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_crtc_helper.h>
  20 #include <drm/drm_fb_cma_helper.h>
  21 #include <drm/drm_gem_cma_helper.h>
  22 #include <drm/drm_panel.h>
  23 #include <drm/drm_plane_helper.h>
  24 #include <drm/drm_simple_kms_helper.h>
  25 #include <drm/drmP.h>
  26
  27 #include "mxsfb_drv.h"
  28
  29 static struct mxsfb_drm_private *
  30 drm_connector_to_mxsfb_drm_private(struct drm_connector *connector)
  31 {
  32         return container_of(connector, struct mxsfb_drm_private, connector);
  33 }
  34
  35 static int mxsfb_panel_get_modes(struct drm_connector *connector)
  36 {
  37         struct mxsfb_drm_private *mxsfb =
  38                         drm_connector_to_mxsfb_drm_private(connector);
  39
  40         if (mxsfb->panel)
  41                 return mxsfb->panel->funcs->get_modes(mxsfb->panel);
  42
  43         return 0;
  44 }
  45
  46 static const struct
  47 drm_connector_helper_funcs mxsfb_panel_connector_helper_funcs = {
  48         .get_modes = mxsfb_panel_get_modes,
  49 };
  50
  51 static enum drm_connector_status
  52 mxsfb_panel_connector_detect(struct drm_connector *connector, bool force)
  53 {
  54         struct mxsfb_drm_private *mxsfb =
  55                         drm_connector_to_mxsfb_drm_private(connector);
  56
  57         if (mxsfb->panel)
  58                 return connector_status_connected;
  59
  60         return connector_status_disconnected;
  61 }
  62
  63 static void mxsfb_panel_connector_destroy(struct drm_connector *connector)
  64 {
  65         struct mxsfb_drm_private *mxsfb =
  66                         drm_connector_to_mxsfb_drm_private(connector);
  67
  68         if (mxsfb->panel)
  69                 drm_panel_detach(mxsfb->panel);
  70
  71         drm_connector_unregister(connector);
  72         drm_connector_cleanup(connector);
  73 }
  74
  75 static const struct drm_connector_funcs mxsfb_panel_connector_funcs = {
  76         .dpms                   = drm_atomic_helper_connector_dpms,
  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 static int mxsfb_attach_endpoint(struct drm_device *drm,
  86                                  const struct of_endpoint *ep)
  87 {
  88         struct mxsfb_drm_private *mxsfb = drm->dev_private;
  89         struct device_node *np;
  90         struct drm_panel *panel;
  91         int ret = -EPROBE_DEFER;
  92
  93         np = of_graph_get_remote_port_parent(ep->local_node);
  94         panel = of_drm_find_panel(np);
  95         of_node_put(np);
  96
  97         if (!panel)
  98                 return -EPROBE_DEFER;
  99
 100         mxsfb->connector.dpms = DRM_MODE_DPMS_OFF;
 101         mxsfb->connector.polled = 0;
 102         drm_connector_helper_add(&mxsfb->connector,
 103                         &mxsfb_panel_connector_helper_funcs);
 104         ret = drm_connector_init(drm, &mxsfb->connector,
 105                                  &mxsfb_panel_connector_funcs,
 106                                  DRM_MODE_CONNECTOR_Unknown);
 107         if (!ret)
 108                 mxsfb->panel = panel;
 109
 110         return ret;
 111 }
 112
 113 int mxsfb_create_output(struct drm_device *drm)
 114 {
 115         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 116         struct device_node *ep_np = NULL;
 117         struct of_endpoint ep;
 118         int ret;
 119
 120         for_each_endpoint_of_node(drm->dev->of_node, ep_np) {
 121                 ret = of_graph_parse_endpoint(ep_np, &ep);
 122                 if (!ret)
 123                         ret = mxsfb_attach_endpoint(drm, &ep);
 124
 125                 if (ret) {
 126                         of_node_put(ep_np);
 127                         return ret;
 128                 }
 129         }
 130
 131         if (!mxsfb->panel)
 132                 return -EPROBE_DEFER;
 133
 134         return 0;
 135 }