From: Hans de Goede Date: Sun, 11 Oct 2009 08:22:29 +0000 (-0300) Subject: V4L/DVB (13142): gspca_mr97310a: small tweak to CIF sensor type 1 exposure setting X-Git-Tag: v2.6.33-rc1~338^2~271 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=d76f975c574230fb00d07848d330e04d97e51475;p=~shefty%2Frdma-dev.git V4L/DVB (13142): gspca_mr97310a: small tweak to CIF sensor type 1 exposure setting The CIF sensor type 1 exposure setting got clamped at 300, as settings below 300 do not work well (and do work for the other sensors). This patch scales the 0-4095 range to 300-4095 instead of ignoring changes between 300, avoiding have a part of the control range where nothing happens. This is esp. important for software autogain as done by libv4l. Signed-off-by: Hans de Goede Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/gspca/mr97310a.c b/drivers/media/video/gspca/mr97310a.c index abc56e37efc..f282f800070 100644 --- a/drivers/media/video/gspca/mr97310a.c +++ b/drivers/media/video/gspca/mr97310a.c @@ -842,8 +842,9 @@ static void setexposure(struct gspca_dev *gspca_dev) return; if (sd->cam_type == CAM_TYPE_CIF && sd->sensor_type == 1) { - /* This cam does not like very low exposure settings */ - exposure = (sd->exposure < 300) ? 300 : sd->exposure; + /* This cam does not like exposure settings > 300, + so scale 0 - 4095 to 300 - 4095 */ + exposure = (sd->exposure * 9267) / 10000 + 300; sensor_write1(gspca_dev, 3, exposure >> 4); sensor_write1(gspca_dev, 4, exposure & 0x0f); } else {