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
21struct 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
28static 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
40static enum drm_mode_status
41rcar_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
55static 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
77static 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
83static 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
96static 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
103static const struct of_device_id rcar_dw_hdmi_of_table[] = {
104	{ .compatible = "renesas,rcar-gen3-hdmi" },
105	{ /* Sentinel */ },
106};
107MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
108
109static 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
118module_platform_driver(rcar_dw_hdmi_platform_driver);
119
120MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
121MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
122MODULE_LICENSE("GPL");
123