linux-kernel - [PATCH AUTOSEL 5.5 039/121] drm/panel: simple: fix osd070t1718

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Date:   Sat, 11 Apr 2020 19:05:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Tomi Valkeinen <tomi.valkeinen@...com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Sasha Levin <sashal@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.5 039/121] drm/panel: simple: fix osd070t1718_19ts sync drive edge

From: Tomi Valkeinen <tomi.valkeinen@...com>

[ Upstream commit fb0629eeeedb6622c16da1aa76a4520daf9a46e2 ]

The panel datasheet says that the panel samples at falling edge, but
does not say anything about h/v sync signals. Testing shows that if the
sync signals are driven on falling edge, the picture on the panel will
be slightly shifted right.

Setting sync drive edge to the same as data drive edge fixes this issue.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Acked-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191114093950.4101-4-tomi.valkeinen@ti.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/panel/panel-simple.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 72f69709f3493..df2c7392463b5 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -2431,7 +2431,8 @@ static const struct panel_desc osddisplays_osd070t1718_19ts = {
 		.height = 91,
 	},
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
-	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE,
+	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE |
+		DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE,
 	.connector_type = DRM_MODE_CONNECTOR_DPI,
 };
 
-- 
2.20.1