drivers/gpu/drm/mxsfb/mxsfb_out.c

   1 /*
   2  * Copyright (C) 2016 Marek Vasut <marex@denx.de>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/of_graph.h>
  15
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_crtc.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_of.h>
  22 #include <drm/drm_panel.h>
  23 #include <drm/drm_plane_helper.h>
  24 #include <drm/drm_probe_helper.h>
  25 #include <drm/drm_simple_kms_helper.h>
  26 #include <drm/drmP.h>
  27
  28 #include "mxsfb_drv.h"
  29
  30 static struct mxsfb_drm_private *
  31 drm_connector_to_mxsfb_drm_private(struct drm_connector *connector)
  32 {
  33         return container_of(connector, struct mxsfb_drm_private, connector);
  34 }
  35
  36 static int mxsfb_panel_get_modes(struct drm_connector *connector)
  37 {
  38         struct mxsfb_drm_private *mxsfb =
  39                         drm_connector_to_mxsfb_drm_private(connector);
  40
  41         if (mxsfb->panel)
  42                 return mxsfb->panel->funcs->get_modes(mxsfb->panel);
  43
  44         return 0;
  45 }
  46
  47 static const struct
  48 drm_connector_helper_funcs mxsfb_panel_connector_helper_funcs = {
  49         .get_modes = mxsfb_panel_get_modes,
  50 };
  51
  52 static enum drm_connector_status
  53 mxsfb_panel_connector_detect(struct drm_connector *connector, bool force)
  54 {
  55         struct mxsfb_drm_private *mxsfb =
  56                         drm_connector_to_mxsfb_drm_private(connector);
  57
  58         if (mxsfb->panel)
  59                 return connector_status_connected;
  60
  61         return connector_status_disconnected;
  62 }
  63
  64 static void mxsfb_panel_connector_destroy(struct drm_connector *connector)
  65 {
  66         struct mxsfb_drm_private *mxsfb =
  67                         drm_connector_to_mxsfb_drm_private(connector);
  68
  69         if (mxsfb->panel)
  70                 drm_panel_detach(mxsfb->panel);
  71
  72         drm_connector_unregister(connector);
  73         drm_connector_cleanup(connector);
  74 }
  75
  76 static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
  77         .detect                 = mxsfb_panel_connector_detect,
  78         .fill_modes             = drm_helper_probe_single_connector_modes,
  79         .destroy                = mxsfb_panel_connector_destroy,
  80         .reset                  = drm_atomic_helper_connector_reset,
  81         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  82         .atomic_destroy_state   = drm_atomic_helper_connector_destroy_state,
  83 };
  84
  85 int mxsfb_create_output(struct drm_device *drm)
  86 {
  87         struct mxsfb_drm_private *mxsfb = drm->dev_private;
  88         struct drm_panel *panel;
  89         int ret;
  90
  91         ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, NULL);
  92         if (ret)
  93                 return ret;
  94
  95         mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
  96         mxsfb->connector.polled = 0;
  97         drm_connector_helper_add(&mxsfb->connector,
  98                         &mxsfb_panel_connector_helper_funcs);
  99         ret = drm_connector_init(drm, &mxsfb->connector,
 100                                  &mxsfb_panel_connector_funcs,
 101                                  DRM_MODE_CONNECTOR_Unknown);
 102         if (!ret)
 103                 mxsfb->panel = panel;
 104
 105         return ret;
 106 }