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
imx8mp_hdmi_mode_valid(struct dw_hdmi * dw_hdmi,void * data,const struct drm_display_info * info,const struct drm_display_mode * mode)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
imx8mp_hdmi_phy_init(struct dw_hdmi * dw_hdmi,void * data,const struct drm_display_info * display,const struct drm_display_mode * mode)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
imx8mp_hdmi_phy_disable(struct dw_hdmi * dw_hdmi,void * data)52 static void imx8mp_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
53 {
54 }
55
im8mp_hdmi_phy_setup_hpd(struct dw_hdmi * hdmi,void * data)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
imx8mp_dw_hdmi_probe(struct platform_device * pdev)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
imx8mp_dw_hdmi_remove(struct platform_device * pdev)107 static void 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
imx8mp_dw_hdmi_pm_suspend(struct device * dev)114 static int __maybe_unused imx8mp_dw_hdmi_pm_suspend(struct device *dev)
115 {
116 return 0;
117 }
118
imx8mp_dw_hdmi_pm_resume(struct device * dev)119 static int __maybe_unused imx8mp_dw_hdmi_pm_resume(struct device *dev)
120 {
121 struct imx8mp_hdmi *hdmi = dev_get_drvdata(dev);
122
123 dw_hdmi_resume(hdmi->dw_hdmi);
124
125 return 0;
126 }
127
128 static const struct dev_pm_ops imx8mp_dw_hdmi_pm_ops = {
129 SET_SYSTEM_SLEEP_PM_OPS(imx8mp_dw_hdmi_pm_suspend,
130 imx8mp_dw_hdmi_pm_resume)
131 };
132
133 static const struct of_device_id imx8mp_dw_hdmi_of_table[] = {
134 { .compatible = "fsl,imx8mp-hdmi-tx" },
135 { /* Sentinel */ }
136 };
137 MODULE_DEVICE_TABLE(of, imx8mp_dw_hdmi_of_table);
138
139 static struct platform_driver imx8mp_dw_hdmi_platform_driver = {
140 .probe = imx8mp_dw_hdmi_probe,
141 .remove_new = imx8mp_dw_hdmi_remove,
142 .driver = {
143 .name = "imx8mp-dw-hdmi-tx",
144 .of_match_table = imx8mp_dw_hdmi_of_table,
145 .pm = &imx8mp_dw_hdmi_pm_ops,
146 },
147 };
148
149 module_platform_driver(imx8mp_dw_hdmi_platform_driver);
150
151 MODULE_DESCRIPTION("i.MX8MP HDMI encoder driver");
152 MODULE_LICENSE("GPL");
153