openwrt/target/linux/bcm27xx/patches-5.15/950-0579-drm-vc4-Add-support-for-composite-syncs-to-vc4_dpi.patch

From bbd8dd64c1083232f3da8e097207a5b539ab91c9 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 25 Nov 2021 14:45:33 +0000
Subject: [PATCH] drm/vc4: Add support for composite syncs to vc4_dpi

The hardware can combine H&V syncs onto the output enable line
as composite syncs, so add the relevant configuration to do that.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_dpi.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -131,7 +131,7 @@ static void vc4_dpi_encoder_enable(struc
 	struct vc4_dpi *dpi = vc4_encoder->dpi;
 	struct drm_connector_list_iter conn_iter;
 	struct drm_connector *connector = NULL, *connector_scan;
-	u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
+	u32 dpi_c = DPI_ENABLE;
 	int ret;
 
 	/* Look up the connector attached to DPI so we can get the
@@ -192,15 +192,22 @@ static void vc4_dpi_encoder_enable(struc
 		dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1, DPI_FORMAT);
 	}
 
-	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
-		dpi_c |= DPI_HSYNC_INVERT;
-	else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
-		dpi_c |= DPI_HSYNC_DISABLE;
-
-	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
-		dpi_c |= DPI_VSYNC_INVERT;
-	else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
-		dpi_c |= DPI_VSYNC_DISABLE;
+	if (mode->flags & DRM_MODE_FLAG_CSYNC) {
+		if (mode->flags & DRM_MODE_FLAG_NCSYNC)
+			dpi_c |= DPI_OUTPUT_ENABLE_INVERT;
+	} else {
+		dpi_c |= DPI_OUTPUT_ENABLE_MODE;
+
+		if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+			dpi_c |= DPI_HSYNC_INVERT;
+		else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
+			dpi_c |= DPI_HSYNC_DISABLE;
+
+		if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+			dpi_c |= DPI_VSYNC_INVERT;
+		else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
+			dpi_c |= DPI_VSYNC_DISABLE;
+	}
 
 	DPI_WRITE(DPI_C, dpi_c);