kernel/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_atomic_helper.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_crtc_helper.h>
  18
  19 #include <video/display_timing.h>
  20 #include <video/of_display_timing.h>
  21 #include <video/videomode.h>
  22
  23 #include "rcar_du_drv.h"
  24 #include "rcar_du_encoder.h"
  25 #include "rcar_du_kms.h"
  26 #include "rcar_du_lvdscon.h"
  27
  28 struct rcar_du_lvds_connector {
  29         struct rcar_du_connector connector;
  30
  31         struct {
  32                 unsigned int width_mm;          /* Panel width in mm */
  33                 unsigned int height_mm;         /* Panel height in mm */
  34                 struct videomode mode;
  35         } panel;
  36 };
  37
  38 #define to_rcar_lvds_connector(c) \
  39         container_of(c, struct rcar_du_lvds_connector, connector.connector)
  40
  41 static int rcar_du_lvds_connector_get_modes(struct drm_connector *connector)
  42 {
  43         struct rcar_du_lvds_connector *lvdscon =
  44                 to_rcar_lvds_connector(connector);
  45         struct drm_display_mode *mode;
  46
  47         mode = drm_mode_create(connector->dev);
  48         if (mode == NULL)
  49                 return 0;
  50
  51         mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
  52
  53         drm_display_mode_from_videomode(&lvdscon->panel.mode, mode);
  54
  55         drm_mode_probed_add(connector, mode);
  56
  57         return 1;
  58 }
  59
  60 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  61         .get_modes = rcar_du_lvds_connector_get_modes,
  62         .best_encoder = rcar_du_connector_best_encoder,
  63 };
  64
  65 static void rcar_du_lvds_connector_destroy(struct drm_connector *connector)
  66 {
  67         drm_connector_unregister(connector);
  68         drm_connector_cleanup(connector);
  69 }
  70
  71 static enum drm_connector_status
  72 rcar_du_lvds_connector_detect(struct drm_connector *connector, bool force)
  73 {
  74         return connector_status_connected;
  75 }
  76
  77 static const struct drm_connector_funcs connector_funcs = {
  78         .dpms = drm_atomic_helper_connector_dpms,
  79         .reset = drm_atomic_helper_connector_reset,
  80         .detect = rcar_du_lvds_connector_detect,
  81         .fill_modes = drm_helper_probe_single_connector_modes,
  82         .destroy = rcar_du_lvds_connector_destroy,
  83         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  84         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  85 };
  86
  87 int rcar_du_lvds_connector_init(struct rcar_du_device *rcdu,
  88                                 struct rcar_du_encoder *renc,
  89                                 /* TODO const */ struct device_node *np)
  90 {
  91         struct drm_encoder *encoder = rcar_encoder_to_drm_encoder(renc);
  92         struct rcar_du_lvds_connector *lvdscon;
  93         struct drm_connector *connector;
  94         struct display_timing timing;
  95         int ret;
  96
  97         lvdscon = devm_kzalloc(rcdu->dev, sizeof(*lvdscon), GFP_KERNEL);
  98         if (lvdscon == NULL)
  99                 return -ENOMEM;
 100
 101         ret = of_get_display_timing(np, "panel-timing", &timing);
 102         if (ret < 0)
 103                 return ret;
 104
 105         videomode_from_timing(&timing, &lvdscon->panel.mode);
 106
 107         of_property_read_u32(np, "width-mm", &lvdscon->panel.width_mm);
 108         of_property_read_u32(np, "height-mm", &lvdscon->panel.height_mm);
 109
 110         connector = &lvdscon->connector.connector;
 111         connector->display_info.width_mm = lvdscon->panel.width_mm;
 112         connector->display_info.height_mm = lvdscon->panel.height_mm;
 113
 114         ret = drm_connector_init(rcdu->ddev, connector, &connector_funcs,
 115                                  DRM_MODE_CONNECTOR_LVDS);
 116         if (ret < 0)
 117                 return ret;
 118
 119         drm_connector_helper_add(connector, &connector_helper_funcs);
 120         ret = drm_connector_register(connector);
 121         if (ret < 0)
 122                 return ret;
 123
 124         connector->dpms = DRM_MODE_DPMS_OFF;
 125         drm_object_property_set_value(&connector->base,
 126                 rcdu->ddev->mode_config.dpms_property, DRM_MODE_DPMS_OFF);
 127
 128         ret = drm_mode_connector_attach_encoder(connector, encoder);
 129         if (ret < 0)
 130                 return ret;
 131
 132         lvdscon->connector.encoder = renc;
 133
 134         return 0;
 135 }