linux-kernel - [PATCH v5 03/14] media: mt9m114: Lower minimum vblank value

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Message-Id: <20251230-mt9m114-atomisp-v5-3-763539e76094@oss.qualcomm.com>
Date: Tue, 30 Dec 2025 18:03:00 +0100
From: Hans de Goede <johannes.goede@....qualcomm.com>
To: Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Hans de Goede <johannes.goede@....qualcomm.com>
Subject: [PATCH v5 03/14] media: mt9m114: Lower minimum vblank value

As the comment above the defines says, the minimum values are undocumented
so the lowest values seen in register lists are used.

The version of the mt9m114 driver shipped together with the atomisp code
uses 21 for vblank in its register lists, lower MT9M114_MIN_VBLANK
accordingly.

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Hans de Goede <johannes.goede@....qualcomm.com>
---
 drivers/media/i2c/mt9m114.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/i2c/mt9m114.c b/drivers/media/i2c/mt9m114.c
index bbac5fd9b2ad85a1ab56a7e36de16659bc38a369..d9cc260a13bd9f7dc76b69696ce18b953f43e3d0 100644
--- a/drivers/media/i2c/mt9m114.c
+++ b/drivers/media/i2c/mt9m114.c
@@ -329,13 +329,13 @@
 
 /*
  * The minimum amount of horizontal and vertical blanking is undocumented. The
- * minimum values that have been seen in register lists are 303 and 38, use
+ * minimum values that have been seen in register lists are 303 and 21, use
  * them.
  *
  * Set the default to achieve 1280x960 at 30fps with a 48 MHz pixclock.
  */
 #define MT9M114_MIN_HBLANK				303
-#define MT9M114_MIN_VBLANK				38
+#define MT9M114_MIN_VBLANK				21
 #define MT9M114_DEF_HBLANK				323
 #define MT9M114_DEF_VBLANK				39
 

-- 
2.52.0