LXR linux/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm

   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
  24static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  25{
  26        drm_encoder_cleanup(encoder);
  27}
  28
  29static const struct drm_encoder_funcs encoder_funcs = {
  30        .destroy = fsl_dcu_drm_encoder_destroy,
  31};
  32
  33int 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
  53static 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
  62static 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
  70static 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
  86static 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
  95static 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
 100static 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_mode_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
 132err_sysfs:
 133        drm_connector_unregister(connector);
 134err_cleanup:
 135        drm_connector_cleanup(connector);
 136        return ret;
 137}
 138
 139int 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 (!fsl_dev->connector.panel)
 152                        return -EPROBE_DEFER;
 153                return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 154        }
 155
 156        ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 157        if (ret)
 158                return ret;
 159
 160        if (panel) {
 161                fsl_dev->connector.panel = panel;
 162                return fsl_dcu_attach_panel(fsl_dev, panel);
 163        }
 164
 165        return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
 166}
 167