linux-kernel - [PATCH 03/13] media: i2c: ov5647: Correct minimum VBLANK value

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Message-Id: <20251028-b4-rpi-ov5647-v1-3-098413454f5e@ideasonboard.com>
Date: Tue, 28 Oct 2025 12:57:14 +0530
From: Jai Luthra <jai.luthra@...asonboard.com>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Dave Stevenson <dave.stevenson@...pberrypi.com>, 
 Jacopo Mondi <jacopo@...ndi.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Mauro Carvalho Chehab <mchehab+huawei@...nel.org>, 
 Kieran Bingham <kieran.bingham@...asonboard.com>, 
 David Plowman <david.plowman@...pberrypi.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Peter Robinson <pbrobinson@...il.com>, Stefan Wahren <wahrenst@....net>, 
 "Ivan T. Ivanov" <iivanov@...e.de>, 
 Jai Luthra <jai.luthra@...asonboard.com>
Subject: [PATCH 03/13] media: i2c: ov5647: Correct minimum VBLANK value

From: David Plowman <david.plowman@...pberrypi.com>

Trial and error reveals that the minimum vblank value appears to be 24
(the OV5647 data sheet does not give any clues). This fixes streaming
lock-ups in full resolution mode.

Fixes: 2512c06441e3 ("media: ov5647: Support V4L2_CID_VBLANK control")
Signed-off-by: David Plowman <david.plowman@...pberrypi.com>
Signed-off-by: Jai Luthra <jai.luthra@...asonboard.com>
---
 drivers/media/i2c/ov5647.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/i2c/ov5647.c b/drivers/media/i2c/ov5647.c
index 4fed655f5a11c38e76d1ccc9ae9155cf945684ab..dfe36116e6d3936aa0568f172c79ad4dad21f8c2 100644
--- a/drivers/media/i2c/ov5647.c
+++ b/drivers/media/i2c/ov5647.c
@@ -73,7 +73,7 @@
 #define OV5647_PIXEL_ARRAY_WIDTH	2592U
 #define OV5647_PIXEL_ARRAY_HEIGHT	1944U

-#define OV5647_VBLANK_MIN		4
+#define OV5647_VBLANK_MIN		24
 #define OV5647_VTS_MAX			32767

 #define OV5647_EXPOSURE_MIN		4

-- 
2.51.0