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/*
* Copyright 2015 Freescale Semiconductor, Inc.
*
* Freescale DCU drm device driver
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/backlight.h>
#include <linux/of_graph.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include "fsl_dcu_drm_drv.h"
#include "fsl_tcon.h"
static void fsl_dcu_drm_encoder_destroy(struct drm_encoder *encoder)
{
drm_encoder_cleanup(encoder);
}
static const struct drm_encoder_funcs encoder_funcs = {
.destroy = fsl_dcu_drm_encoder_destroy,
};
int fsl_dcu_drm_encoder_create(struct fsl_dcu_drm_device *fsl_dev,
struct drm_crtc *crtc)
{
struct drm_encoder *encoder = &fsl_dev->encoder;
int ret;
encoder->possible_crtcs = 1;
/* Use bypass mode for parallel RGB/LVDS encoder */
if (fsl_dev->tcon)
fsl_tcon_bypass_enable(fsl_dev->tcon);
ret = drm_encoder_init(fsl_dev->drm, encoder, &encoder_funcs,
DRM_MODE_ENCODER_LVDS, NULL);
if (ret < 0)
return ret;
return 0;
}
static void fsl_dcu_drm_connector_destroy(struct drm_connector *connector)
{
struct fsl_dcu_drm_connector *fsl_con = to_fsl_dcu_connector(connector);
drm_connector_unregister(connector);
drm_panel_detach(fsl_con->panel);
drm_connector_cleanup(connector);
}
static const struct drm_connector_funcs fsl_dcu_drm_connector_funcs = {
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.destroy = fsl_dcu_drm_connector_destroy,
.fill_modes = drm_helper_probe_single_connector_modes,
.reset = drm_atomic_helper_connector_reset,
};
static int fsl_dcu_drm_connector_get_modes(struct drm_connector *connector)
{
struct fsl_dcu_drm_connector *fsl_connector;
int (*get_modes)(struct drm_panel *panel);
int num_modes = 0;
fsl_connector = to_fsl_dcu_connector(connector);
if (fsl_connector->panel && fsl_connector->panel->funcs &&
fsl_connector->panel->funcs->get_modes) {
get_modes = fsl_connector->panel->funcs->get_modes;
num_modes = get_modes(fsl_connector->panel);
}
return num_modes;
}
static int fsl_dcu_drm_connector_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
if (mode->hdisplay & 0xf)
return MODE_ERROR;
return MODE_OK;
}
static const struct drm_connector_helper_funcs connector_helper_funcs = {
.get_modes = fsl_dcu_drm_connector_get_modes,
.mode_valid = fsl_dcu_drm_connector_mode_valid,
};
static int fsl_dcu_attach_panel(struct fsl_dcu_drm_device *fsl_dev,
struct drm_panel *panel)
{
struct drm_encoder *encoder = &fsl_dev->encoder;
struct drm_connector *connector = &fsl_dev->connector.base;
int ret;
fsl_dev->connector.encoder = encoder;
ret = drm_connector_init(fsl_dev->drm, connector,
&fsl_dcu_drm_connector_funcs,
DRM_MODE_CONNECTOR_LVDS);
if (ret < 0)
return ret;
drm_connector_helper_add(connector, &connector_helper_funcs);
ret = drm_connector_register(connector);
if (ret < 0)
goto err_cleanup;
ret = drm_connector_attach_encoder(connector, encoder);
if (ret < 0)
goto err_sysfs;
ret = drm_panel_attach(panel, connector);
if (ret) {
dev_err(fsl_dev->dev, "failed to attach panel\n");
goto err_sysfs;
}
return 0;
err_sysfs:
drm_connector_unregister(connector);
err_cleanup:
drm_connector_cleanup(connector);
return ret;
}
int fsl_dcu_create_outputs(struct fsl_dcu_drm_device *fsl_dev)
{
struct device_node *panel_node;
struct drm_panel *panel;
struct drm_bridge *bridge;
int ret;
/* This is for backward compatibility */
panel_node = of_parse_phandle(fsl_dev->np, "fsl,panel", 0);
if (panel_node) {
fsl_dev->connector.panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
if (IS_ERR(fsl_dev->connector.panel))
return PTR_ERR(fsl_dev->connector.panel);
return fsl_dcu_attach_panel(fsl_dev, fsl_dev->connector.panel);
}
ret = drm_of_find_panel_or_bridge(fsl_dev->np, 0, 0, &panel, &bridge);
if (ret)
return ret;
if (panel) {
fsl_dev->connector.panel = panel;
return fsl_dcu_attach_panel(fsl_dev, panel);
}
return drm_bridge_attach(&fsl_dev->encoder, bridge, NULL);
}
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