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-rw-r--r--drivers/media/video/gspca/sonixb.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/media/video/gspca/sonixb.c b/drivers/media/video/gspca/sonixb.c
index bde9ea9b980e..64bc758fbae5 100644
--- a/drivers/media/video/gspca/sonixb.c
+++ b/drivers/media/video/gspca/sonixb.c
@@ -52,6 +52,7 @@ MODULE_LICENSE("GPL");
struct sd {
struct gspca_dev gspca_dev; /* !! must be the first item */
atomic_t avg_lum;
+ int prev_avg_lum;
unsigned char gain;
unsigned char exposure;
@@ -1022,10 +1023,19 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev,
} else {
lum = data[i + 8] + (data[i + 9] << 8);
}
- if (lum == 0) {
+ /* When exposure changes midway a frame we
+ get a lum of 0 in this case drop 2 frames
+ as the frames directly after an exposure
+ change have an unstable image. Sometimes lum
+ *really* is 0 (cam used in low light with
+ low exposure setting), so do not drop frames
+ if the previous lum was 0 too. */
+ if (lum == 0 && sd->prev_avg_lum != 0) {
lum = -1;
sd->frames_to_drop = 2;
- }
+ sd->prev_avg_lum = 0;
+ } else
+ sd->prev_avg_lum = lum;
atomic_set(&sd->avg_lum, lum);
if (sd->frames_to_drop) {