// SPDX-License-Identifier: GPL-2.0
/*
* ZynqMP DisplayPort Subsystem Driver
*
* Copyright (C) 2017 - 2020 Xilinx, Inc.
*
* Authors:
* - Hyun Woo Kwon <[email protected]>
* - Laurent Pinchart <[email protected]>
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_modeset_helper.h>
#include <drm/drm_module.h>
#include "zynqmp_disp.h"
#include "zynqmp_dp.h"
#include "zynqmp_dpsub.h"
#include "zynqmp_kms.h"
/* -----------------------------------------------------------------------------
* Power Management
*/
static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
{
struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
if (!dpsub->drm)
return 0;
return drm_mode_config_helper_suspend(&dpsub->drm->dev);
}
static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
{
struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
if (!dpsub->drm)
return 0;
return drm_mode_config_helper_resume(&dpsub->drm->dev);
}
static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
};
/* -----------------------------------------------------------------------------
* DPSUB Configuration
*/
/**
* zynqmp_dpsub_audio_enabled - If the audio is enabled
* @dpsub: DisplayPort subsystem
*
* Return if the audio is enabled depending on the audio clock.
*
* Return: true if audio is enabled, or false.
*/
bool zynqmp_dpsub_audio_enabled(struct zynqmp_dpsub *dpsub)
{
return !!dpsub->aud_clk;
}
/**
* zynqmp_dpsub_get_audio_clk_rate - Get the current audio clock rate
* @dpsub: DisplayPort subsystem
*
* Return: the current audio clock rate.
*/
unsigned int zynqmp_dpsub_get_audio_clk_rate(struct zynqmp_dpsub *dpsub)
{
if (zynqmp_dpsub_audio_enabled(dpsub))
return 0;
return clk_get_rate(dpsub->aud_clk);
}
/* -----------------------------------------------------------------------------
* Probe & Remove
*/
static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
{
int ret;
dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
if (IS_ERR(dpsub->apb_clk))
return PTR_ERR(dpsub->apb_clk);
ret = clk_prepare_enable(dpsub->apb_clk);
if (ret) {
dev_err(dpsub->dev, "failed to enable the APB clock\n");
return ret;
}
/*
* Try the live PL video clock, and fall back to the PS clock if the
* live PL video clock isn't valid.
*/
dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_live_video_in_clk");
if (!IS_ERR(dpsub->vid_clk))
dpsub->vid_clk_from_ps = false;
else if (PTR_ERR(dpsub->vid_clk) == -EPROBE_DEFER)
return PTR_ERR(dpsub->vid_clk);
if (IS_ERR_OR_NULL(dpsub->vid_clk)) {
dpsub->vid_clk = devm_clk_get(dpsub->dev, "dp_vtc_pixel_clk_in");
if (IS_ERR(dpsub->vid_clk)) {
dev_err(dpsub->dev, "failed to init any video clock\n");
return PTR_ERR(dpsub->vid_clk);
}
dpsub->vid_clk_from_ps = true;
}
/*
* Try the live PL audio clock, and fall back to the PS clock if the
* live PL audio clock isn't valid. Missing audio clock disables audio
* but isn't an error.
*/
dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_live_audio_aclk");
if (!IS_ERR(dpsub->aud_clk)) {
dpsub->aud_clk_from_ps = false;
return 0;
}
dpsub->aud_clk = devm_clk_get(dpsub->dev, "dp_aud_clk");
if (!IS_ERR(dpsub->aud_clk)) {
dpsub->aud_clk_from_ps = true;
return 0;
}
dev_info(dpsub->dev, "audio disabled due to missing clock\n");
return 0;
}
static int zynqmp_dpsub_parse_dt(struct zynqmp_dpsub *dpsub)
{
struct device_node *np;
unsigned int i;
/*
* For backward compatibility with old device trees that don't contain
* ports, consider that only the DP output port is connected if no
* ports child no exists.
*/
np = of_get_child_by_name(dpsub->dev->of_node, "ports");
of_node_put(np);
if (!np) {
dev_warn(dpsub->dev, "missing ports, update DT bindings\n");
dpsub->connected_ports = BIT(ZYNQMP_DPSUB_PORT_OUT_DP);
dpsub->dma_enabled = true;
return 0;
}
/* Check which ports are connected. */
for (i = 0; i < ZYNQMP_DPSUB_NUM_PORTS; ++i) {
struct device_node *np;
np = of_graph_get_remote_node(dpsub->dev->of_node, i, -1);
if (np) {
dpsub->connected_ports |= BIT(i);
of_node_put(np);
}
}
/* Sanity checks. */
if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) &&
(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
dev_err(dpsub->dev, "only one live video input is supported\n");
return -EINVAL;
}
if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) ||
(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX))) {
if (dpsub->vid_clk_from_ps) {
dev_err(dpsub->dev,
"live video input requires PL clock\n");
return -EINVAL;
}
} else {
dpsub->dma_enabled = true;
}
if (dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_AUDIO))
dev_warn(dpsub->dev, "live audio unsupported, ignoring\n");
if ((dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_VIDEO)) ||
(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_AUDIO)))
dev_warn(dpsub->dev, "output to PL unsupported, ignoring\n");
if (!(dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_OUT_DP))) {
dev_err(dpsub->dev, "DP output port not connected\n");
return -EINVAL;
}
return 0;
}
void zynqmp_dpsub_release(struct zynqmp_dpsub *dpsub)
{
kfree(dpsub->disp);
kfree(dpsub->dp);
kfree(dpsub);
}
static int zynqmp_dpsub_probe(struct platform_device *pdev)
{
struct zynqmp_dpsub *dpsub;
int ret;
/* Allocate private data. */
dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL);
if (!dpsub)
return -ENOMEM;
dpsub->dev = &pdev->dev;
platform_set_drvdata(pdev, dpsub);
ret = dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
if (ret)
return ret;
/* Try the reserved memory. Proceed if there's none. */
of_reserved_mem_device_init(&pdev->dev);
ret = zynqmp_dpsub_init_clocks(dpsub);
if (ret < 0)
goto err_mem;
ret = zynqmp_dpsub_parse_dt(dpsub);
if (ret < 0)
goto err_mem;
pm_runtime_enable(&pdev->dev);
/*
* DP should be probed first so that the zynqmp_disp can set the output
* format accordingly.
*/
ret = zynqmp_dp_probe(dpsub);
if (ret)
goto err_pm;
ret = zynqmp_disp_probe(dpsub);
if (ret)
goto err_dp;
drm_bridge_add(dpsub->bridge);
if (dpsub->dma_enabled) {
ret = zynqmp_dpsub_drm_init(dpsub);
if (ret)
goto err_disp;
}
dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
return 0;
err_disp:
drm_bridge_remove(dpsub->bridge);
zynqmp_disp_remove(dpsub);
err_dp:
zynqmp_dp_remove(dpsub);
err_pm:
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(dpsub->apb_clk);
err_mem:
of_reserved_mem_device_release(&pdev->dev);
if (!dpsub->drm)
zynqmp_dpsub_release(dpsub);
return ret;
}
static void zynqmp_dpsub_remove(struct platform_device *pdev)
{
struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
if (dpsub->drm)
zynqmp_dpsub_drm_cleanup(dpsub);
drm_bridge_remove(dpsub->bridge);
zynqmp_disp_remove(dpsub);
zynqmp_dp_remove(dpsub);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(dpsub->apb_clk);
of_reserved_mem_device_release(&pdev->dev);
if (!dpsub->drm)
zynqmp_dpsub_release(dpsub);
}
static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
{
struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
if (!dpsub->drm)
return;
drm_atomic_helper_shutdown(&dpsub->drm->dev);
}
static const struct of_device_id zynqmp_dpsub_of_match[] = {
{ .compatible = "xlnx,zynqmp-dpsub-1.7", },
{ /* end of table */ },
};
MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
static struct platform_driver zynqmp_dpsub_driver = {
.probe = zynqmp_dpsub_probe,
.remove_new = zynqmp_dpsub_remove,
.shutdown = zynqmp_dpsub_shutdown,
.driver = {
.name = "zynqmp-dpsub",
.pm = &zynqmp_dpsub_pm_ops,
.of_match_table = zynqmp_dpsub_of_match,
},
};
drm_module_platform_driver(zynqmp_dpsub_driver);
MODULE_AUTHOR("Xilinx, Inc.");
MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
MODULE_LICENSE("GPL v2");
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