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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2021 StarFive Technology Co., Ltd.
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/platform_device.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_atomic_uapi.h>
#include <drm/drm_fb_dma_helper.h>
#include <drm/drm_print.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include <drm/drm_of.h>
#include "starfive_drm_drv.h"
#include "starfive_drm_encoder.h"
static void starfive_encoder_destroy(struct drm_encoder *encoder)
{
drm_encoder_cleanup(encoder);
kfree(encoder);
}
static const struct drm_encoder_funcs starfive_encoder_funcs = {
.destroy = starfive_encoder_destroy,
};
static int starfive_encoder_bind(struct device *dev, struct device *master, void *data)
{
struct drm_device *drm_dev = data;
struct device_node *np = dev->of_node;
struct starfive_encoder *encoderp;
int ret;
struct drm_panel *tmp_panel;
struct drm_bridge *tmp_bridge;
u32 crtcs = 0;
encoderp = devm_kzalloc(dev, sizeof(*encoderp), GFP_KERNEL);
if (!encoderp)
return -ENOMEM;
encoderp->dev = dev;
encoderp->drm_dev = drm_dev;
dev_set_drvdata(dev, encoderp);
if (dev->of_node) {
crtcs = drm_of_find_possible_crtcs(drm_dev, dev->of_node);
if (of_property_read_u32(np, "encoder-type", &encoderp->encoder_type)) {
DRM_ERROR("Missing encoder-type property in the DT.\n");
encoderp->encoder_type = DRM_MODE_ENCODER_TMDS;
}
}
/* If no CRTCs were found, fall back to our old behaviour */
if (crtcs == 0) {
dev_warn(dev, "Falling back to first CRTC\n");
crtcs = 1 << 0;
}
encoderp->encoder.possible_crtcs = crtcs;
ret = drm_encoder_init(drm_dev, &encoderp->encoder,
&starfive_encoder_funcs,
encoderp->encoder_type, NULL);
if (ret)
return dev_err_probe(dev, ret, "error initializing encoder\n");
ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0,
&tmp_panel, &tmp_bridge);
if (ret) {
dev_err_probe(dev, ret, "endpoint returns %d\n", ret);
goto err_bridge;
}
if (tmp_panel)
DRM_INFO("found panel on endpoint\n");
if (tmp_bridge)
DRM_INFO("found bridge on endpoint\n");
ret = drm_bridge_attach(&encoderp->encoder, tmp_bridge, NULL, 0);
if (ret)
goto err_bridge;
return 0;
err_bridge:
drm_encoder_cleanup(&encoderp->encoder);
return ret;
}
static void starfive_encoder_unbind(struct device *dev, struct device *master, void *data)
{
struct starfive_encoder *encoderp = dev_get_drvdata(dev);
starfive_encoder_destroy(&encoderp->encoder);
}
static const struct component_ops starfive_encoder_component_ops = {
.bind = starfive_encoder_bind,
.unbind = starfive_encoder_unbind,
};
static const struct of_device_id starfive_encoder_driver_dt_match[] = {
{ .compatible = "starfive,display-encoder" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, starfive_encoder_driver_dt_match);
static int starfive_encoder_probe(struct platform_device *pdev)
{
return component_add(&pdev->dev, &starfive_encoder_component_ops);
}
static int starfive_encoder_remove(struct platform_device *pdev)
{
component_del(&pdev->dev, &starfive_encoder_component_ops);
return 0;
}
struct platform_driver starfive_encoder_driver = {
.probe = starfive_encoder_probe,
.remove = starfive_encoder_remove,
.driver = {
.name = "display-encoder",
.of_match_table = of_match_ptr(starfive_encoder_driver_dt_match),
},
};
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