drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
   3  * Copyright (C) 2019, 2020 Paul Boddie <paul@boddie.org.uk>
   4  *
   5  * Derived from dw_hdmi-imx.c with i.MX portions removed.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/of_platform.h>
  10 #include <linux/platform_device.h>
  11
  12 #include <drm/bridge/dw_hdmi.h>
  13 #include <drm/drm_of.h>
  14 #include <drm/drm_print.h>
  15
  16 static const struct dw_hdmi_mpll_config ingenic_mpll_cfg[] = {
  17         { 45250000,  { { 0x01e0, 0x0000 }, { 0x21e1, 0x0000 }, { 0x41e2, 0x0000 } } },
  18         { 92500000,  { { 0x0140, 0x0005 }, { 0x2141, 0x0005 }, { 0x4142, 0x0005 } } },
  19         { 148500000, { { 0x00a0, 0x000a }, { 0x20a1, 0x000a }, { 0x40a2, 0x000a } } },
  20         { 216000000, { { 0x00a0, 0x000a }, { 0x2001, 0x000f }, { 0x4002, 0x000f } } },
  21         { ~0UL,      { { 0x0000, 0x0000 }, { 0x0000, 0x0000 }, { 0x0000, 0x0000 } } }
  22 };
  23
  24 static const struct dw_hdmi_curr_ctrl ingenic_cur_ctr[] = {
  25         /*pixelclk     bpp8    bpp10   bpp12 */
  26         { 54000000,  { 0x091c, 0x091c, 0x06dc } },
  27         { 58400000,  { 0x091c, 0x06dc, 0x06dc } },
  28         { 72000000,  { 0x06dc, 0x06dc, 0x091c } },
  29         { 74250000,  { 0x06dc, 0x0b5c, 0x091c } },
  30         { 118800000, { 0x091c, 0x091c, 0x06dc } },
  31         { 216000000, { 0x06dc, 0x0b5c, 0x091c } },
  32         { ~0UL,      { 0x0000, 0x0000, 0x0000 } },
  33 };
  34
  35 /*
  36  * Resistance term 133Ohm Cfg
  37  * PREEMP config 0.00
  38  * TX/CK level 10
  39  */
  40 static const struct dw_hdmi_phy_config ingenic_phy_config[] = {
  41         /*pixelclk   symbol   term   vlev */
  42         { 216000000, 0x800d, 0x0005, 0x01ad},
  43         { ~0UL,      0x0000, 0x0000, 0x0000}
  44 };
  45
  46 static enum drm_mode_status
  47 ingenic_dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
  48                            const struct drm_display_info *info,
  49                            const struct drm_display_mode *mode)
  50 {
  51         if (mode->clock < 13500)
  52                 return MODE_CLOCK_LOW;
  53         /* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
  54         if (mode->clock > 216000)
  55                 return MODE_CLOCK_HIGH;
  56
  57         return MODE_OK;
  58 }
  59
  60 static struct dw_hdmi_plat_data ingenic_dw_hdmi_plat_data = {
  61         .mpll_cfg   = ingenic_mpll_cfg,
  62         .cur_ctr    = ingenic_cur_ctr,
  63         .phy_config = ingenic_phy_config,
  64         .mode_valid = ingenic_dw_hdmi_mode_valid,
  65         .output_port    = 1,
  66 };
  67
  68 static const struct of_device_id ingenic_dw_hdmi_dt_ids[] = {
  69         { .compatible = "ingenic,jz4780-dw-hdmi" },
  70         { /* Sentinel */ },
  71 };
  72 MODULE_DEVICE_TABLE(of, ingenic_dw_hdmi_dt_ids);
  73
  74 static void ingenic_dw_hdmi_cleanup(void *data)
  75 {
  76         struct dw_hdmi *hdmi = (struct dw_hdmi *)data;
  77
  78         dw_hdmi_remove(hdmi);
  79 }
  80
  81 static int ingenic_dw_hdmi_probe(struct platform_device *pdev)
  82 {
  83         struct dw_hdmi *hdmi;
  84
  85         hdmi = dw_hdmi_probe(pdev, &ingenic_dw_hdmi_plat_data);
  86         if (IS_ERR(hdmi))
  87                 return PTR_ERR(hdmi);
  88
  89         return devm_add_action_or_reset(&pdev->dev, ingenic_dw_hdmi_cleanup, hdmi);
  90 }
  91
  92 static struct platform_driver ingenic_dw_hdmi_driver = {
  93         .probe  = ingenic_dw_hdmi_probe,
  94         .driver = {
  95                 .name = "dw-hdmi-ingenic",
  96                 .of_match_table = ingenic_dw_hdmi_dt_ids,
  97         },
  98 };
  99 module_platform_driver(ingenic_dw_hdmi_driver);
 100
 101 MODULE_DESCRIPTION("JZ4780 Specific DW-HDMI Driver Extension");
 102 MODULE_LICENSE("GPL v2");
 103 MODULE_ALIAS("platform:dw-hdmi-ingenic");