LXR linux/drivers/gpu/drm/rcar-du/rcar_dw

   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 int 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        return 0;
 103}
 104
 105static const struct of_device_id rcar_dw_hdmi_of_table[] = {
 106        { .compatible = "renesas,rcar-gen3-hdmi" },
 107        { /* Sentinel */ },
 108};
 109MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
 110
 111static struct platform_driver rcar_dw_hdmi_platform_driver = {
 112        .probe          = rcar_dw_hdmi_probe,
 113        .remove         = rcar_dw_hdmi_remove,
 114        .driver         = {
 115                .name   = "rcar-dw-hdmi",
 116                .of_match_table = rcar_dw_hdmi_of_table,
 117        },
 118};
 119
 120module_platform_driver(rcar_dw_hdmi_platform_driver);
 121
 122MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 123MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
 124MODULE_LICENSE("GPL");
 125