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	long round_rate;
 27
 28	if (mode->clock < 13500)
 29		return MODE_CLOCK_LOW;
 30
 31	if (mode->clock > 297000)
 32		return MODE_CLOCK_HIGH;
 33
 34	round_rate = clk_round_rate(hdmi->pixclk, mode->clock * 1000);
 35	/* imx8mp's pixel clock generator (fsl-samsung-hdmi) cannot generate
 36	 * all possible frequencies, so allow some tolerance to support more
 37	 * modes.
 38	 * Allow 0.5% difference allowed in various standards (VESA, CEA861)
 39	 * 0.5% = 5/1000 tolerance (mode->clock is 1/1000)
 40	 */
 41	if (abs(round_rate - mode->clock * 1000) > mode->clock * 5)
 42		return MODE_CLOCK_RANGE;
 43
 44	/* We don't support double-clocked and Interlaced modes */
 45	if ((mode->flags & DRM_MODE_FLAG_DBLCLK) ||
 46	    (mode->flags & DRM_MODE_FLAG_INTERLACE))
 47		return MODE_BAD;
 48
 49	return MODE_OK;
 50}
 51
 52static int imx8mp_hdmi_phy_init(struct dw_hdmi *dw_hdmi, void *data,
 53				const struct drm_display_info *display,
 54				const struct drm_display_mode *mode)
 55{
 56	return 0;
 57}
 58
 59static void imx8mp_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
 60{
 61}
 62
 63static void im8mp_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data)
 64{
 65	/*
 66	 * Just release PHY core from reset, all other power management is done
 67	 * by the PHY driver.
 68	 */
 69	dw_hdmi_phy_gen1_reset(hdmi);
 70
 71	dw_hdmi_phy_setup_hpd(hdmi, data);
 72}
 73
 74static const struct dw_hdmi_phy_ops imx8mp_hdmi_phy_ops = {
 75	.init		= imx8mp_hdmi_phy_init,
 76	.disable	= imx8mp_hdmi_phy_disable,
 77	.setup_hpd	= im8mp_hdmi_phy_setup_hpd,
 78	.read_hpd	= dw_hdmi_phy_read_hpd,
 79	.update_hpd	= dw_hdmi_phy_update_hpd,
 80};
 81
 82static int imx8mp_dw_hdmi_probe(struct platform_device *pdev)
 83{
 84	struct device *dev = &pdev->dev;
 85	struct dw_hdmi_plat_data *plat_data;
 86	struct imx8mp_hdmi *hdmi;
 87
 88	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
 89	if (!hdmi)
 90		return -ENOMEM;
 91
 92	plat_data = &hdmi->plat_data;
 93
 94	hdmi->pixclk = devm_clk_get(dev, "pix");
 95	if (IS_ERR(hdmi->pixclk))
 96		return dev_err_probe(dev, PTR_ERR(hdmi->pixclk),
 97				     "Unable to get pixel clock\n");
 98
 99	plat_data->mode_valid = imx8mp_hdmi_mode_valid;
100	plat_data->phy_ops = &imx8mp_hdmi_phy_ops;
101	plat_data->phy_name = "SAMSUNG HDMI TX PHY";
102	plat_data->priv_data = hdmi;
103	plat_data->phy_force_vendor = true;
104
105	hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
106	if (IS_ERR(hdmi->dw_hdmi))
107		return PTR_ERR(hdmi->dw_hdmi);
108
109	platform_set_drvdata(pdev, hdmi);
110
111	return 0;
112}
113
114static void imx8mp_dw_hdmi_remove(struct platform_device *pdev)
115{
116	struct imx8mp_hdmi *hdmi = platform_get_drvdata(pdev);
117
118	dw_hdmi_remove(hdmi->dw_hdmi);
119}
120
121static int imx8mp_dw_hdmi_pm_suspend(struct device *dev)
122{
123	return 0;
124}
125
126static int imx8mp_dw_hdmi_pm_resume(struct device *dev)
127{
128	struct imx8mp_hdmi *hdmi = dev_get_drvdata(dev);
129
130	dw_hdmi_resume(hdmi->dw_hdmi);
131
132	return 0;
133}
134
135static const struct dev_pm_ops imx8mp_dw_hdmi_pm_ops = {
136	SYSTEM_SLEEP_PM_OPS(imx8mp_dw_hdmi_pm_suspend, imx8mp_dw_hdmi_pm_resume)
137};
138
139static const struct of_device_id imx8mp_dw_hdmi_of_table[] = {
140	{ .compatible = "fsl,imx8mp-hdmi-tx" },
141	{ /* Sentinel */ }
142};
143MODULE_DEVICE_TABLE(of, imx8mp_dw_hdmi_of_table);
144
145static struct platform_driver imx8mp_dw_hdmi_platform_driver = {
146	.probe		= imx8mp_dw_hdmi_probe,
147	.remove		= imx8mp_dw_hdmi_remove,
148	.driver		= {
149		.name	= "imx8mp-dw-hdmi-tx",
150		.of_match_table = imx8mp_dw_hdmi_of_table,
151		.pm = pm_ptr(&imx8mp_dw_hdmi_pm_ops),
152	},
153};
154
155module_platform_driver(imx8mp_dw_hdmi_platform_driver);
156
157MODULE_DESCRIPTION("i.MX8MP HDMI encoder driver");
158MODULE_LICENSE("GPL");