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    Subject[PATCH v9 4/8] drm/ingenic: Add dw-hdmi driver for jz4780
    Date
    From: Paul Boddie <paul@boddie.org.uk>

    A specialisation of the generic Synopsys HDMI driver is employed for
    JZ4780 HDMI support. This requires a new driver, plus device tree and
    configuration modifications.

    Here we add Kconfig DRM_INGENIC_DW_HDMI, Makefile and driver code.

    Signed-off-by: Paul Boddie <paul@boddie.org.uk>
    Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
    Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
    ---
    drivers/gpu/drm/ingenic/Kconfig | 9 ++
    drivers/gpu/drm/ingenic/Makefile | 1 +
    drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c | 138 ++++++++++++++++++++++
    3 files changed, 148 insertions(+)
    create mode 100644 drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c

    diff --git a/drivers/gpu/drm/ingenic/Kconfig b/drivers/gpu/drm/ingenic/Kconfig
    index 3b57f8be007c4..4efc709d77b0a 100644
    --- a/drivers/gpu/drm/ingenic/Kconfig
    +++ b/drivers/gpu/drm/ingenic/Kconfig
    @@ -25,4 +25,13 @@ config DRM_INGENIC_IPU

    The Image Processing Unit (IPU) will appear as a second primary plane.

    +config DRM_INGENIC_DW_HDMI
    + tristate "Ingenic specific support for Synopsys DW HDMI"
    + depends on MACH_JZ4780
    + select DRM_DW_HDMI
    + help
    + Choose this option to enable Synopsys DesignWare HDMI based driver.
    + If you want to enable HDMI on Ingenic JZ4780 based SoC, you should
    + select this option..
    +
    endif
    diff --git a/drivers/gpu/drm/ingenic/Makefile b/drivers/gpu/drm/ingenic/Makefile
    index d313326bdddbb..f10cc1c5a5f22 100644
    --- a/drivers/gpu/drm/ingenic/Makefile
    +++ b/drivers/gpu/drm/ingenic/Makefile
    @@ -1,3 +1,4 @@
    obj-$(CONFIG_DRM_INGENIC) += ingenic-drm.o
    ingenic-drm-y = ingenic-drm-drv.o
    ingenic-drm-$(CONFIG_DRM_INGENIC_IPU) += ingenic-ipu.o
    +obj-$(CONFIG_DRM_INGENIC_DW_HDMI) += ingenic-dw-hdmi.o
    diff --git a/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
    new file mode 100644
    index 0000000000000..199e39c227d29
    --- /dev/null
    +++ b/drivers/gpu/drm/ingenic/ingenic-dw-hdmi.c
    @@ -0,0 +1,138 @@
    +// SPDX-License-Identifier: GPL-2.0
    +/* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
    + * Copyright (C) 2019, 2020 Paul Boddie <paul@boddie.org.uk>
    + *
    + * Derived from dw_hdmi-imx.c with i.MX portions removed.
    + * Probe and remove operations derived from rcar_dw_hdmi.c.
    + */
    +
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/regmap.h>
    +
    +#include <drm/bridge/dw_hdmi.h>
    +#include <drm/drm_of.h>
    +#include <drm/drm_print.h>
    +
    +static const struct dw_hdmi_mpll_config ingenic_mpll_cfg[] = {
    + { 45250000, { { 0x01e0, 0x0000 }, { 0x21e1, 0x0000 }, { 0x41e2, 0x0000 } } },
    + { 92500000, { { 0x0140, 0x0005 }, { 0x2141, 0x0005 }, { 0x4142, 0x0005 } } },
    + { 148500000, { { 0x00a0, 0x000a }, { 0x20a1, 0x000a }, { 0x40a2, 0x000a } } },
    + { 216000000, { { 0x00a0, 0x000a }, { 0x2001, 0x000f }, { 0x4002, 0x000f } } },
    + { ~0UL, { { 0x0000, 0x0000 }, { 0x0000, 0x0000 }, { 0x0000, 0x0000 } } }
    +};
    +
    +static const struct dw_hdmi_curr_ctrl ingenic_cur_ctr[] = {
    + /*pixelclk bpp8 bpp10 bpp12 */
    + { 54000000, { 0x091c, 0x091c, 0x06dc } },
    + { 58400000, { 0x091c, 0x06dc, 0x06dc } },
    + { 72000000, { 0x06dc, 0x06dc, 0x091c } },
    + { 74250000, { 0x06dc, 0x0b5c, 0x091c } },
    + { 118800000, { 0x091c, 0x091c, 0x06dc } },
    + { 216000000, { 0x06dc, 0x0b5c, 0x091c } },
    + { ~0UL, { 0x0000, 0x0000, 0x0000 } },
    +};
    +
    +/*
    + * Resistance term 133Ohm Cfg
    + * PREEMP config 0.00
    + * TX/CK level 10
    + */
    +static const struct dw_hdmi_phy_config ingenic_phy_config[] = {
    + /*pixelclk symbol term vlev */
    + { 216000000, 0x800d, 0x0005, 0x01ad},
    + { ~0UL, 0x0000, 0x0000, 0x0000}
    +};
    +
    +static enum drm_mode_status
    +ingenic_dw_hdmi_mode_valid(struct dw_hdmi *hdmi, void *data,
    + const struct drm_display_info *info,
    + const struct drm_display_mode *mode)
    +{
    + if (mode->clock < 13500)
    + return MODE_CLOCK_LOW;
    + /* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
    + if (mode->clock > 216000)
    + return MODE_CLOCK_HIGH;
    +
    + return MODE_OK;
    +}
    +
    +static struct dw_hdmi_plat_data ingenic_dw_hdmi_plat_data = {
    + .mpll_cfg = ingenic_mpll_cfg,
    + .cur_ctr = ingenic_cur_ctr,
    + .phy_config = ingenic_phy_config,
    + .mode_valid = ingenic_dw_hdmi_mode_valid,
    + .output_port = 1,
    +};
    +
    +static const struct of_device_id ingenic_dw_hdmi_dt_ids[] = {
    + { .compatible = "ingenic,jz4780-dw-hdmi" },
    + { /* Sentinel */ },
    +};
    +MODULE_DEVICE_TABLE(of, ingenic_dw_hdmi_dt_ids);
    +
    +static void ingenic_dw_hdmi_cleanup(void *data)
    +{
    + struct dw_hdmi *hdmi = (struct dw_hdmi *)data;
    +
    + dw_hdmi_remove(hdmi);
    +}
    +
    +static void ingenic_dw_hdmi_disable_regulator(void *data)
    +{
    + struct regulator *regulator = (struct regulator *)data;
    +
    + regulator_disable(regulator);
    +}
    +
    +static int ingenic_dw_hdmi_probe(struct platform_device *pdev)
    +{
    + struct dw_hdmi *hdmi;
    + struct regulator *regulator;
    + int ret;
    +
    + hdmi = dw_hdmi_probe(pdev, &ingenic_dw_hdmi_plat_data);
    + if (IS_ERR(hdmi))
    + return PTR_ERR(hdmi);
    +
    + ret = devm_add_action_or_reset(&pdev->dev, ingenic_dw_hdmi_cleanup, hdmi);
    + if (ret)
    + return ret;
    +
    + regulator = devm_regulator_get_optional(&pdev->dev, "hdmi-5v");
    + if (IS_ERR(regulator)) {
    + ret = PTR_ERR(regulator);
    +
    + DRM_DEV_ERROR(&pdev->dev, "failed to get hpd regulator: %s (%d)\n",
    + "hdmi-5v", ret);
    +
    + return ret;
    + }
    +
    + if (!regulator)
    + return 0;
    + ret = regulator_enable(regulator);
    + if (ret) {
    + DRM_DEV_ERROR(&pdev->dev, "Failed to enable hpd regulator: %d\n",
    + ret);
    +
    + return ret;
    + }
    +
    + return devm_add_action_or_reset(&pdev->dev, ingenic_dw_hdmi_disable_regulator,
    + regulator);
    +}
    +
    +static struct platform_driver ingenic_dw_hdmi_driver = {
    + .probe = ingenic_dw_hdmi_probe,
    + .driver = {
    + .name = "dw-hdmi-ingenic",
    + .of_match_table = ingenic_dw_hdmi_dt_ids,
    + },
    +};
    +module_platform_driver(ingenic_dw_hdmi_driver);
    +
    +MODULE_DESCRIPTION("JZ4780 Specific DW-HDMI Driver Extension");
    +MODULE_LICENSE("GPL v2");
    +MODULE_ALIAS("platform:dwhdmi-ingenic");
    --
    2.33.0
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