[PATCH v0 03/10] drm/imx: add bridge wrapper driver for i.MX8MP DWC HDMI

[Lucas Stach <l.stach@pengutronix.de>]

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>
---
 drivers/gpu/drm/imx/Kconfig           |   1 +
 drivers/gpu/drm/imx/Makefile          |   2 +
 drivers/gpu/drm/imx/bridge/Kconfig    |  10 ++
 drivers/gpu/drm/imx/bridge/Makefile   |   3 +
 drivers/gpu/drm/imx/bridge/imx-hdmi.c | 128 ++++++++++++++++++++++++++
 5 files changed, 144 insertions(+)
 create mode 100644 drivers/gpu/drm/imx/bridge/Kconfig
 create mode 100644 drivers/gpu/drm/imx/bridge/Makefile
 create mode 100644 drivers/gpu/drm/imx/bridge/imx-hdmi.c

diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
index bb9738c7c825..88b054c095c6 100644
--- a/drivers/gpu/drm/imx/Kconfig
+++ b/drivers/gpu/drm/imx/Kconfig
@@ -42,3 +42,4 @@ config DRM_IMX_HDMI
 	  Choose this if you want to use HDMI on i.MX6.
 
 source "drivers/gpu/drm/imx/dcss/Kconfig"
+source "drivers/gpu/drm/imx/bridge/Kconfig"
diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile
index b644deffe948..861403d11af6 100644
--- a/drivers/gpu/drm/imx/Makefile
+++ b/drivers/gpu/drm/imx/Makefile
@@ -10,3 +10,5 @@ obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
 
 obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
 obj-$(CONFIG_DRM_IMX_DCSS) += dcss/
+
+obj-y += bridge/
diff --git a/drivers/gpu/drm/imx/bridge/Kconfig b/drivers/gpu/drm/imx/bridge/Kconfig
new file mode 100644
index 000000000000..8b02dc5606ba
--- /dev/null
+++ b/drivers/gpu/drm/imx/bridge/Kconfig
@@ -0,0 +1,10 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config DRM_IMX_DW_HDMI_BRIDGE
+	tristate "HDMI encoder support"
+	depends on (ARCH_MXC && ARM64) || COMPILE_TEST
+	depends on DRM && OF
+	select DRM_DW_HDMI
+	help
+	  Enable support for the internal HDMI encoder on i.MX8MP SoC
+
diff --git a/drivers/gpu/drm/imx/bridge/Makefile b/drivers/gpu/drm/imx/bridge/Makefile
new file mode 100644
index 000000000000..1cfe9623c0d8
--- /dev/null
+++ b/drivers/gpu/drm/imx/bridge/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_DRM_IMX_DW_HDMI_BRIDGE)	+= imx-hdmi.o
diff --git a/drivers/gpu/drm/imx/bridge/imx-hdmi.c b/drivers/gpu/drm/imx/bridge/imx-hdmi.c
new file mode 100644
index 000000000000..2e72f83be108
--- /dev/null
+++ b/drivers/gpu/drm/imx/bridge/imx-hdmi.c
@@ -0,0 +1,128 @@
+// 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;
+};
+
+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)
+{
+	/*
+	 * Just release PHY core from reset, all other power management is done
+	 * by the PHY driver.
+	 */
+	dw_hdmi_phy_reset_active_low(dw_hdmi);
+
+	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;
+
+	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");
+
+	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);
+
+	platform_set_drvdata(pdev, hdmi);
+
+	return 0;
+}
+
+static int imx_dw_hdmi_remove(struct platform_device *pdev)
+{
+	struct dw_hdmi *hdmi = platform_get_drvdata(pdev);
+
+	dw_hdmi_remove(hdmi);
+
+	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");
-- 
2.30.2