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 void rcar_du_encoder_dpms(struct drm_encoder *encoder, int mode)
  62 {
  63         if (mode == DRM_MODE_DPMS_ON)
  64                 rcar_du_encoder_enable(encoder);
  65         else
  66                 rcar_du_encoder_disable(encoder);
  67 }
  68
  69 static bool rcar_du_encoder_mode_fixup(struct drm_encoder *encoder,
  70                                        const struct drm_display_mode *mode,
  71                                        struct drm_display_mode *adjusted_mode)
  72 {
  73         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  74         const struct drm_display_mode *panel_mode;
  75         struct drm_device *dev = encoder->dev;
  76         struct drm_connector *connector;
  77         bool found = false;
  78
  79         /* DAC encoders have currently no restriction on the mode. */
  80         if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
  81                 return true;
  82
  83         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  84                 if (connector->encoder == encoder) {
  85                         found = true;
  86                         break;
  87                 }
  88         }
  89
  90         if (!found) {
  91                 dev_dbg(dev->dev, "mode_fixup: no connector found\n");
  92                 return false;
  93         }
  94
  95         if (list_empty(&connector->modes)) {
  96                 dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
  97                 return false;
  98         }
  99
 100         panel_mode = list_first_entry(&connector->modes,
 101                                       struct drm_display_mode, head);
 102
 103         /* We're not allowed to modify the resolution. */
 104         if (mode->hdisplay != panel_mode->hdisplay ||
 105             mode->vdisplay != panel_mode->vdisplay)
 106                 return false;
 107
 108         /* The flat panel mode is fixed, just copy it to the adjusted mode. */
 109         drm_mode_copy(adjusted_mode, panel_mode);
 110
 111         /* The internal LVDS encoder has a clock frequency operating range of
 112          * 30MHz to 150MHz. Clamp the clock accordingly.
 113          */
 114         if (renc->lvds)
 115                 adjusted_mode->clock = clamp(adjusted_mode->clock,
 116                                              30000, 150000);
 117
 118         return true;
 119 }
 120
 121 static void rcar_du_encoder_mode_set(struct drm_encoder *encoder,
 122                                      struct drm_display_mode *mode,
 123                                      struct drm_display_mode *adjusted_mode)
 124 {
 125         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 126
 127         rcar_du_crtc_route_output(encoder->crtc, renc->output);
 128 }
 129
 130 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 131         .dpms = rcar_du_encoder_dpms,
 132         .mode_fixup = rcar_du_encoder_mode_fixup,
 133         .mode_set = rcar_du_encoder_mode_set,
 134         .disable = rcar_du_encoder_disable,
 135         .enable = rcar_du_encoder_enable,
 136 };
 137
 138 static const struct drm_encoder_funcs encoder_funcs = {
 139         .destroy = drm_encoder_cleanup,
 140 };
 141
 142 int rcar_du_encoder_init(struct rcar_du_device *rcdu,
 143                          enum rcar_du_encoder_type type,
 144                          enum rcar_du_output output,
 145                          struct device_node *enc_node,
 146                          struct device_node *con_node)
 147 {
 148         struct rcar_du_encoder *renc;
 149         struct drm_encoder *encoder;
 150         unsigned int encoder_type;
 151         int ret;
 152
 153         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
 154         if (renc == NULL)
 155                 return -ENOMEM;
 156
 157         renc->output = output;
 158         encoder = rcar_encoder_to_drm_encoder(renc);
 159
 160         switch (output) {
 161         case RCAR_DU_OUTPUT_LVDS0:
 162                 renc->lvds = rcdu->lvds[0];
 163                 break;
 164
 165         case RCAR_DU_OUTPUT_LVDS1:
 166                 renc->lvds = rcdu->lvds[1];
 167                 break;
 168
 169         default:
 170                 break;
 171         }
 172
 173         switch (type) {
 174         case RCAR_DU_ENCODER_VGA:
 175                 encoder_type = DRM_MODE_ENCODER_DAC;
 176                 break;
 177         case RCAR_DU_ENCODER_LVDS:
 178                 encoder_type = DRM_MODE_ENCODER_LVDS;
 179                 break;
 180         case RCAR_DU_ENCODER_HDMI:
 181                 encoder_type = DRM_MODE_ENCODER_TMDS;
 182                 break;
 183         case RCAR_DU_ENCODER_NONE:
 184         default:
 185                 /* No external encoder, use the internal encoder type. */
 186                 encoder_type = rcdu->info->routes[output].encoder_type;
 187                 break;
 188         }
 189
 190         if (type == RCAR_DU_ENCODER_HDMI) {
 191                 ret = rcar_du_hdmienc_init(rcdu, renc, enc_node);
 192                 if (ret < 0)
 193                         goto done;
 194         } else {
 195                 ret = drm_encoder_init(rcdu->ddev, encoder, &encoder_funcs,
 196                                        encoder_type);
 197                 if (ret < 0)
 198                         goto done;
 199
 200                 drm_encoder_helper_add(encoder, &encoder_helper_funcs);
 201         }
 202
 203         switch (encoder_type) {
 204         case DRM_MODE_ENCODER_LVDS:
 205                 ret = rcar_du_lvds_connector_init(rcdu, renc, con_node);
 206                 break;
 207
 208         case DRM_MODE_ENCODER_DAC:
 209                 ret = rcar_du_vga_connector_init(rcdu, renc);
 210                 break;
 211
 212         case DRM_MODE_ENCODER_TMDS:
 213                 ret = rcar_du_hdmi_connector_init(rcdu, renc);
 214                 break;
 215
 216         default:
 217                 ret = -EINVAL;
 218                 break;
 219         }
 220
 221 done:
 222         if (ret < 0) {
 223                 if (encoder->name)
 224                         encoder->funcs->destroy(encoder);
 225                 devm_kfree(rcdu->dev, renc);
 226         }
 227
 228         return ret;
 229 }