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media: mt9m114: Tweak default hblank and vblank for more accurate fps

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The PLL gets programmed to achieve a 48 MHz pixelclock, with the current
vblank + hblank defaults this results in a fps of:

48000000 / ((1296 + 307) * (976 + 23) = 29.974 fps

Tweak the defaults to get closer to 30 fps:

48000000 / ((1296 + 308) * (976 + 21) = 30.015 fps

This improves things from being 0.026 fps too low to 0.015 fps too high.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Hans de Goede 2025-12-30 18:03:02 +01:00 committed by Hans Verkuil
parent 0fa4baded5
commit 432d109333
1 changed files with 2 additions and 2 deletions
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4
drivers/media/i2c/mt9m114.c
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@ -337,8 +337,8 @@
*/
#define MT9M114_MIN_HBLANK 303
#define MT9M114_MIN_VBLANK 21
#define MT9M114_DEF_HBLANK 307
#define MT9M114_DEF_VBLANK 23
#define MT9M114_DEF_HBLANK 308
#define MT9M114_DEF_VBLANK 21
#define MT9M114_DEF_FRAME_RATE 30
#define MT9M114_MAX_FRAME_RATE 120