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_of.h>
  19 #include <drm/drm_panel.h>
  20
  21 #include "fsl_dcu_drm_drv.h"
  22 #include "fsl_tcon.h"
  23
  24 static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  25 {
  26         drm_encoder_cleanup(encoder);
  27 }
  28
  29 static const struct drm_encoder_funcs encoder_funcs = {
  30         .destroy = fsl_dcu_drm_encoder_destroy,
  31 };
  32
  33 int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  34                                struct drm_crtc *crtc)
  35 {
  36         struct drm_encoder *encoder = &fsl_dev->encoder;
  37         int ret;
  38
  39         encoder->possible_crtcs = 1;
  40
  41         /* Use bypass mode for parallel RGB/LVDS encoder */
  42         if (fsl_dev->tcon)
  43                 fsl_tcon_bypass_enable(fsl_dev->tcon);
  44
  45         ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  46                                DRM_MODE_ENCODER_LVDS, NULL);
  47         if (ret < 0)
  48                 return ret;
  49
  50         return 0;
  51 }
  52
  53 static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  54 {
  55         struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  56
  57         drm_connector_unregister(connector);
  58         drm_panel_detach(fsl_con->panel);
  59         drm_connector_cleanup(connector);
  60 }
  61
  62 static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  63         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  64         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  65         .destroy = fsl_dcu_drm_connector_destroy,
  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         int ret;
 106
 107         fsl_dev->connector.encoder = encoder;
 108
 109         ret = drm_connector_init(fsl_dev->drm, connector,
 110                                  &fsl_dcu_drm_connector_funcs,
 111                                  DRM_MODE_CONNECTOR_LVDS);
 112         if (ret < 0)
 113                 return ret;
 114
 115         drm_connector_helper_add(connector, &connector_helper_funcs);
 116         ret = drm_connector_register(connector);
 117         if (ret < 0)
 118                 goto err_cleanup;
 119
 120         ret = drm_connector_attach_encoder(connector, encoder);
 121         if (ret < 0)
 122                 goto err_sysfs;
 123
 124         ret = drm_panel_attach(panel, connector);
 125         if (ret) {
 126                 dev_err(fsl_dev->dev, "failed to attach panel\n");
 127                 goto err_sysfs;
 128         }
 129
 130         return 0;
 131
 132 err_sysfs:
 133         drm_connector_unregister(connector);
 134 err_cleanup:
 135         drm_connector_cleanup(connector);
 136         return ret;
 137 }
 138
 139 int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 140 {
 141         struct device_node *panel_node;
 142         struct drm_panel *panel;
 143         struct drm_bridge *bridge;
 144         int ret;
 145
 146         /* This is for backward compatibility */
 147         panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 148         if (panel_node) {
 149                 fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 150                 of_node_put(panel_node);
 151                 if (IS_ERR(fsl_dev->connector.panel))
 152                         return PTR_ERR(fsl_dev->connector.panel);
 153
 154                 return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 155         }
 156
 157         ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 158         if (ret)
 159                 return ret;
 160
 161         if (panel) {
 162                 fsl_dev->connector.panel = panel;
 163                 return fsl_dcu_attach_panel(fsl_dev, panel);
 164         }
 165
 166         return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
 167 }