM;
 171
 172         renc->output = output;
 173         encoder = rcar_encoder_to_drm_encoder(renc);
 174
 175         switch (output) {
 176         case RCAR_DU_OUTPUT_LVDS0:
 177                 renc->lvds = rcdu->lvds[0];
 178                 break;
 179
 180         case RCAR_DU_OUTPUT_LVDS1:
 181                 renc->lvds = rcdu->lvds[1];
 182                 break;
 183
 184         default:
 185                 break;
 186         }
 187
 188         if (enc_node) {
 189                 dev_dbg(rcdu->dev, "initializing encoder %pOF for output %u\n",
 190                         enc_node, output);
 191
 192                 /* Locate the DRM bridge from the encoder DT node. */
 193                 bridge = of_drm_find_bridge(enc_node);
 194                 if (!bridge) {
 195                         ret = -EPROBE_DEFER;
 196                         goto done;
 197                 }
 198         } else {
 199                 dev_dbg(rcdu->dev,
 200                         "initializing internal encoder for output %u\n",
 201                         output);
 202         }
 203
 204         ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 205                                DRM_MODE_ENCODER_NONE, NULL);
 206         if (ret < 0)
 207                 goto done;
 208
 209         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 210
 211         if (bridge) {
 212                 /*
 213                  * Attach the bridge to the encoder. The bridge will create the
 214                  * connector.
 215                  */
 216                 ret = drm_bridge_attach(encoder, bridge, NULL);
 217                 if (ret) {
 218                         drm_encoder_cleanup(encoder);
 219                         return ret;
 220                 }
 221         } else {
 222                 /* There's no bridge, create the connector manually. */
 223                 switch (output) {
 224                 case RCAR_DU_OUTPUT_LVDS0:
 225                 case RCAR_DU_OUTPUT_LVDS1:
 226                         ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
 227                         break;
 228
 229                 default:
 230                         ret = -EINVAL;
 231                         break;
 232                 }
 233         }
 234
 235 done:
 236         if (ret < 0) {
 237                 if (encoder->name)
 238                         encoder->funcs->destroy(encoder);
 239                 devm_kfree(rcdu->dev, renc);
 240         }
 241
 242         return ret;
 243 }