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 const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  62         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  63         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  64         .destroy = fsl_dcu_drm_connector_destroy,
  65         .dpms = drm_atomic_helper_connector_dpms,
  66         .fill_modes = drm_helper_probe_single_connector_modes,
  67         .reset = drm_atomic_helper_connector_reset,
  68 };
  69
  70 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
  71 {
  72         struct fsl_dcu_drm_connector *fsl_connector;
  73         int (*get_modes)(struct drm_panel *panel);
  74         int num_modes = 0;
  75
  76         fsl_connector = to_fsl_dcu_connector(connector);
  77         if (fsl_connector->panel && fsl_connector->panel->funcs &&
  78             fsl_connector->panel->funcs->get_modes) {
  79                 get_modes = fsl_connector->panel->funcs->get_modes;
  80                 num_modes = get_modes(fsl_connector->panel);
  81         }
  82
  83         return num_modes;
  84 }
  85
  86 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
  87                                             struct drm_display_mode *mode)
  88 {
  89         if (mode->hdisplay & 0xf)
  90                 return MODE_ERROR;
  91
  92         return MODE_OK;
  93 }
  94
  95 static const struct drm_connector_helper_funcs connector_helper_funcs = {
  96         .get_modes = fsl_dcu_drm_connector_get_modes,
  97         .mode_valid = fsl_dcu_drm_connector_mode_valid,
  98 };
  99
 100 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 101                                  struct drm_panel *panel)
 102 {
 103         struct drm_encoder *encoder = &fsl_dev->encoder;
 104         struct drm_connector *connector = &fsl_dev->connector.base;
 105         struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
 106         int ret;
 107
 108         fsl_dev->connector.encoder = encoder;
 109
 110         ret = drm_connector_init(fsl_dev->drm, connector,
 111                                  &fsl_dcu_drm_connector_funcs,
 112                                  DRM_MODE_CONNECTOR_LVDS);
 113         if (ret < 0)
 114                 return ret;
 115
 116         drm_connector_helper_add(connector, &connector_helper_funcs);
 117         ret = drm_connector_register(connector);
 118         if (ret < 0)
 119                 goto err_cleanup;
 120
 121         ret = drm_mode_connector_attach_encoder(connector, encoder);
 122         if (ret < 0)
 123                 goto err_sysfs;
 124
 125         drm_object_property_set_value(&connector->base,
 126                                       mode_config->dpms_property,
 127                                       DRM_MODE_DPMS_OFF);
 128
 129         ret = drm_panel_attach(panel, connector);
 130         if (ret) {
 131                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 132                 goto err_sysfs;
 133         }
 134
 135         return 0;
 136
 137 err_sysfs:
 138         drm_connector_unregister(connector);
 139 err_cleanup:
 140         drm_connector_cleanup(connector);
 141         return ret;
 142 }
 143
 144 static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
 145                                    const struct of_endpoint *ep)
 146 {
 147         struct drm_bridge *bridge;
 148         struct device_node *np;
 149
 150         np = of_graph_get_remote_port_parent(ep->local_node);
 151
 152         fsl_dev->connector.panel = of_drm_find_panel(np);
 153         if (fsl_dev->connector.panel) {
 154                 of_node_put(np);
 155                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 156         }
 157
 158         bridge = of_drm_find_bridge(np);
 159         of_node_put(np);
 160         if (!bridge)
 161                 return -ENODEV;
 162
 163         fsl_dev->encoder.bridge = bridge;
 164         bridge->encoder = &fsl_dev->encoder;
 165
 166         return drm_bridge_attach(fsl_dev->drm, bridge);
 167 }
 168
 169 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 170 {
 171         struct of_endpoint ep;
 172         struct device_node *ep_node, *panel_node;
 173         int ret;
 174
 175         /* This is for backward compatibility */
 176         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 177         if (panel_node) {
 178                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 179                 of_node_put(panel_node);
 180                 if (!fsl_dev->connector.panel)
 181                         return -EPROBE_DEFER;
 182                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 183         }
 184
 185         ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
 186         if (!ep_node)
 187                 return -ENODEV;
 188
 189         ret = of_graph_parse_endpoint(ep_node, &ep);
 190         of_node_put(ep_node);
 191         if (ret)
 192                 return -ENODEV;
 193
 194         return fsl_dcu_attach_endpoint(fsl_dev, &ep);
 195 }