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