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 int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
 106 {
 107         struct fsl_dcu_drm_connector *fsl_connector;
 108         int (*get_modes)(struct drm_panel *panel);
 109         int num_modes = 0;
 110
 111         fsl_connector = to_fsl_dcu_connector(connector);
 112         if (fsl_connector->panel && fsl_connector->panel->funcs &&
 113             fsl_connector->panel->funcs->get_modes) {
 114                 get_modes = fsl_connector->panel->funcs->get_modes;
 115                 num_modes = get_modes(fsl_connector->panel);
 116         }
 117
 118         return num_modes;
 119 }
 120
 121 static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
 122                                             struct drm_display_mode *mode)
 123 {
 124         if (mode->hdisplay & 0xf)
 125                 return MODE_ERROR;
 126
 127         return MODE_OK;
 128 }
 129
 130 static const struct drm_connector_helper_funcs connector_helper_funcs = {
 131         .get_modes = fsl_dcu_drm_connector_get_modes,
 132         .mode_valid = fsl_dcu_drm_connector_mode_valid,
 133 };
 134
 135 int fsl_dcu_drm_connector_create(struct fsl_dcu_drm_device *fsl_dev,
 136                                  struct drm_encoder *encoder)
 137 {
 138         struct drm_connector *connector = &fsl_dev->connector.base;
 139         struct drm_mode_config *mode_config = &fsl_dev->drm->mode_config;
 140         struct device_node *panel_node;
 141         int ret;
 142
 143         fsl_dev->connector.encoder = encoder;
 144
 145         ret = drm_connector_init(fsl_dev->drm, connector,
 146                                  &fsl_dcu_drm_connector_funcs,
 147                                  DRM_MODE_CONNECTOR_LVDS);
 148         if (ret < 0)
 149                 return ret;
 150
 151         drm_connector_helper_add(connector, &connector_helper_funcs);
 152         ret = drm_connector_register(connector);
 153         if (ret < 0)
 154                 goto err_cleanup;
 155
 156         ret = drm_mode_connector_attach_encoder(connector, encoder);
 157         if (ret < 0)
 158                 goto err_sysfs;
 159
 160         drm_object_property_set_value(&connector->base,
 161                                       mode_config->dpms_property,
 162                                       DRM_MODE_DPMS_OFF);
 163
 164         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 165         if (!panel_node) {
 166                 dev_err(fsl_dev->dev, "fsl,panel property not found\n");
 167                 ret = -ENODEV;
 168                 goto err_sysfs;
 169         }
 170
 171         fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 172         if (!fsl_dev->connector.panel) {
 173                 ret = -EPROBE_DEFER;
 174                 goto err_panel;
 175         }
 176         of_node_put(panel_node);
 177
 178         ret = drm_panel_attach(fsl_dev->connector.panel, connector);
 179         if (ret) {
 180                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 181                 goto err_sysfs;
 182         }
 183
 184         return 0;
 185
 186 err_panel:
 187         of_node_put(panel_node);
 188 err_sysfs:
 189         drm_connector_unregister(connector);
 190 err_cleanup:
 191         drm_connector_cleanup(connector);
 192         return ret;
 193 }