[media] gspca: Add a need_max_bandwidth flag to sd_desc
Some cameras will pretty much entirely fill all the image buffers all the
time even though they are using compression.
This patch adds a flag to sd_desc, which drivers for such cameras can set.
When this flag is set the bandwidth calculation code will no longer
assume that the image buffer size is a worst case and less bandwidth than
imagebufsize * fps will be used on average.
This patch sets this new flag for 3 drivers:
* For spca561 (for rev12a cameras) and nw80x cams as these simply don't work
when given less bandwidth than imagebufsize * fps.
* For sn9c20x cameras, because these show severy jpeg artifacts when
given less bandwidth than imagebufsize * fps and since these are usb2
cameras there is plenty bandwidth anyways.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/gspca/sn9c20x.c b/drivers/media/video/gspca/sn9c20x.c
index 86e07a1..7350718 100644
--- a/drivers/media/video/gspca/sn9c20x.c
+++ b/drivers/media/video/gspca/sn9c20x.c
@@ -2048,6 +2048,7 @@
struct cam *cam;
cam = &gspca_dev->cam;
+ cam->needs_full_bandwidth = 1;
sd->sensor = (id->driver_info >> 8) & 0xff;
sd->i2c_addr = id->driver_info & 0xff;
