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

   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         .mode_valid = rcar_hdmi_mode_valid,
  79         .configure_phy  = rcar_hdmi_phy_configure,
  80 };
  81
  82 static 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
  95 static 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
 104 static const struct of_device_id rcar_dw_hdmi_of_table[] = {
 105         { .compatible = "renesas,rcar-gen3-hdmi" },
 106         { /* Sentinel */ },
 107 };
 108 MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);
 109
 110 static 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
 119 module_platform_driver(rcar_dw_hdmi_platform_driver);
 120
 121 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
 122 MODULE_DESCRIPTION("Renesas R-Car Gen3 HDMI Encoder Driver");
 123 MODULE_LICENSE("GPL");