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_kms.h"
  23 #include "rcar_du_lvdscon.h"
  24 #include "rcar_du_lvdsenc.h"
  25 #include "rcar_du_vgacon.h"
  26
  27 /* -----------------------------------------------------------------------------
  28  * Common connector functions
  29  */
  30
  31 struct drm_encoder *
  32 rcar_du_connector_best_encoder(struct drm_connector *connector)
  33 {
  34         struct rcar_du_connector *rcon = to_rcar_connector(connector);
  35
  36         return &rcon->encoder->encoder;
  37 }
  38
  39 /* -----------------------------------------------------------------------------
  40  * Encoder
  41  */
  42
  43 static void rcar_du_encoder_dpms(struct drm_encoder *encoder, int mode)
  44 {
  45         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  46
  47         if (renc->lvds)
  48                 rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc, mode);
  49 }
  50
  51 static bool rcar_du_encoder_mode_fixup(struct drm_encoder *encoder,
  52                                        const struct drm_display_mode *mode,
  53                                        struct drm_display_mode *adjusted_mode)
  54 {
  55         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
  56         const struct drm_display_mode *panel_mode;
  57         struct drm_device *dev = encoder->dev;
  58         struct drm_connector *connector;
  59         bool found = false;
  60
  61         /* DAC encoders have currently no restriction on the mode. */
  62         if (encoder->encoder_type == DRM_MODE_ENCODER_DAC)
  63                 return true;
  64
  65         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
  66                 if (connector->encoder == encoder) {
  67                         found = true;
  68                         break;
  69                 }
  70         }
  71
  72         if (!found) {
  73                 dev_dbg(dev->dev, "mode_fixup: no connector found\n");
  74                 return false;
  75         }
  76
  77         if (list_empty(&connector->modes)) {
  78                 dev_dbg(dev->dev, "mode_fixup: empty modes list\n");
  79                 return false;
  80         }
  81
  82         panel_mode = list_first_entry(&connector->modes,
  83                                       struct drm_display_mode, head);
  84
  85         /* We're not allowed to modify the resolution. */
  86         if (mode->hdisplay != panel_mode->hdisplay ||
  87             mode->vdisplay != panel_mode->vdisplay)
  88                 return false;
  89
  90         /* The flat panel mode is fixed, just copy it to the adjusted mode. */
  91         drm_mode_copy(adjusted_mode, panel_mode);
  92
  93         /* The internal LVDS encoder has a clock frequency operating range of
  94          * 30MHz to 150MHz. Clamp the clock accordingly.
  95          */
  96         if (renc->lvds)
  97                 adjusted_mode->clock = clamp(adjusted_mode->clock,
  98                                              30000, 150000);
  99
 100         return true;
 101 }
 102
 103 static void rcar_du_encoder_mode_prepare(struct drm_encoder *encoder)
 104 {
 105         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 106
 107         if (renc->lvds)
 108                 rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc,
 109                                      DRM_MODE_DPMS_OFF);
 110 }
 111
 112 static void rcar_du_encoder_mode_commit(struct drm_encoder *encoder)
 113 {
 114         struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
 115
 116         if (renc->lvds)
 117                 rcar_du_lvdsenc_dpms(renc->lvds, encoder->crtc,
 118                                      DRM_MODE_DPMS_ON);
 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         .prepare = rcar_du_encoder_mode_prepare,
 134         .commit = rcar_du_encoder_mode_commit,
 135         .mode_set = rcar_du_encoder_mode_set,
 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                          const struct rcar_du_encoder_data *data,
 146                          struct device_node *np)
 147 {
 148         struct rcar_du_encoder *renc;
 149         unsigned int encoder_type;
 150         int ret;
 151
 152         renc = devm_kzalloc(rcdu->dev, sizeof(*renc), GFP_KERNEL);
 153         if (renc == NULL)
 154                 return -ENOMEM;
 155
 156         renc->output = output;
 157
 158         switch (output) {
 159         case RCAR_DU_OUTPUT_LVDS0:
 160                 renc->lvds = rcdu->lvds[0];
 161                 break;
 162
 163         case RCAR_DU_OUTPUT_LVDS1:
 164                 renc->lvds = rcdu->lvds[1];
 165                 break;
 166
 167         default:
 168                 break;
 169         }
 170
 171         switch (type) {
 172         case RCAR_DU_ENCODER_VGA:
 173                 encoder_type = DRM_MODE_ENCODER_DAC;
 174                 break;
 175         case RCAR_DU_ENCODER_LVDS:
 176                 encoder_type = DRM_MODE_ENCODER_LVDS;
 177                 break;
 178         case RCAR_DU_ENCODER_NONE:
 179         default:
 180                 /* No external encoder, use the internal encoder type. */
 181                 encoder_type = rcdu->info->routes[output].encoder_type;
 182                 break;
 183         }
 184
 185         ret = drm_encoder_init(rcdu->ddev, &renc->encoder, &encoder_funcs,
 186                                encoder_type);
 187         if (ret < 0)
 188                 return ret;
 189
 190         drm_encoder_helper_add(&renc->encoder, &encoder_helper_funcs);
 191
 192         switch (encoder_type) {
 193         case DRM_MODE_ENCODER_LVDS: {
 194                 const struct rcar_du_panel_data *pdata =
 195                         data ? &data->connector.lvds.panel : NULL;
 196                 return rcar_du_lvds_connector_init(rcdu, renc, pdata, np);
 197         }
 198
 199         case DRM_MODE_ENCODER_DAC:
 200                 return rcar_du_vga_connector_init(rcdu, renc);
 201
 202         default:
 203                 return -EINVAL;
 204         }
 205 }