drivers/gpu/drm/rcar-du/rcar_du_lvdscon.c

   1 /*
   2  * rcar_du_lvdscon.c  --  R-Car Display Unit LVDS Connector
   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 <drm/drmP.h>
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_crtc_helper.h>
  17
  18 #include <video/display_timing.h>
  19 #include <video/of_display_timing.h>
  20 #include <video/videomode.h>
  21
  22 #include "rcar_du_drv.h"
  23 #include "rcar_du_encoder.h"
  24 #include "rcar_du_kms.h"
  25 #include "rcar_du_lvdscon.h"
  26
  27 struct rcar_du_lvds_connector {
  28         struct rcar_du_connector connector;
  29
  30         struct {
  31                 unsigned int width_mm;          /* Panel width in mm */
  32                 unsigned int height_mm;         /* Panel height in mm */
  33                 struct videomode mode;
  34         } panel;
  35 };
  36
  37 #define to_rcar_lvds_connector(c) \
  38         container_of(c, struct rcar_du_lvds_connector, connector.connector)
  39
  40 static int rcar_du_lvds_connector_get_modes(struct drm_connector *connector)
  41 {
  42         struct rcar_du_lvds_connector *lvdscon =
  43                 to_rcar_lvds_connector(connector);
  44         struct drm_display_mode *mode;
  45
  46         mode = drm_mode_create(connector->dev);
  47         if (mode == NULL)
  48                 return 0;
  49
  50         mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
  51
  52         drm_display_mode_from_videomode(&lvdscon->panel.mode, mode);
  53
  54         drm_mode_probed_add(connector, mode);
  55
  56         return 1;
  57 }
  58
  59 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  60         .get_modes = rcar_du_lvds_connector_get_modes,
  61         .best_encoder = rcar_du_connector_best_encoder,
  62 };
  63
  64 static void rcar_du_lvds_connector_destroy(struct drm_connector *connector)
  65 {
  66         drm_connector_unregister(connector);
  67         drm_connector_cleanup(connector);
  68 }
  69
  70 static enum drm_connector_status
  71 rcar_du_lvds_connector_detect(struct drm_connector *connector, bool force)
  72 {
  73         return connector_status_connected;
  74 }
  75
  76 static const struct drm_connector_funcs connector_funcs = {
  77         .dpms = drm_helper_connector_dpms,
  78         .detect = rcar_du_lvds_connector_detect,
  79         .fill_modes = drm_helper_probe_single_connector_modes,
  80         .destroy = rcar_du_lvds_connector_destroy,
  81 };
  82
  83 int rcar_du_lvds_connector_init(struct rcar_du_device *rcdu,
  84                                 struct rcar_du_encoder *renc,
  85                                 /* TODO const */ struct device_node *np)
  86 {
  87         struct rcar_du_lvds_connector *lvdscon;
  88         struct drm_connector *connector;
  89         struct display_timing timing;
  90         int ret;
  91
  92         lvdscon = devm_kzalloc(rcdu->dev, sizeof(*lvdscon), GFP_KERNEL);
  93         if (lvdscon == NULL)
  94                 return -ENOMEM;
  95
  96         ret = of_get_display_timing(np, "panel-timing", &timing);
  97         if (ret < 0)
  98                 return ret;
  99
 100         videomode_from_timing(&timing, &lvdscon->panel.mode);
 101
 102         of_property_read_u32(np, "width-mm", &lvdscon->panel.width_mm);
 103         of_property_read_u32(np, "height-mm", &lvdscon->panel.height_mm);
 104
 105         connector = &lvdscon->connector.connector;
 106         connector->display_info.width_mm = lvdscon->panel.width_mm;
 107         connector->display_info.height_mm = lvdscon->panel.height_mm;
 108
 109         ret = drm_connector_init(rcdu->ddev, connector, &connector_funcs,
 110                                  DRM_MODE_CONNECTOR_LVDS);
 111         if (ret < 0)
 112                 return ret;
 113
 114         drm_connector_helper_add(connector, &connector_helper_funcs);
 115         ret = drm_connector_register(connector);
 116         if (ret < 0)
 117                 return ret;
 118
 119         drm_helper_connector_dpms(connector, DRM_MODE_DPMS_OFF);
 120         drm_object_property_set_value(&connector->base,
 121                 rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);
 122
 123         ret = drm_mode_connector_attach_encoder(connector, &renc->encoder);
 124         if (ret < 0)
 125                 return ret;
 126
 127         connector->encoder = &renc->encoder;
 128         lvdscon->connector.encoder = renc;
 129
 130         return 0;
 131 }