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  * Common connector functions
  31  */
  32
  33 struct drm_encoder *
  34 rcar_du_connector_best_encoder(struct drm_connector *connector)
  35 {
  36         struct rcar_du_connector *rcon = to_rcar_connector(connector);
  37
  38         return rcar_encoder_to_drm_encoder(rcon->encoder);
  39 }
  40
  41 /* -----------------------------------------------------------------------------
  42  * Encoder
  43  */
  44
  45 static void rcar_du_encoder_disable(struct drm_encoder *encoder)
  46 {
  47         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  48
  49         if (renc->lvds)
  50                 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, false);
  51 }
  52
  53 static void rcar_du_encoder_enable(struct drm_encoder *encoder)
  54 {
  55         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  56
  57         if (renc->lvds)
  58                 rcar_du_lvdsenc_enable(renc->lvds, encoder->crtc, true);
  59 }
  60
  61 static int rcar_du_encoder_atomic_check(struct drm_encoder *encoder,
  62                                         struct drm_crtc_state *crtc_state,
  63                                         struct drm_connector_state *conn_state)
  64 {
  65         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  66         struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
  67         const struct drm_display_mode *mode = &crtc_state->mode;
  68         const struct drm_display_mode *panel_mode;
  69         struct drm_connector *connector = conn_state->connector;
  70         struct drm_device *dev = encoder->dev;
  71
  72         /* DAC encoders have currently no restriction on the mode. */
  73         if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
  74                 return 0;
  75
  76         if (list_empty(&connector->modes)) {
  77                 dev_dbg(dev->dev, "encoder: empty modes list\n");
  78                 return -EINVAL;
  79         }
  80
  81         panel_mode = list_first_entry(&connector->modes,
  82                                       struct drm_display_mode, head);
  83
  84         /* We're not allowed to modify the resolution. */
  85         if (mode->hdisplay != panel_mode->hdisplay ||
  86             mode->vdisplay != panel_mode->vdisplay)
  87                 return -EINVAL;
  88
  89         /* The flat panel mode is fixed, just copy it to the adjusted mode. */
  90         drm_mode_copy(adjusted_mode, panel_mode);
  91
  92         /* The internal LVDS encoder has a clock frequency operating range of
  93          * 30MHz to 150MHz. Clamp the clock accordingly.
  94          */
  95         if (renc->lvds)
  96                 adjusted_mode->clock = clamp(adjusted_mode->clock,
  97                                              30000, 150000);
  98
  99         return 0;
 100 }
 101
 102 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
 103                                      struct drm_display_mode *mode,
 104                                      struct drm_display_mode *adjusted_mode)
 105 {
 106         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 107
 108         rcar_du_crtc_route_output(encoder->crtc, renc->output);
 109 }
 110
 111 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 112         .mode_set = rcar_du_encoder_mode_set,
 113         .disable = rcar_du_encoder_disable,
 114         .enable = rcar_du_encoder_enable,
 115         .atomic_check = rcar_du_encoder_atomic_check,
 116 };
 117
 118 static const struct drm_encoder_funcs encoder_funcs = {
 119         .destroy = drm_encoder_cleanup,
 120 };
 121
 122 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 123                          enum rcar_du_encoder_type type,
 124                          enum rcar_du_output output,
 125                          struct device_node *enc_node,
 126                          struct device_node *con_node)
 127 {
 128         struct rcar_du_encoder *renc;
 129         struct drm_encoder *encoder;
 130         unsigned int encoder_type;
 131         int ret;
 132
 133         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
 134         if (renc == NULL)
 135                 return -ENOMEM;
 136
 137         renc->output = output;
 138         encoder = rcar_encoder_to_drm_encoder(renc);
 139
 140         switch (output) {
 141         case RCAR_DU_OUTPUT_LVDS0:
 142                 renc->lvds = rcdu->lvds[0];
 143                 break;
 144
 145         case RCAR_DU_OUTPUT_LVDS1:
 146                 renc->lvds = rcdu->lvds[1];
 147                 break;
 148
 149         default:
 150                 break;
 151         }
 152
 153         switch (type) {
 154         case RCAR_DU_ENCODER_VGA:
 155                 encoder_type = DRM_MODE_ENCODER_DAC;
 156                 break;
 157         case RCAR_DU_ENCODER_LVDS:
 158                 encoder_type = DRM_MODE_ENCODER_LVDS;
 159                 break;
 160         case RCAR_DU_ENCODER_HDMI:
 161                 encoder_type = DRM_MODE_ENCODER_TMDS;
 162                 break;
 163         case RCAR_DU_ENCODER_NONE:
 164         default:
 165                 /* No external encoder, use the internal encoder type. */
 166                 encoder_type = rcdu->info->routes[output].encoder_type;
 167                 break;
 168         }
 169
 170         if (type == RCAR_DU_ENCODER_HDMI) {
 171                 ret = rcar_du_hdmienc_init(rcdu, renc, enc_node);
 172                 if (ret < 0)
 173                         goto done;
 174         } else {
 175                 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 176                                        encoder_type, NULL);
 177                 if (ret < 0)
 178                         goto done;
 179
 180                 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 181         }
 182
 183         switch (encoder_type) {
 184         case DRM_MODE_ENCODER_LVDS:
 185                 ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
 186                 break;
 187
 188         case DRM_MODE_ENCODER_DAC:
 189                 ret = rcar_du_vga_connector_init(rcdu, renc);
 190                 break;
 191
 192         case DRM_MODE_ENCODER_TMDS:
 193                 ret = rcar_du_hdmi_connector_init(rcdu, renc);
 194                 break;
 195
 196         default:
 197                 ret = -EINVAL;
 198                 break;
 199         }
 200
 201 done:
 202         if (ret < 0) {
 203                 if (encoder->name)
 204                         encoder->funcs->destroy(encoder);
 205                 devm_kfree(rcdu->dev, renc);
 206         }
 207
 208         return ret;
 209 }