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 
14 struct imx8mp_hdmi {
15 	struct dw_hdmi_plat_data plat_data;
16 	struct dw_hdmi *dw_hdmi;
17 	struct clk *pixclk;
18 };
19 
20 static enum drm_mode_status
21 imx8mp_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 
45 static 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 
52 static void imx8mp_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
53 {
54 }
55 
56 static 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 
67 static 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 
75 static 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 
107 static 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 
116 static int __maybe_unused imx8mp_dw_hdmi_pm_suspend(struct device *dev)
117 {
118 	return 0;
119 }
120 
121 static 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 
130 static 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 
135 static const struct of_device_id imx8mp_dw_hdmi_of_table[] = {
136 	{ .compatible = "fsl,imx8mp-hdmi-tx" },
137 	{ /* Sentinel */ }
138 };
139 MODULE_DEVICE_TABLE(of, imx8mp_dw_hdmi_of_table);
140 
141 static 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 
151 module_platform_driver(imx8mp_dw_hdmi_platform_driver);
152 
153 MODULE_DESCRIPTION("i.MX8MP HDMI encoder driver");
154 MODULE_LICENSE("GPL");
155