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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
*/
#include <linux/clk.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <drm/bridge/dw_hdmi.h>
#include <drm/drm_modes.h>
struct imx8mp_hdmi {
struct dw_hdmi_plat_data plat_data;
struct dw_hdmi *dw_hdmi;
struct clk *pixclk;
};
static enum drm_mode_status
imx8mp_hdmi_mode_valid(struct dw_hdmi *dw_hdmi, void *data,
const struct drm_display_info *info,
const struct drm_display_mode *mode)
{
struct imx8mp_hdmi *hdmi = (struct imx8mp_hdmi *)data;
long round_rate;
if (mode->clock < 13500)
return MODE_CLOCK_LOW;
if (mode->clock > 297000)
return MODE_CLOCK_HIGH;
round_rate = clk_round_rate(hdmi->pixclk, mode->clock * 1000);
/* imx8mp's pixel clock generator (fsl-samsung-hdmi) cannot generate
* all possible frequencies, so allow some tolerance to support more
* modes.
* Allow 0.5% difference allowed in various standards (VESA, CEA861)
* 0.5% = 5/1000 tolerance (mode->clock is 1/1000)
*/
if (abs(round_rate - mode->clock * 1000) > mode->clock * 5)
return MODE_CLOCK_RANGE;
/* We don't support double-clocked and Interlaced modes */
if ((mode->flags & DRM_MODE_FLAG_DBLCLK) ||
(mode->flags & DRM_MODE_FLAG_INTERLACE))
return MODE_BAD;
return MODE_OK;
}
static int imx8mp_hdmi_phy_init(struct dw_hdmi *dw_hdmi, void *data,
const struct drm_display_info *display,
const struct drm_display_mode *mode)
{
return 0;
}
static void imx8mp_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
{
}
static void im8mp_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data)
{
/*
* Just release PHY core from reset, all other power management is done
* by the PHY driver.
*/
dw_hdmi_phy_gen1_reset(hdmi);
dw_hdmi_phy_setup_hpd(hdmi, data);
}
static const struct dw_hdmi_phy_ops imx8mp_hdmi_phy_ops = {
.init = imx8mp_hdmi_phy_init,
.disable = imx8mp_hdmi_phy_disable,
.setup_hpd = im8mp_hdmi_phy_setup_hpd,
.read_hpd = dw_hdmi_phy_read_hpd,
.update_hpd = dw_hdmi_phy_update_hpd,
};
static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_hdmi_plat_data *plat_data;
struct imx8mp_hdmi *hdmi;
hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
if (!hdmi)
return -ENOMEM;
plat_data = &hdmi->plat_data;
hdmi->pixclk = devm_clk_get(dev, "pix");
if (IS_ERR(hdmi->pixclk))
return dev_err_probe(dev, PTR_ERR(hdmi->pixclk),
"Unable to get pixel clock\n");
plat_data->mode_valid = imx8mp_hdmi_mode_valid;
plat_data->phy_ops = &imx8mp_hdmi_phy_ops;
plat_data->phy_name = "SAMSUNG HDMI TX PHY";
plat_data->priv_data = hdmi;
plat_data->phy_force_vendor = true;
hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
if (IS_ERR(hdmi->dw_hdmi))
return PTR_ERR(hdmi->dw_hdmi);
platform_set_drvdata(pdev, hdmi);
return 0;
}
static void imx8mp_dw_hdmi_remove(struct platform_device *pdev)
{
struct imx8mp_hdmi *hdmi = platform_get_drvdata(pdev);
dw_hdmi_remove(hdmi->dw_hdmi);
}
static int imx8mp_dw_hdmi_pm_suspend(struct device *dev)
{
return 0;
}
static int imx8mp_dw_hdmi_pm_resume(struct device *dev)
{
struct imx8mp_hdmi *hdmi = dev_get_drvdata(dev);
dw_hdmi_resume(hdmi->dw_hdmi);
return 0;
}
static const struct dev_pm_ops imx8mp_dw_hdmi_pm_ops = {
SYSTEM_SLEEP_PM_OPS(imx8mp_dw_hdmi_pm_suspend, imx8mp_dw_hdmi_pm_resume)
};
static const struct of_device_id imx8mp_dw_hdmi_of_table[] = {
{ .compatible = "fsl,imx8mp-hdmi-tx" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx8mp_dw_hdmi_of_table);
static struct platform_driver imx8mp_dw_hdmi_platform_driver = {
.probe = imx8mp_dw_hdmi_probe,
.remove = imx8mp_dw_hdmi_remove,
.driver = {
.name = "imx8mp-dw-hdmi-tx",
.of_match_table = imx8mp_dw_hdmi_of_table,
.pm = pm_ptr(&imx8mp_dw_hdmi_pm_ops),
},
};
module_platform_driver(imx8mp_dw_hdmi_platform_driver);
MODULE_DESCRIPTION("i.MX8MP HDMI encoder driver");
MODULE_LICENSE("GPL");
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