drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c

   1 /*
   2  * R-Car Gen3 HDMI PHY
   3  *
   4  * Copyright (C) 2016 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16
  17 #include <drm/bridge/dw_hdmi.h>
  18
  19 #define RCAR_HDMI_PHY_OPMODE_PLLCFG     0x06    /* Mode of operation and PLL dividers */
  20 #define RCAR_HDMI_PHY_PLLCURRGMPCTRL    0x10    /* PLL current and Gmp (conductance) */
  21 #define RCAR_HDMI_PHY_PLLDIVCTRL        0x11    /* PLL dividers */
  22
  23 struct rcar_hdmi_phy_params {
  24         unsigned long mpixelclock;
  25         u16 opmode_div; /* Mode of operation and PLL dividers */
  26         u16 curr_gmp;   /* PLL current and Gmp (conductance) */
  27         u16 div;        /* PLL dividers */
  28 };
  29
  30 static const struct rcar_hdmi_phy_params rcar_hdmi_phy_params[] = {
  31         { 35500000,  0x0003, 0x0344, 0x0328 },
  32         { 44900000,  0x0003, 0x0285, 0x0128 },
  33         { 71000000,  0x0002, 0x1184, 0x0314 },
  34         { 90000000,  0x0002, 0x1144, 0x0114 },
  35         { 140250000, 0x0001, 0x20c4, 0x030a },
  36         { 182750000, 0x0001, 0x2084, 0x010a },
  37         { 281250000, 0x0000, 0x0084, 0x0305 },
  38         { 297000000, 0x0000, 0x0084, 0x0105 },
  39         { ~0UL,      0x0000, 0x0000, 0x0000 },
  40 };
  41
  42 static int rcar_hdmi_phy_configure(struct dw_hdmi *hdmi,
  43                                    const struct dw_hdmi_plat_data *pdata,
  44                                    unsigned long mpixelclock)
  45 {
  46         const struct rcar_hdmi_phy_params *params = rcar_hdmi_phy_params;
  47
  48         for (; params->mpixelclock != ~0UL; ++params) {
  49                 if (mpixelclock <= params->mpixelclock)
  50                         break;
  51         }
  52
  53         if (params->mpixelclock == ~0UL)
  54                 return -EINVAL;
  55
  56         dw_hdmi_phy_i2c_write(hdmi, params->opmode_div,
  57                               RCAR_HDMI_PHY_OPMODE_PLLCFG);
  58         dw_hdmi_phy_i2c_write(hdmi, params->curr_gmp,
  59                               RCAR_HDMI_PHY_PLLCURRGMPCTRL);
  60         dw_hdmi_phy_i2c_write(hdmi, params->div, RCAR_HDMI_PHY_PLLDIVCTRL);
  61
  62         return 0;
  63 }
  64
  65 static const struct dw_hdmi_plat_data rcar_dw_hdmi_plat_data = {
  66         .configure_phy  = rcar_hdmi_phy_configure,
  67 };
  68
  69 static int rcar_dw_hdmi_probe(struct platform_device *pdev)
  70 {
  71         struct dw_hdmi *hdmi;
  72
  73         hdmi = dw_hdmi_probe(pdev, &rcar_dw_hdmi_plat_data);
  74         if (IS_ERR(hdmi))
  75                 return PTR_ERR(hdmi);
  76
  77         platform_set_drvdata(pdev, hdmi);
  78
  79         return 0;
  80 }
  81
  82 static int rcar_dw_hdmi_remove(struct platform_device *pdev)
  83 {
  84         struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
  85
  86         dw_hdmi_remove(hdmi);
  87
  88         return 0;
  89 }
  90
  91 static const struct of_device_id rcar_dw_hdmi_of_table[] = {
  92         { .compatible = "renesas,rcar-gen3-hdmi" },
  93         { /* Sentinel */ },
  94 };
  95 MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
  96
  97 static struct platform_driver rcar_dw_hdmi_platform_driver = {
  98         .probe          = rcar_dw_hdmi_probe,
  99         .remove         = rcar_dw_hdmi_remove,
 100         .driver         = {
 101                 .name   = "rcar-dw-hdmi",
 102                 .of_match_table = rcar_dw_hdmi_of_table,
 103         },
 104 };
 105
 106 module_platform_driver(rcar_dw_hdmi_platform_driver);
 107
 108 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 109 MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
 110 MODULE_LICENSE("GPL");