kernel/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
  14 #include <drm/drmP.h>
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_panel.h>
  18
  19 #include "fsl_dcu_drm_drv.h"
  20
  21 static int
  22 fsl_dcu_drm_encoder_atomic_check(struct drm_encoder *encoder,
  23                                  struct drm_crtc_state *crtc_state,
  24                                  struct drm_connector_state *conn_state)
  25 {
  26         return 0;
  27 }
  28
  29 static void fsl_dcu_drm_encoder_disable(struct drm_encoder *encoder)
  30 {
  31 }
  32
  33 static void fsl_dcu_drm_encoder_enable(struct drm_encoder *encoder)
  34 {
  35 }
  36
  37 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  38         .atomic_check = fsl_dcu_drm_encoder_atomic_check,
  39         .disable = fsl_dcu_drm_encoder_disable,
  40         .enable = fsl_dcu_drm_encoder_enable,
  41 };
  42
  43 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  44 {
  45         drm_encoder_cleanup(encoder);
  46 }
  47
  48 static const struct drm_encoder_funcs encoder_funcs = {
  49         .destroy = fsl_dcu_drm_encoder_destroy,
  50 };
  51
  52 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  53                                struct drm_crtc *crtc)
  54 {
  55         struct drm_encoder *encoder = &fsl_dev->encoder;
  56         int ret;
  57
  58         encoder->possible_crtcs = 1;
  59         ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  60                                DRM_MODE_ENCODER_LVDS);
  61         if (ret < 0)
  62                 return ret;
  63
  64         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
  65
  66         return 0;
  67 }
  68
  69 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  70 {
  71         drm_connector_unregister(connector);
  72         drm_connector_cleanup(connector);
  73 }
  74
  75 static enum drm_connector_status
  76 fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force)
  77 {
  78         return connector_status_connected;
  79 }
  80
  81 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  82         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  83         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  84         .destroy = fsl_dcu_drm_connector_destroy,
  85         .detect = fsl_dcu_drm_connector_detect,
  86         .dpms = drm_atomic_helper_connector_dpms,
  87         .fill_modes = drm_helper_probe_single_connector_modes,
  88         .reset = drm_atomic_helper_connector_reset,
  89 };
  90
  91 static struct drm_encoder *
  92 fsl_dcu_drm_connector_best_encoder(struct drm_connector *connector)
  93 {
  94         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  95
  96         return fsl_con->encoder;
  97 }
  98
  99 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 100 {
 101         struct fsl_dcu_drm_connector *fsl_connector;
 102         int (*get_modes)(struct drm_panel *panel);
 103         int num_modes = 0;
 104
 105         fsl_connector = to_fsl_dcu_connector(connector);
 106         if (fsl_connector->panel && fsl_connector->panel->funcs &&
 107             fsl_connector->panel->funcs->get_modes) {
 108                 get_modes = fsl_connector->panel->funcs->get_modes;
 109                 num_modes = get_modes(fsl_connector->panel);
 110         }
 111
 112         return num_modes;
 113 }
 114
 115 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 116                                             struct drm_display_mode *mode)
 117 {
 118         if (mode->hdisplay & 0xf)
 119                 return MODE_ERROR;
 120
 121         return MODE_OK;
 122 }
 123
 124 static const struct drm_connector_helper_funcs connector_helper_funcs = {
 125         .best_encoder = fsl_dcu_drm_connector_best_encoder,
 126         .get_modes = fsl_dcu_drm_connector_get_modes,
 127         .mode_valid = fsl_dcu_drm_connector_mode_valid,
 128 };
 129
 130 int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 131                                  struct drm_encoder *encoder)
 132 {
 133         struct drm_connector *connector = &fsl_dev->connector.base;
 134         struct drm_mode_config mode_config = fsl_dev->drm->mode_config;
 135         struct device_node *panel_node;
 136         int ret;
 137
 138         fsl_dev->connector.encoder = encoder;
 139
 140         ret = drm_connector_init(fsl_dev->drm, connector,
 141                                  &fsl_dcu_drm_connector_funcs,
 142                                  DRM_MODE_CONNECTOR_LVDS);
 143         if (ret < 0)
 144                 return ret;
 145
 146         drm_connector_helper_add(connector, &connector_helper_funcs);
 147         ret = drm_connector_register(connector);
 148         if (ret < 0)
 149                 goto err_cleanup;
 150
 151         ret = drm_mode_connector_attach_encoder(connector, encoder);
 152         if (ret < 0)
 153                 goto err_sysfs;
 154
 155         drm_object_property_set_value(&connector->base,
 156                                       mode_config.dpms_property,
 157                                       DRM_MODE_DPMS_OFF);
 158
 159         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 160         if (panel_node) {
 161                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 162                 if (!fsl_dev->connector.panel) {
 163                         ret = -EPROBE_DEFER;
 164                         goto err_sysfs;
 165                 }
 166         of_node_put(panel_node);
 167         }
 168
 169         ret = drm_panel_attach(fsl_dev->connector.panel, connector);
 170         if (ret) {
 171                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 172                 goto err_sysfs;
 173         }
 174
 175         return 0;
 176
 177 err_sysfs:
 178         drm_connector_unregister(connector);
 179 err_cleanup:
 180         drm_connector_cleanup(connector);
 181         return ret;
 182 }