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

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Copyright 2015 Freescale Semiconductor, Inc.
   4 *
   5 * Freescale DCU drm device driver
   6 */
   7
   8#include <linux/backlight.h>
   9#include <linux/of_graph.h>
  10
  11#include <drm/drmP.h>
  12#include <drm/drm_atomic_helper.h>
  13#include <drm/drm_of.h>
  14#include <drm/drm_panel.h>
  15#include <drm/drm_probe_helper.h>
  16
  17#include "fsl_dcu_drm_drv.h"
  18#include "fsl_tcon.h"
  19
  20static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
  21{
  22        drm_encoder_cleanup(encoder);
  23}
  24
  25static const struct drm_encoder_funcs encoder_funcs = {
  26        .destroy = fsl_dcu_drm_encoder_destroy,
  27};
  28
  29int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
  30                               struct drm_crtc *crtc)
  31{
  32        struct drm_encoder *encoder = &fsl_dev->encoder;
  33        int ret;
  34
  35        encoder->possible_crtcs = 1;
  36
  37        /* Use bypass mode for parallel RGB/LVDS encoder */
  38        if (fsl_dev->tcon)
  39                fsl_tcon_bypass_enable(fsl_dev->tcon);
  40
  41        ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
  42                               DRM_MODE_ENCODER_LVDS, NULL);
  43        if (ret < 0)
  44                return ret;
  45
  46        return 0;
  47}
  48
  49static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
  50{
  51        struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
  52
  53        drm_connector_unregister(connector);
  54        drm_panel_detach(fsl_con->panel);
  55        drm_connector_cleanup(connector);
  56}
  57
  58static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
  59        .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  60        .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  61        .destroy = fsl_dcu_drm_connector_destroy,
  62        .fill_modes = drm_helper_probe_single_connector_modes,
  63        .reset = drm_atomic_helper_connector_reset,
  64};
  65
  66static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
  67{
  68        struct fsl_dcu_drm_connector *fsl_connector;
  69        int (*get_modes)(struct drm_panel *panel);
  70        int num_modes = 0;
  71
  72        fsl_connector = to_fsl_dcu_connector(connector);
  73        if (fsl_connector->panel && fsl_connector->panel->funcs &&
  74            fsl_connector->panel->funcs->get_modes) {
  75                get_modes = fsl_connector->panel->funcs->get_modes;
  76                num_modes = get_modes(fsl_connector->panel);
  77        }
  78
  79        return num_modes;
  80}
  81
  82static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
  83                                            struct drm_display_mode *mode)
  84{
  85        if (mode->hdisplay & 0xf)
  86                return MODE_ERROR;
  87
  88        return MODE_OK;
  89}
  90
  91static const struct drm_connector_helper_funcs connector_helper_funcs = {
  92        .get_modes = fsl_dcu_drm_connector_get_modes,
  93        .mode_valid = fsl_dcu_drm_connector_mode_valid,
  94};
  95
  96static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
  97                                 struct drm_panel *panel)
  98{
  99        struct drm_encoder *encoder = &fsl_dev->encoder;
 100        struct drm_connector *connector = &fsl_dev->connector.base;
 101        int ret;
 102
 103        fsl_dev->connector.encoder = encoder;
 104
 105        ret = drm_connector_init(fsl_dev->drm, connector,
 106                                 &fsl_dcu_drm_connector_funcs,
 107                                 DRM_MODE_CONNECTOR_LVDS);
 108        if (ret < 0)
 109                return ret;
 110
 111        drm_connector_helper_add(connector, &connector_helper_funcs);
 112        ret = drm_connector_register(connector);
 113        if (ret < 0)
 114                goto err_cleanup;
 115
 116        ret = drm_connector_attach_encoder(connector, encoder);
 117        if (ret < 0)
 118                goto err_sysfs;
 119
 120        ret = drm_panel_attach(panel, connector);
 121        if (ret) {
 122                dev_err(fsl_dev->dev, "failed to attach panel\n");
 123                goto err_sysfs;
 124        }
 125
 126        return 0;
 127
 128err_sysfs:
 129        drm_connector_unregister(connector);
 130err_cleanup:
 131        drm_connector_cleanup(connector);
 132        return ret;
 133}
 134
 135int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
 136{
 137        struct device_node *panel_node;
 138        struct drm_panel *panel;
 139        struct drm_bridge *bridge;
 140        int ret;
 141
 142        /* This is for backward compatibility */
 143        panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
 144        if (panel_node) {
 145                fsl_dev->connector.panel = of_drm_find_panel(panel_node);
 146                of_node_put(panel_node);
 147                if (IS_ERR(fsl_dev->connector.panel))
 148                        return PTR_ERR(fsl_dev->connector.panel);
 149
 150                return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
 151        }
 152
 153        ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
 154        if (ret)
 155                return ret;
 156
 157        if (panel) {
 158                fsl_dev->connector.panel = panel;
 159                return fsl_dcu_attach_panel(fsl_dev, panel);
 160        }
 161
 162        return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
 163}
 164