1// SPDX-License-Identifier: GPL-2.0+
  2
  3/*
  4 * Copyright (C) 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
  5 */
  6
  7#include <linux/clk.h>
  8#include <linux/mod_devicetable.h>
  9#include <linux/module.h>
 10#include <linux/platform_device.h>
 11#include <drm/bridge/dw_hdmi.h>
 12#include <drm/drm_modes.h>
 13
 14struct imx8mp_hdmi {
 15	struct dw_hdmi_plat_data plat_data;
 16	struct dw_hdmi *dw_hdmi;
 17	struct clk *pixclk;
 18};
 19
 20static enum drm_mode_status
 21imx8mp_hdmi_mode_valid(struct dw_hdmi *dw_hdmi, void *data,
 22		       const struct drm_display_info *info,
 23		       const struct drm_display_mode *mode)
 24{
 25	struct imx8mp_hdmi *hdmi = (struct imx8mp_hdmi *)data;
 26
 27	if (mode->clock < 13500)
 28		return MODE_CLOCK_LOW;
 29
 30	if (mode->clock > 297000)
 31		return MODE_CLOCK_HIGH;
 32
 33	if (clk_round_rate(hdmi->pixclk, mode->clock * 1000) !=
 34	    mode->clock * 1000)
 35		return MODE_CLOCK_RANGE;
 36
 37	/* We don't support double-clocked and Interlaced modes */
 38	if ((mode->flags & DRM_MODE_FLAG_DBLCLK) ||
 39	    (mode->flags & DRM_MODE_FLAG_INTERLACE))
 40		return MODE_BAD;
 41
 42	return MODE_OK;
 43}
 44
 45static int imx8mp_hdmi_phy_init(struct dw_hdmi *dw_hdmi, void *data,
 46				const struct drm_display_info *display,
 47				const struct drm_display_mode *mode)
 48{
 49	return 0;
 50}
 51
 52static void imx8mp_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
 53{
 54}
 55
 56static void im8mp_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data)
 57{
 58	/*
 59	 * Just release PHY core from reset, all other power management is done
 60	 * by the PHY driver.
 61	 */
 62	dw_hdmi_phy_gen1_reset(hdmi);
 63
 64	dw_hdmi_phy_setup_hpd(hdmi, data);
 65}
 66
 67static const struct dw_hdmi_phy_ops imx8mp_hdmi_phy_ops = {
 68	.init		= imx8mp_hdmi_phy_init,
 69	.disable	= imx8mp_hdmi_phy_disable,
 70	.setup_hpd	= im8mp_hdmi_phy_setup_hpd,
 71	.read_hpd	= dw_hdmi_phy_read_hpd,
 72	.update_hpd	= dw_hdmi_phy_update_hpd,
 73};
 74
 75static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
 76{
 77	struct device *dev = &pdev->dev;
 78	struct dw_hdmi_plat_data *plat_data;
 79	struct imx8mp_hdmi *hdmi;
 80
 81	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 82	if (!hdmi)
 83		return -ENOMEM;
 84
 85	plat_data = &hdmi->plat_data;
 86
 87	hdmi->pixclk = devm_clk_get(dev, "pix");
 88	if (IS_ERR(hdmi->pixclk))
 89		return dev_err_probe(dev, PTR_ERR(hdmi->pixclk),
 90				     "Unable to get pixel clock\n");
 91
 92	plat_data->mode_valid = imx8mp_hdmi_mode_valid;
 93	plat_data->phy_ops = &imx8mp_hdmi_phy_ops;
 94	plat_data->phy_name = "SAMSUNG HDMI TX PHY";
 95	plat_data->priv_data = hdmi;
 96	plat_data->phy_force_vendor = true;
 97
 98	hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
 99	if (IS_ERR(hdmi->dw_hdmi))
100		return PTR_ERR(hdmi->dw_hdmi);
101
102	platform_set_drvdata(pdev, hdmi);
103
104	return 0;
105}
106
107static int imx8mp_dw_hdmi_remove(struct platform_device *pdev)
108{
109	struct imx8mp_hdmi *hdmi = platform_get_drvdata(pdev);
110
111	dw_hdmi_remove(hdmi->dw_hdmi);
112
113	return 0;
114}
115
116static int __maybe_unused imx8mp_dw_hdmi_pm_suspend(struct device *dev)
117{
118	return 0;
119}
120
121static int __maybe_unused imx8mp_dw_hdmi_pm_resume(struct device *dev)
122{
123	struct imx8mp_hdmi *hdmi = dev_get_drvdata(dev);
124
125	dw_hdmi_resume(hdmi->dw_hdmi);
126
127	return 0;
128}
129
130static const struct dev_pm_ops imx8mp_dw_hdmi_pm_ops = {
131	SET_SYSTEM_SLEEP_PM_OPS(imx8mp_dw_hdmi_pm_suspend,
132				imx8mp_dw_hdmi_pm_resume)
133};
134
135static const struct of_device_id imx8mp_dw_hdmi_of_table[] = {
136	{ .compatible = "fsl,imx8mp-hdmi-tx" },
137	{ /* Sentinel */ }
138};
139MODULE_DEVICE_TABLE(of, imx8mp_dw_hdmi_of_table);
140
141static struct platform_driver imx8mp_dw_hdmi_platform_driver = {
142	.probe		= imx8mp_dw_hdmi_probe,
143	.remove		= imx8mp_dw_hdmi_remove,
144	.driver		= {
145		.name	= "imx8mp-dw-hdmi-tx",
146		.of_match_table = imx8mp_dw_hdmi_of_table,
147		.pm = &imx8mp_dw_hdmi_pm_ops,
148	},
149};
150
151module_platform_driver(imx8mp_dw_hdmi_platform_driver);
152
153MODULE_DESCRIPTION("i.MX8MP HDMI encoder driver");
154MODULE_LICENSE("GPL");