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-rw-r--r--drivers/media/video/gspca/pac207.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/media/video/gspca/pac207.c b/drivers/media/video/gspca/pac207.c
index 0135ba599e8..ab83d7b6934 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