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 int
  24 fsl_dcu_drm_encoder_atomic_check(struct drm_encoder *encoder,
  25                                  struct drm_crtc_state *crtc_state,
  26                                  struct drm_connector_state *conn_state)
  27 {
  28         return 0;
  29 }
  30
  31 static void fsl_dcu_drm_encoder_disable(struct drm_encoder *encoder)
  32 {
  33         struct drm_device *dev = encoder->dev;
  34         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  35
  36         if (fsl_dev->tcon)
  37                 fsl_tcon_bypass_disable(fsl_dev->tcon);
  38 }
  39
  40 static void fsl_dcu_drm_encoder_enable(struct drm_encoder *encoder)
  41 {
  42         struct drm_device *dev = encoder->dev;
  43         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  44
  45         if (fsl_dev->tcon)
  46                 fsl_tcon_bypass_enable(fsl_dev->tcon);
  47 }
  48
  49 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  50         .atomic_check = fsl_dcu_drm_encoder_atomic_check,
  51         .disable = fsl_dcu_drm_encoder_disable,
  52         .enable = fsl_dcu_drm_encoder_enable,
  53 };
  54
  55 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  56 {
  57         drm_encoder_cleanup(encoder);
  58 }
  59
  60 static const struct drm_encoder_funcs encoder_funcs = {
  61         .destroy = fsl_dcu_drm_encoder_destroy,
  62 };
  63
  64 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  65                                struct drm_crtc *crtc)
  66 {
  67         struct drm_encoder *encoder = &fsl_dev->encoder;
  68         int ret;
  69
  70         encoder->possible_crtcs = 1;
  71         ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  72                                DRM_MODE_ENCODER_LVDS, NULL);
  73         if (ret < 0)
  74                 return ret;
  75
  76         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
  77
  78         return 0;
  79 }
  80
  81 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  82 {
  83         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  84
  85         drm_connector_unregister(connector);
  86         drm_panel_detach(fsl_con->panel);
  87         drm_connector_cleanup(connector);
  88 }
  89
  90 static enum drm_connector_status
  91 fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force)
  92 {
  93         return connector_status_connected;
  94 }
  95
  96 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  97         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  98         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  99         .destroy = fsl_dcu_drm_connector_destroy,
 100         .detect = fsl_dcu_drm_connector_detect,
 101         .dpms = drm_atomic_helper_connector_dpms,
 102         .fill_modes = drm_helper_probe_single_connector_modes,
 103         .reset = drm_atomic_helper_connector_reset,
 104 };
 105
 106 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 107 {
 108         struct fsl_dcu_drm_connector *fsl_connector;
 109         int (*get_modes)(struct drm_panel *panel);
 110         int num_modes = 0;
 111
 112         fsl_connector = to_fsl_dcu_connector(connector);
 113         if (fsl_connector->panel && fsl_connector->panel->funcs &&
 114             fsl_connector->panel->funcs->get_modes) {
 115                 get_modes = fsl_connector->panel->funcs->get_modes;
 116                 num_modes = get_modes(fsl_connector->panel);
 117         }
 118
 119         return num_modes;
 120 }
 121
 122 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 123                                             struct drm_display_mode *mode)
 124 {
 125         if (mode->hdisplay & 0xf)
 126                 return MODE_ERROR;
 127
 128         return MODE_OK;
 129 }
 130
 131 static const struct drm_connector_helper_funcs connector_helper_funcs = {
 132         .get_modes = fsl_dcu_drm_connector_get_modes,
 133         .mode_valid = fsl_dcu_drm_connector_mode_valid,
 134 };
 135
 136 static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
 137                                  struct drm_panel *panel)
 138 {
 139         struct drm_encoder *encoder = &fsl_dev->encoder;
 140         struct drm_connector *connector = &fsl_dev->connector.base;
 141         struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
 142         int ret;
 143
 144         fsl_dev->connector.encoder = encoder;
 145
 146         ret = drm_connector_init(fsl_dev->drm, connector,
 147                                  &fsl_dcu_drm_connector_funcs,
 148                                  DRM_MODE_CONNECTOR_LVDS);
 149         if (ret < 0)
 150                 return ret;
 151
 152         drm_connector_helper_add(connector, &connector_helper_funcs);
 153         ret = drm_connector_register(connector);
 154         if (ret < 0)
 155                 goto err_cleanup;
 156
 157         ret = drm_mode_connector_attach_encoder(connector, encoder);
 158         if (ret < 0)
 159                 goto err_sysfs;
 160
 161         drm_object_property_set_value(&connector->base,
 162                                       mode_config->dpms_property,
 163                                       DRM_MODE_DPMS_OFF);
 164
 165         ret = drm_panel_attach(panel, connector);
 166         if (ret) {
 167                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 168                 goto err_sysfs;
 169         }
 170
 171         return 0;
 172
 173 err_sysfs:
 174         drm_connector_unregister(connector);
 175 err_cleanup:
 176         drm_connector_cleanup(connector);
 177         return ret;
 178 }
 179
 180 static int fsl_dcu_attach_endpoint(struct fsl_dcu_drm_device *fsl_dev,
 181                                    const struct of_endpoint *ep)
 182 {
 183         struct drm_bridge *bridge;
 184         struct device_node *np;
 185
 186         np = of_graph_get_remote_port_parent(ep->local_node);
 187
 188         fsl_dev->connector.panel = of_drm_find_panel(np);
 189         if (fsl_dev->connector.panel) {
 190                 of_node_put(np);
 191                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 192         }
 193
 194         bridge = of_drm_find_bridge(np);
 195         of_node_put(np);
 196         if (!bridge)
 197                 return -ENODEV;
 198
 199         fsl_dev->encoder.bridge = bridge;
 200         bridge->encoder = &fsl_dev->encoder;
 201
 202         return drm_bridge_attach(fsl_dev->drm, bridge);
 203 }
 204
 205 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 206 {
 207         struct of_endpoint ep;
 208         struct device_node *ep_node, *panel_node;
 209         int ret;
 210
 211         /* This is for backward compatibility */
 212         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 213         if (panel_node) {
 214                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 215                 of_node_put(panel_node);
 216                 if (!fsl_dev->connector.panel)
 217                         return -EPROBE_DEFER;
 218                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 219         }
 220
 221         ep_node = of_graph_get_next_endpoint(fsl_dev->np, NULL);
 222         if (!ep_node)
 223                 return -ENODEV;
 224
 225         ret = of_graph_parse_endpoint(ep_node, &ep);
 226         of_node_put(ep_node);
 227         if (ret)
 228                 return -ENODEV;
 229
 230         return fsl_dcu_attach_endpoint(fsl_dev, &ep);
 231 }