From: Hans de Goede Date: Fri, 4 Jul 2008 21:39:08 +0000 (-0300) Subject: V4L/DVB (8198): gspca: Frame decoding errors when PAC207 in full daylight. X-Git-Tag: firefly_0821_release~19561^2~140 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=46ccdafa71c1c95de002ce7a31e700cf5c8195df;p=firefly-linux-kernel-4.4.55.git V4L/DVB (8198): gspca: Frame decoding errors when PAC207 in full daylight. Signed-off-by: Hans de Goede Signed-off-by: Jean-Francois Moine Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/gspca/pac207.c b/drivers/media/video/gspca/pac207.c index 0135ba599e81..ab83d7b69348 100644 --- a/drivers/media/video/gspca/pac207.c +++ b/drivers/media/video/gspca/pac207.c @@ -40,9 +40,17 @@ MODULE_LICENSE("GPL"); #define PAC207_BRIGHTNESS_MAX 255 #define PAC207_BRIGHTNESS_DEFAULT 4 /* power on default: 4 */ -#define PAC207_EXPOSURE_MIN 4 +/* An exposure value of 4 also works (3 does not) but then we need to lower + the compression balance setting when in 352x288 mode, otherwise the usb + bandwidth is not enough and packets get dropped resulting in corrupt + frames. The problem with this is that when the compression balance gets + lowered below 0x80, the pac207 starts using a different compression + algorithm for some lines, these lines get prefixed with a 0x2dd2 prefix + and currently we do not know how to decompress these lines, so for now + we use a minimum exposure value of 5 */ +#define PAC207_EXPOSURE_MIN 5 #define PAC207_EXPOSURE_MAX 26 -#define PAC207_EXPOSURE_DEFAULT 4 /* power on default: 3 ?? */ +#define PAC207_EXPOSURE_DEFAULT 5 /* power on default: 3 ?? */ #define PAC207_EXPOSURE_KNEE 11 /* 4 = 30 fps, 11 = 8, 15 = 6 */ #define PAC207_GAIN_MIN 0