[v0.5,4/9] drm/imx: add driver for HDMI TX Parallel Video Interface

diff --git a/drivers/gpu/drm/imx/bridge/Kconfig b/drivers/gpu/drm/imx/bridge/Kconfig
index d63a09ca63dd..1f74f73c790e 100644
--- a/drivers/gpu/drm/imx/bridge/Kconfig
+++ b/drivers/gpu/drm/imx/bridge/Kconfig
@@ -8,3 +8,11 @@  config DRM_IMX_DW_HDMI_BRIDGE
 	help
 	  Enable support for the internal HDMI encoder on i.MX8MP SoC
 
+config DRM_IMX_HDMI_PVI
+	tristate "i.MX8MP HDMI PVI bridge support"
+	depends on (ARCH_MXC && ARM64) || COMPILE_TEST
+	depends on DRM && OF
+	help
+	  Enable support for the internal HDMI TX Parallel Video Interface
+	  found on the i.MX8MP SoC.
+
diff --git a/drivers/gpu/drm/imx/bridge/Makefile b/drivers/gpu/drm/imx/bridge/Makefile
index 1cfe9623c0d8..512ea98722b8 100644
--- a/drivers/gpu/drm/imx/bridge/Makefile
+++ b/drivers/gpu/drm/imx/bridge/Makefile
@@ -1,3 +1,4 @@ 
 # SPDX-License-Identifier: GPL-2.0
 
 obj-$(CONFIG_DRM_IMX_DW_HDMI_BRIDGE)	+= imx-hdmi.o
+obj-$(CONFIG_DRM_IMX_HDMI_PVI)		+= imx-hdmi-pvi.o
diff --git a/drivers/gpu/drm/imx/bridge/imx-hdmi-pvi.c b/drivers/gpu/drm/imx/bridge/imx-hdmi-pvi.c
new file mode 100644
index 000000000000..962779dc539e
--- /dev/null
+++ b/drivers/gpu/drm/imx/bridge/imx-hdmi-pvi.c
@@ -0,0 +1,201 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+
+/*
+ * Copyright (C) 2022 Pengutronix, Lucas Stach <kernel@pengutronix.de>
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/pm_runtime.h>
+
+#define HTX_PVI_CTL	0x0
+#define  PVI_CTL_OP_VSYNC_POL	BIT(18)
+#define  PVI_CTL_OP_HSYNC_POL	BIT(17)
+#define  PVI_CTL_OP_DE_POL	BIT(16)
+#define  PVI_CTL_INP_VSYNC_POL	BIT(14)
+#define  PVI_CTL_INP_HSYNC_POL	BIT(13)
+#define  PVI_CTL_INP_DE_POL	BIT(12)
+#define  PVI_CTL_INPUT_LCDIF	BIT(2)
+#define  PVI_CTL_EN		BIT(0)
+
+struct imx_hdmi_pvi {
+	struct drm_bridge	bridge;
+	struct device		*dev;
+	struct drm_bridge	*next_bridge;
+	void __iomem		*regs;
+};
+
+static inline struct imx_hdmi_pvi *
+to_imx_hdmi_pvi(struct drm_bridge *bridge)
+{
+	return container_of(bridge, struct imx_hdmi_pvi, bridge);
+}
+
+static int imx_hdmi_pvi_bridge_attach(struct drm_bridge *bridge,
+				enum drm_bridge_attach_flags flags)
+{
+	struct imx_hdmi_pvi *pvi = to_imx_hdmi_pvi(bridge);
+
+	return drm_bridge_attach(bridge->encoder, pvi->next_bridge, bridge, flags);
+}
+
+static void imx_hdmi_pvi_bridge_enable(struct drm_bridge *bridge,
+				       struct drm_bridge_state *bridge_state)
+{
+	struct drm_atomic_state *state = bridge_state->base.state;
+	struct imx_hdmi_pvi *pvi = to_imx_hdmi_pvi(bridge);
+	struct drm_connector_state *conn_state;
+	const struct drm_display_mode *mode;
+	struct drm_crtc_state *crtc_state;
+	struct drm_connector *connector;
+	u32 bus_flags, val;
+
+	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+	conn_state = drm_atomic_get_new_connector_state(state, connector);
+	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+
+	if (WARN_ON(pm_runtime_resume_and_get(pvi->dev)))
+		return;
+
+	mode = &crtc_state->adjusted_mode;
+
+	val = PVI_CTL_INPUT_LCDIF;
+
+	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+		val |= PVI_CTL_OP_VSYNC_POL | PVI_CTL_INP_VSYNC_POL;
+
+	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+		val |= PVI_CTL_OP_HSYNC_POL | PVI_CTL_INP_HSYNC_POL;
+
+	if (pvi->next_bridge->timings)
+		bus_flags = pvi->next_bridge->timings->input_bus_flags;
+	else if (bridge_state)
+		bus_flags = bridge_state->input_bus_cfg.flags;
+
+	if (bus_flags & DRM_BUS_FLAG_DE_HIGH)
+		val |= PVI_CTL_OP_DE_POL | PVI_CTL_INP_DE_POL;
+
+	writel(val, pvi->regs + HTX_PVI_CTL);
+	val |= PVI_CTL_EN;
+	writel(val, pvi->regs + HTX_PVI_CTL);
+}
+
+static void imx_hdmi_pvi_bridge_disable(struct drm_bridge *bridge,
+					struct drm_bridge_state *bridge_state)
+{
+	struct imx_hdmi_pvi *pvi = to_imx_hdmi_pvi(bridge);
+
+	writel(0x0, pvi->regs + HTX_PVI_CTL);
+
+	pm_runtime_put(pvi->dev);
+}
+
+static u32 *pvi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
+					  struct drm_bridge_state *bridge_state,
+					  struct drm_crtc_state *crtc_state,
+					  struct drm_connector_state *conn_state,
+					  u32 output_fmt,
+					  unsigned int *num_input_fmts)
+{
+	struct imx_hdmi_pvi *pvi = to_imx_hdmi_pvi(bridge);
+	struct drm_bridge *next_bridge = pvi->next_bridge;
+	struct drm_bridge_state *next_state;
+
+	if (!next_bridge->funcs->atomic_get_input_bus_fmts)
+		return 0;
+
+	next_state = drm_atomic_get_new_bridge_state(crtc_state->state,
+						     next_bridge);
+
+	return next_bridge->funcs->atomic_get_input_bus_fmts(next_bridge,
+							     next_state,
+							     crtc_state,
+							     conn_state,
+							     output_fmt,
+							     num_input_fmts);
+}
+
+static const struct drm_bridge_funcs imx_hdmi_pvi_bridge_funcs = {
+	.attach		= imx_hdmi_pvi_bridge_attach,
+	.atomic_enable	= imx_hdmi_pvi_bridge_enable,
+	.atomic_disable	= imx_hdmi_pvi_bridge_disable,
+	.atomic_get_input_bus_fmts = pvi_bridge_get_input_bus_fmts,
+	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+	.atomic_reset = drm_atomic_helper_bridge_reset,
+};
+
+static int imx_hdmi_pvi_probe(struct platform_device *pdev)
+{
+	struct device_node *remote;
+	struct imx_hdmi_pvi *pvi;
+
+	pvi = devm_kzalloc(&pdev->dev, sizeof(*pvi), GFP_KERNEL);
+	if (!pvi)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, pvi);
+	pvi->dev = &pdev->dev;
+
+	pvi->regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(pvi->regs))
+		return PTR_ERR(pvi->regs);
+
+	/* Get the next bridge in the pipeline. */
+	remote = of_graph_get_remote_node(pdev->dev.of_node, 1, -1);
+	if (!remote)
+		return -EINVAL;
+
+	pvi->next_bridge = of_drm_find_bridge(remote);
+	of_node_put(remote);
+
+	if (!pvi->next_bridge)
+		return dev_err_probe(&pdev->dev, -EPROBE_DEFER,
+				     "could not find next bridge\n");
+
+	/* Register the bridge. */
+	pvi->bridge.funcs = &imx_hdmi_pvi_bridge_funcs;
+	pvi->bridge.of_node = pdev->dev.of_node;
+	pvi->bridge.timings = pvi->next_bridge->timings;
+
+	drm_bridge_add(&pvi->bridge);
+
+	pm_runtime_enable(&pdev->dev);
+
+	return 0;
+}
+
+static int imx_hdmi_pvi_remove(struct platform_device *pdev)
+{
+	struct imx_hdmi_pvi *pvi = platform_get_drvdata(pdev);
+
+	drm_bridge_remove(&pvi->bridge);
+
+	return 0;
+}
+
+static const struct of_device_id imx_hdmi_pvi_match[] = {
+	{
+		.compatible = "fsl,imx8mp-hdmi-pvi",
+	}, {
+		/* sentinel */
+	},
+};
+MODULE_DEVICE_TABLE(of, imx_hdmi_pvi_match);
+
+static struct platform_driver imx_hdmi_pvi_driver = {
+	.probe	= imx_hdmi_pvi_probe,
+	.remove	= imx_hdmi_pvi_remove,
+	.driver		= {
+		.name = "imx-hdmi-pvi",
+		.of_match_table	= imx_hdmi_pvi_match,
+	},
+};
+module_platform_driver(imx_hdmi_pvi_driver);
+
+MODULE_DESCRIPTION("i.MX8MP HDMI TX Parallel Video Interface bridge driver");
+MODULE_LICENSE("GPL");