drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_rgb.c

   1 /*
   2  * Copyright 2015 Freescale Semiconductor, Inc.
   3  *
   4  * Freescale DCU drm device driver
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/backlight.h>
  13 #include <linux/of_graph.h>
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_panel.h>
  19
  20 #include "fsl_dcu_drm_drv.h"
  21 #include "fsl_tcon.h"
  22
  23 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  24 {
  25         drm_encoder_cleanup(encoder);
  26 }
  27
  28 static const struct drm_encoder_funcs encoder_funcs = {
  29         .destroy = fsl_dcu_drm_encoder_destroy,
  30 };
  31
  32 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  33                                struct drm_crtc *crtc)
  34 {
  35         struct drm_encoder *encoder = &fsl_dev->encoder;
  36         int ret;
  37
  38         encoder->possible_crtcs = 1;
  39
  40         /* Use bypass mode for parallel RGB/LVDS encoder */
  41         if (fsl_dev->tcon)
  42                 fsl_tcon_bypass_enable(fsl_dev->tcon);
  43
  44         ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  45                                DRM_MODE_ENCODER_LVDS, NULL);
  46         if (ret < 0)
  47                 return ret;
  48
  49         return 0;
  50 }
  51
  52 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  53 {
  54         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  55
  56         drm_connector_unregister(connector);
  57         drm_panel_detach(fsl_con->panel);
  58         drm_connector_cleanup(connector);
  59 }
  60
  61 static enum drm_connector_status
  62 fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force)
  63 {
  64         return connector_status_connected;
  65 }
  66
  67 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  68         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  69         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  70         .destroy = fsl_dcu_drm_connector_destroy,
  71         .detect = fsl_dcu_drm_connector_detect,
  72         .dpms = drm_atomic_helper_connector_dpms,
  73         .fill_modes = drm_helper_probe_single_connector_modes,
  74         .reset = drm_atomic_helper_connector_reset,
  75 };
  76
  77 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
  78 {
  79         struct fsl_dcu_drm_connector *fsl_connector;
  80         int (*get_modes)(struct drm_panel *panel);
  81         int num_modes = 0;
  82
  83         fsl_connector = to_fsl_dcu_connector(connector);
  84         if (fsl_connector->panel && fsl_connector->panel->funcs &&
  85             fsl_connector->panel->funcs->get_modes) {
  86                 get_modes = fsl_connector->panel->funcs->get_modes;
  87                 num_modes = get_modes(fsl_connector->panel);
  88         }
  89
  90         return num_modes;
  91 }
  92
  93 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
  94                                             struct drm_display_mode *mode)
  95 {
  96         if (mode->hdisplay & 0xf)
  97                 return MODE_ERROR;
  98
  99         return MODE_OK;
 100 }
 101
 102 static const struct drm_connector_helper_funcs connector_helper_funcs = {
 103         .get_modes = fsl_dcu_drm_connector_get_modes,
 104         .mode_valid = fsl_dcu_drm_connector_mode_valid,
 105 };
 106
 107 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 108                                  struct drm_panel *panel)
 109 {
 110         struct drm_encoder *encoder = &fsl_dev->encoder;
 111         struct drm_connector *connector = &fsl_dev->connector.base;
 112         struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
 113         int ret;
 114
 115         fsl_dev->connector.encoder = encoder;
 116
 117         ret = drm_connector_init(fsl_dev->drm, connector,
 118                                  &fsl_dcu_drm_connector_funcs,
 119                                  DRM_MODE_CONNECTOR_LVDS);
 120         if (ret < 0)
 121                 return ret;
 122
 123         drm_connector_helper_add(connector, &connector_helper_funcs);
 124         ret = drm_connector_register(connector);
 125         if (ret < 0)
 126                 goto err_cleanup;
 127
 128         ret = drm_mode_connector_attach_encoder(connector, encoder);
 129         if (ret < 0)
 130                 goto err_sysfs;
 131
 132         drm_object_property_set_value(&connector->base,
 133                                       mode_config->dpms_property,
 134                                       DRM_MODE_DPMS_OFF);
 135
 136         ret = drm_panel_attach(panel, connector);
 137         if (ret) {
 138                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 139                 goto err_sysfs;
 140         }
 141
 142         return 0;
 143
 144 err_sysfs:
 145         drm_connector_unregister(connector);
 146 err_cleanup:
 147         drm_connector_cleanup(connector);
 148         return ret;
 149 }
 150
 151 static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
 152                                    const struct of_endpoint *ep)
 153 {
 154         struct drm_bridge *bridge;
 155         struct device_node *np;
 156
 157         np = of_graph_get_remote_port_parent(ep->local_node);
 158
 159         fsl_dev->connector.panel = of_drm_find_panel(np);
 160         if (fsl_dev->connector.panel) {
 161                 of_node_put(np);
 162                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 163         }
 164
 165         bridge = of_drm_find_bridge(np);
 166         of_node_put(np);
 167         if (!bridge)
 168                 return -ENODEV;
 169
 170         fsl_dev->encoder.bridge = bridge;
 171         bridge->encoder = &fsl_dev->encoder;
 172
 173         return drm_bridge_attach(fsl_dev->drm, bridge);
 174 }
 175
 176 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 177 {
 178         struct of_endpoint ep;
 179         struct device_node *ep_node, *panel_node;
 180         int ret;
 181
 182         /* This is for backward compatibility */
 183         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 184         if (panel_node) {
 185                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 186                 of_node_put(panel_node);
 187                 if (!fsl_dev->connector.panel)
 188                         return -EPROBE_DEFER;
 189                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 190         }
 191
 192         ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
 193         if (!ep_node)
 194                 return -ENODEV;
 195
 196         ret = of_graph_parse_endpoint(ep_node, &ep);
 197         of_node_put(ep_node);
 198         if (ret)
 199                 return -ENODEV;
 200
 201         return fsl_dcu_attach_endpoint(fsl_dev, &ep);
 202 }