1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * R-Car Gen3 HDMI PHY
4  *
5  * Copyright (C) 2016 Renesas Electronics Corporation
6  *
7  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
8  */
9 
10 #include <linux/mod_devicetable.h>
11 #include <linux/module.h>
12 #include <linux/platform_device.h>
13 
14 #include <drm/bridge/dw_hdmi.h>
15 #include <drm/drm_modes.h>
16 
17 #define RCAR_HDMI_PHY_OPMODE_PLLCFG	0x06	/* Mode of operation and PLL dividers */
18 #define RCAR_HDMI_PHY_PLLCURRGMPCTRL	0x10	/* PLL current and Gmp (conductance) */
19 #define RCAR_HDMI_PHY_PLLDIVCTRL	0x11	/* PLL dividers */
20 
21 struct rcar_hdmi_phy_params {
22 	unsigned long mpixelclock;
23 	u16 opmode_div;	/* Mode of operation and PLL dividers */
24 	u16 curr_gmp;	/* PLL current and Gmp (conductance) */
25 	u16 div;	/* PLL dividers */
26 };
27 
28 static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = {
29 	{ 35500000,  0x0003, 0x0344, 0x0328 },
30 	{ 44900000,  0x0003, 0x0285, 0x0128 },
31 	{ 71000000,  0x0002, 0x1184, 0x0314 },
32 	{ 90000000,  0x0002, 0x1144, 0x0114 },
33 	{ 140250000, 0x0001, 0x20c4, 0x030a },
34 	{ 182750000, 0x0001, 0x2084, 0x010a },
35 	{ 281250000, 0x0000, 0x0084, 0x0305 },
36 	{ 297000000, 0x0000, 0x0084, 0x0105 },
37 	{ ~0UL,      0x0000, 0x0000, 0x0000 },
38 };
39 
40 static enum drm_mode_status
41 rcar_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
42 		     const struct drm_display_info *info,
43 		     const struct drm_display_mode *mode)
44 {
45 	/*
46 	 * The maximum supported clock frequency is 297 MHz, as shown in the PHY
47 	 * parameters table.
48 	 */
49 	if (mode->clock > 297000)
50 		return MODE_CLOCK_HIGH;
51 
52 	return MODE_OK;
53 }
54 
55 static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi, void *data,
56 				   unsigned long mpixelclock)
57 {
58 	const struct rcar_hdmi_phy_params *params = rcar_hdmi_phy_params;
59 
60 	for (; params->mpixelclock != ~0UL; ++params) {
61 		if (mpixelclock <= params->mpixelclock)
62 			break;
63 	}
64 
65 	if (params->mpixelclock == ~0UL)
66 		return -EINVAL;
67 
68 	dw_hdmi_phy_i2c_write(hdmi, params->opmode_div,
69 			      RCAR_HDMI_PHY_OPMODE_PLLCFG);
70 	dw_hdmi_phy_i2c_write(hdmi, params->curr_gmp,
71 			      RCAR_HDMI_PHY_PLLCURRGMPCTRL);
72 	dw_hdmi_phy_i2c_write(hdmi, params->div, RCAR_HDMI_PHY_PLLDIVCTRL);
73 
74 	return 0;
75 }
76 
77 static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = {
78 	.output_port = 1,
79 	.mode_valid = rcar_hdmi_mode_valid,
80 	.configure_phy	= rcar_hdmi_phy_configure,
81 };
82 
83 static int rcar_dw_hdmi_probe(struct platform_device *pdev)
84 {
85 	struct dw_hdmi *hdmi;
86 
87 	hdmi = dw_hdmi_probe(pdev, &rcar_dw_hdmi_plat_data);
88 	if (IS_ERR(hdmi))
89 		return PTR_ERR(hdmi);
90 
91 	platform_set_drvdata(pdev, hdmi);
92 
93 	return 0;
94 }
95 
96 static void rcar_dw_hdmi_remove(struct platform_device *pdev)
97 {
98 	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
99 
100 	dw_hdmi_remove(hdmi);
101 }
102 
103 static const struct of_device_id rcar_dw_hdmi_of_table[] = {
104 	{ .compatible = "renesas,rcar-gen3-hdmi" },
105 	{ /* Sentinel */ },
106 };
107 MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
108 
109 static struct platform_driver rcar_dw_hdmi_platform_driver = {
110 	.probe		= rcar_dw_hdmi_probe,
111 	.remove_new	= rcar_dw_hdmi_remove,
112 	.driver		= {
113 		.name	= "rcar-dw-hdmi",
114 		.of_match_table = rcar_dw_hdmi_of_table,
115 	},
116 };
117 
118 module_platform_driver(rcar_dw_hdmi_platform_driver);
119 
120 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
121 MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
122 MODULE_LICENSE("GPL");
123