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	.mode_valid = rcar_hdmi_mode_valid,
 79	.configure_phy	= rcar_hdmi_phy_configure,
 80};
 81
 82static int rcar_dw_hdmi_probe(struct platform_device *pdev)
 83{
 84	struct dw_hdmi *hdmi;
 85
 86	hdmi = dw_hdmi_probe(pdev, &rcar_dw_hdmi_plat_data);
 87	if (IS_ERR(hdmi))
 88		return PTR_ERR(hdmi);
 89
 90	platform_set_drvdata(pdev, hdmi);
 91
 92	return 0;
 93}
 94
 95static int rcar_dw_hdmi_remove(struct platform_device *pdev)
 96{
 97	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
 98
 99	dw_hdmi_remove(hdmi);
100
101	return 0;
102}
103
104static const struct of_device_id rcar_dw_hdmi_of_table[] = {
105	{ .compatible = "renesas,rcar-gen3-hdmi" },
106	{ /* Sentinel */ },
107};
108MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
109
110static struct platform_driver rcar_dw_hdmi_platform_driver = {
111	.probe		= rcar_dw_hdmi_probe,
112	.remove		= rcar_dw_hdmi_remove,
113	.driver		= {
114		.name	= "rcar-dw-hdmi",
115		.of_match_table = rcar_dw_hdmi_of_table,
116	},
117};
118
119module_platform_driver(rcar_dw_hdmi_platform_driver);
120
121MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
122MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
123MODULE_LICENSE("GPL");