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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
@@ -202,15 +202,22 @@ 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);
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