0008-drm-imx-add-bridge-wrapper-driver-for-i.MX8MP-DWC-HD.patch

From 854ae91ceec110b553302ba5954996e0ca3996a3 Mon Sep 17 00:00:00 2001
From: Lucas Stach <l.stach@pengutronix.de>
Date: Fri, 1 Apr 2022 22:11:44 +0200
Subject: [PATCH 08/11] drm/imx: add bridge wrapper driver for i.MX8MP DWC HDMI

Add a simple wrapper driver for the DWC HDMI bridge driver that
implements the few bits that are necessary to abstract the i.MX8MP
SoC integration.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Tested-by: Marek Vasut <marex@denx.de>
---
 drivers/gpu/drm/bridge/imx/Kconfig       |   9 ++
 drivers/gpu/drm/bridge/imx/imx8mp-hdmi.c | 141 +++++++++++++++++++++++
 2 files changed, 150 insertions(+)
 create mode 100644 drivers/gpu/drm/bridge/imx/imx8mp-hdmi.c

--- a/drivers/gpu/drm/bridge/imx/Kconfig
+++ b/drivers/gpu/drm/bridge/imx/Kconfig
@@ -67,4 +67,13 @@ config DRM_IMX8MP_HDMI_PVI
 	  Choose this to enable support for the internal HDMI TX Parallel
 	  Video Interface found on the i.MX8MP SoC.
 
+config DRM_IMX8MP_DW_HDMI_BRIDGE
+	tristate "i.MX8MP HDMI bridge support"
+	depends on OF
+	depends on COMMON_CLK
+	select DRM_DW_HDMI
+	help
+	  Choose this to enable support for the internal HDMI encoder found
+	  on the i.MX8MP SoC.
+
 endif # ARCH_MXC || COMPILE_TEST
--- /dev/null
+++ b/drivers/gpu/drm/bridge/imx/imx8mp-hdmi.c
@@ -0,0 +1,141 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright (C) 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
+ */
+
+#include <drm/bridge/dw_hdmi.h>
+#include <drm/drm_modes.h>
+#include <linux/clk.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+struct imx_hdmi {
+	struct dw_hdmi_plat_data plat_data;
+	struct dw_hdmi *dw_hdmi;
+	struct clk *pixclk;
+	struct clk *fdcc;
+};
+
+static enum drm_mode_status
+imx8mp_hdmi_mode_valid(struct dw_hdmi *dw_hdmi, void *data,
+		       const struct drm_display_info *info,
+		       const struct drm_display_mode *mode)
+{
+	struct imx_hdmi *hdmi = (struct imx_hdmi *)data;
+
+	if (mode->clock < 13500)
+		return MODE_CLOCK_LOW;
+
+	if (mode->clock > 297000)
+		return MODE_CLOCK_HIGH;
+
+	if (clk_round_rate(hdmi->pixclk, mode->clock * 1000) !=
+	    mode->clock * 1000)
+		return MODE_CLOCK_RANGE;
+
+	/* We don't support double-clocked and Interlaced modes */
+	if ((mode->flags & DRM_MODE_FLAG_DBLCLK) ||
+	    (mode->flags & DRM_MODE_FLAG_INTERLACE))
+		return MODE_BAD;
+
+	return MODE_OK;
+}
+
+static int imx8mp_hdmi_phy_init(struct dw_hdmi *dw_hdmi, void *data,
+				const struct drm_display_info *display,
+				const struct drm_display_mode *mode)
+{
+	return 0;
+}
+
+static void imx8mp_hdmi_phy_disable(struct dw_hdmi *dw_hdmi, void *data)
+{
+}
+
+static const struct dw_hdmi_phy_ops imx8mp_hdmi_phy_ops = {
+	.init		= imx8mp_hdmi_phy_init,
+	.disable	= imx8mp_hdmi_phy_disable,
+	.read_hpd	= dw_hdmi_phy_read_hpd,
+	.update_hpd	= dw_hdmi_phy_update_hpd,
+	.setup_hpd	= dw_hdmi_phy_setup_hpd,
+};
+
+static int imx_dw_hdmi_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct dw_hdmi_plat_data *plat_data;
+	struct imx_hdmi *hdmi;
+	int ret;
+
+	hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL);
+	if (!hdmi)
+		return -ENOMEM;
+
+	plat_data = &hdmi->plat_data;
+
+	hdmi->pixclk = devm_clk_get(dev, "pix");
+	if (IS_ERR(hdmi->pixclk))
+		return dev_err_probe(dev, PTR_ERR(hdmi->pixclk),
+				     "Unable to get pixel clock\n");
+
+	hdmi->fdcc = devm_clk_get(dev, "fdcc");
+	if (IS_ERR(hdmi->fdcc))
+		return dev_err_probe(dev, PTR_ERR(hdmi->fdcc),
+				     "Unable to get FDCC clock\n");
+
+	ret = clk_prepare_enable(hdmi->fdcc);
+	if (ret)
+		return dev_err_probe(dev, ret, "Unable to enable FDCC clock\n");
+
+	plat_data->mode_valid = imx8mp_hdmi_mode_valid;
+	plat_data->phy_ops = &imx8mp_hdmi_phy_ops;
+	plat_data->phy_name = "SAMSUNG HDMI TX PHY";
+	plat_data->priv_data = hdmi;
+
+	hdmi->dw_hdmi = dw_hdmi_probe(pdev, plat_data);
+	if (IS_ERR(hdmi->dw_hdmi))
+		return PTR_ERR(hdmi->dw_hdmi);
+
+	/*
+	 * Just release PHY core from reset, all other power management is done
+	 * by the PHY driver.
+	 */
+	dw_hdmi_phy_gen1_reset(hdmi->dw_hdmi);
+
+	platform_set_drvdata(pdev, hdmi);
+
+	return 0;
+}
+
+static int imx_dw_hdmi_remove(struct platform_device *pdev)
+{
+	struct imx_hdmi *hdmi = platform_get_drvdata(pdev);
+
+	dw_hdmi_remove(hdmi->dw_hdmi);
+
+	clk_disable_unprepare(hdmi->fdcc);
+
+	return 0;
+}
+
+static const struct of_device_id imx_dw_hdmi_of_table[] = {
+	{ .compatible = "fsl,imx8mp-hdmi" },
+	{ /* Sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, imx_dw_hdmi_of_table);
+
+static struct platform_driver im_dw_hdmi_platform_driver = {
+	.probe		= imx_dw_hdmi_probe,
+	.remove		= imx_dw_hdmi_remove,
+	.driver		= {
+		.name	= "imx-dw-hdmi",
+		.of_match_table = imx_dw_hdmi_of_table,
+	},
+};
+
+module_platform_driver(im_dw_hdmi_platform_driver);
+
+MODULE_DESCRIPTION("i.MX8M HDMI encoder driver");
+MODULE_LICENSE("GPL");