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
  20 #include "rcar_du_drv.h"
  21 #include "rcar_du_encoder.h"
  22 #include "rcar_du_hdmicon.h"
  23 #include "rcar_du_hdmienc.h"
  24 #include "rcar_du_kms.h"
  25 #include "rcar_du_lvdscon.h"
  26 #include "rcar_du_lvdsenc.h"
  27 #include "rcar_du_vgacon.h"
  28
  29 /* -----------------------------------------------------------------------------
  30  * Encoder
  31  */
  32
  33 static void rcar_du_encoder_disable(struct drm_encoder *encoder)
  34 {
  35         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  36
  37         if (renc->lvds)
  38                 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
  39 }
  40
  41 static void rcar_du_encoder_enable(struct drm_encoder *encoder)
  42 {
  43         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  44
  45         if (renc->lvds)
  46                 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
  47 }
  48
  49 static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
  50                                         struct drm_crtc_state *crtc_state,
  51                                         struct drm_connector_state *conn_state)
  52 {
  53         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  54         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
  55         const struct drm_display_mode *mode = &crtc_state->mode;
  56         const struct drm_display_mode *panel_mode;
  57         struct drm_connector *connector = conn_state->connector;
  58         struct drm_device *dev = encoder->dev;
  59
  60         /* DAC encoders have currently no restriction on the mode. */
  61         if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
  62                 return 0;
  63
  64         if (list_empty(&connector->modes)) {
  65                 dev_dbg(dev->dev, "encoder: empty modes list\n");
  66                 return -EINVAL;
  67         }
  68
  69         panel_mode = list_first_entry(&connector->modes,
  70                                       struct drm_display_mode, head);
  71
  72         /* We're not allowed to modify the resolution. */
  73         if (mode->hdisplay != panel_mode->hdisplay ||
  74             mode->vdisplay != panel_mode->vdisplay)
  75                 return -EINVAL;
  76
  77         /* The flat panel mode is fixed, just copy it to the adjusted mode. */
  78         drm_mode_copy(adjusted_mode, panel_mode);
  79
  80         if (renc->lvds)
  81                 rcar_du_lvdsenc_atomic_check(renc->lvds, adjusted_mode);
  82
  83         return 0;
  84 }
  85
  86 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
  87                                      struct drm_display_mode *mode,
  88                                      struct drm_display_mode *adjusted_mode)
  89 {
  90         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  91
  92         rcar_du_crtc_route_output(encoder->crtc, renc->output);
  93 }
  94
  95 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  96         .mode_set = rcar_du_encoder_mode_set,
  97         .disable = rcar_du_encoder_disable,
  98         .enable = rcar_du_encoder_enable,
  99         .atomic_check = rcar_du_encoder_atomic_check,
 100 };
 101
 102 static const struct drm_encoder_funcs encoder_funcs = {
 103         .destroy = drm_encoder_cleanup,
 104 };
 105
 106 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 107                          enum rcar_du_encoder_type type,
 108                          enum rcar_du_output output,
 109                          struct device_node *enc_node,
 110                          struct device_node *con_node)
 111 {
 112         struct rcar_du_encoder *renc;
 113         struct drm_encoder *encoder;
 114         unsigned int encoder_type;
 115         int ret;
 116
 117         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
 118         if (renc == NULL)
 119                 return -ENOMEM;
 120
 121         renc->output = output;
 122         encoder = rcar_encoder_to_drm_encoder(renc);
 123
 124         switch (output) {
 125         case RCAR_DU_OUTPUT_LVDS0:
 126                 renc->lvds = rcdu->lvds[0];
 127                 break;
 128
 129         case RCAR_DU_OUTPUT_LVDS1:
 130                 renc->lvds = rcdu->lvds[1];
 131                 break;
 132
 133         default:
 134                 break;
 135         }
 136
 137         switch (type) {
 138         case RCAR_DU_ENCODER_VGA:
 139                 encoder_type = DRM_MODE_ENCODER_DAC;
 140                 break;
 141         case RCAR_DU_ENCODER_LVDS:
 142                 encoder_type = DRM_MODE_ENCODER_LVDS;
 143                 break;
 144         case RCAR_DU_ENCODER_HDMI:
 145                 encoder_type = DRM_MODE_ENCODER_TMDS;
 146                 break;
 147         case RCAR_DU_ENCODER_NONE:
 148         default:
 149                 /* No external encoder, use the internal encoder type. */
 150                 encoder_type = rcdu->info->routes[output].encoder_type;
 151                 break;
 152         }
 153
 154         if (type == RCAR_DU_ENCODER_HDMI) {
 155                 ret = rcar_du_hdmienc_init(rcdu, renc, enc_node);
 156                 if (ret < 0)
 157                         goto done;
 158         } else {
 159                 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 160                                        encoder_type, NULL);
 161                 if (ret < 0)
 162                         goto done;
 163
 164                 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 165         }
 166
 167         switch (encoder_type) {
 168         case DRM_MODE_ENCODER_LVDS:
 169                 ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
 170                 break;
 171
 172         case DRM_MODE_ENCODER_DAC:
 173                 ret = rcar_du_vga_connector_init(rcdu, renc);
 174                 break;
 175
 176         case DRM_MODE_ENCODER_TMDS:
 177                 ret = rcar_du_hdmi_connector_init(rcdu, renc);
 178                 break;
 179
 180         default:
 181                 ret = -EINVAL;
 182                 break;
 183         }
 184
 185 done:
 186         if (ret < 0) {
 187                 if (encoder->name)
 188                         encoder->funcs->destroy(encoder);
 189                 devm_kfree(rcdu->dev, renc);
 190         }
 191
 192         return ret;
 193 }