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 #include "fsl_tcon.h"
  21
  22 static int
  23 fsl_dcu_drm_encoder_atomic_check(struct drm_encoder *encoder,
  24                                  struct drm_crtc_state *crtc_state,
  25                                  struct drm_connector_state *conn_state)
  26 {
  27         return 0;
  28 }
  29
  30 static void fsl_dcu_drm_encoder_disable(struct drm_encoder *encoder)
  31 {
  32         struct drm_device *dev = encoder->dev;
  33         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  34
  35         if (fsl_dev->tcon)
  36                 fsl_tcon_bypass_disable(fsl_dev->tcon);
  37 }
  38
  39 static void fsl_dcu_drm_encoder_enable(struct drm_encoder *encoder)
  40 {
  41         struct drm_device *dev = encoder->dev;
  42         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  43
  44         if (fsl_dev->tcon)
  45                 fsl_tcon_bypass_enable(fsl_dev->tcon);
  46 }
  47
  48 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  49         .atomic_check = fsl_dcu_drm_encoder_atomic_check,
  50         .disable = fsl_dcu_drm_encoder_disable,
  51         .enable = fsl_dcu_drm_encoder_enable,
  52 };
  53
  54 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  55 {
  56         drm_encoder_cleanup(encoder);
  57 }
  58
  59 static const struct drm_encoder_funcs encoder_funcs = {
  60         .destroy = fsl_dcu_drm_encoder_destroy,
  61 };
  62
  63 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  64                                struct drm_crtc *crtc)
  65 {
  66         struct drm_encoder *encoder = &fsl_dev->encoder;
  67         int ret;
  68
  69         encoder->possible_crtcs = 1;
  70         ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  71                                DRM_MODE_ENCODER_LVDS, NULL);
  72         if (ret < 0)
  73                 return ret;
  74
  75         drm_encoder_helper_add(encoder, &encoder_helper_funcs);
  76
  77         return 0;
  78 }
  79
  80 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  81 {
  82         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  83
  84         drm_connector_unregister(connector);
  85         drm_panel_detach(fsl_con->panel);
  86         drm_connector_cleanup(connector);
  87 }
  88
  89 static enum drm_connector_status
  90 fsl_dcu_drm_connector_detect(struct drm_connector *connector, bool force)
  91 {
  92         return connector_status_connected;
  93 }
  94
  95 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  96         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  97         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  98         .destroy = fsl_dcu_drm_connector_destroy,
  99         .detect = fsl_dcu_drm_connector_detect,
 100         .dpms = drm_atomic_helper_connector_dpms,
 101         .fill_modes = drm_helper_probe_single_connector_modes,
 102         .reset = drm_atomic_helper_connector_reset,
 103 };
 104
 105 static struct drm_encoder *
 106 fsl_dcu_drm_connector_best_encoder(struct drm_connector *connector)
 107 {
 108         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
 109
 110         return fsl_con->encoder;
 111 }
 112
 113 static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 114 {
 115         struct fsl_dcu_drm_connector *fsl_connector;
 116         int (*get_modes)(struct drm_panel *panel);
 117         int num_modes = 0;
 118
 119         fsl_connector = to_fsl_dcu_connector(connector);
 120         if (fsl_connector->panel && fsl_connector->panel->funcs &&
 121             fsl_connector->panel->funcs->get_modes) {
 122                 get_modes = fsl_connector->panel->funcs->get_modes;
 123                 num_modes = get_modes(fsl_connector->panel);
 124         }
 125
 126         return num_modes;
 127 }
 128
 129 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 130                                             struct drm_display_mode *mode)
 131 {
 132         if (mode->hdisplay & 0xf)
 133                 return MODE_ERROR;
 134
 135         return MODE_OK;
 136 }
 137
 138 static const struct drm_connector_helper_funcs connector_helper_funcs = {
 139         .best_encoder = fsl_dcu_drm_connector_best_encoder,
 140         .get_modes = fsl_dcu_drm_connector_get_modes,
 141         .mode_valid = fsl_dcu_drm_connector_mode_valid,
 142 };
 143
 144 int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 145                                  struct drm_encoder *encoder)
 146 {
 147         struct drm_connector *connector = &fsl_dev->connector.base;
 148         struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
 149         struct device_node *panel_node;
 150         int ret;
 151
 152         fsl_dev->connector.encoder = encoder;
 153
 154         ret = drm_connector_init(fsl_dev->drm, connector,
 155                                  &fsl_dcu_drm_connector_funcs,
 156                                  DRM_MODE_CONNECTOR_LVDS);
 157         if (ret < 0)
 158                 return ret;
 159
 160         drm_connector_helper_add(connector, &connector_helper_funcs);
 161         ret = drm_connector_register(connector);
 162         if (ret < 0)
 163                 goto err_cleanup;
 164
 165         ret = drm_mode_connector_attach_encoder(connector, encoder);
 166         if (ret < 0)
 167                 goto err_sysfs;
 168
 169         drm_object_property_set_value(&connector->base,
 170                                       mode_config->dpms_property,
 171                                       DRM_MODE_DPMS_OFF);
 172
 173         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 174         if (!panel_node) {
 175                 dev_err(fsl_dev->dev, "fsl,panel property not found\n");
 176                 ret = -ENODEV;
 177                 goto err_sysfs;
 178         }
 179
 180         fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 181         if (!fsl_dev->connector.panel) {
 182                 ret = -EPROBE_DEFER;
 183                 goto err_panel;
 184         }
 185         of_node_put(panel_node);
 186
 187         ret = drm_panel_attach(fsl_dev->connector.panel, connector);
 188         if (ret) {
 189                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 190                 goto err_sysfs;
 191         }
 192
 193         return 0;
 194
 195 err_panel:
 196         of_node_put(panel_node);
 197 err_sysfs:
 198         drm_connector_unregister(connector);
 199 err_cleanup:
 200         drm_connector_cleanup(connector);
 201         return ret;
 202 }