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[media] gspca - main: Avoid clobbering all bandwidth when mic in webcam 

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>
This commit is contained in:
Hans de Goede 2011-12-30 18:26:53 -03:00 committed by Mauro Carvalho Chehab
parent 5dae603d84
commit 2d39059a65
1 changed files with 17 additions and 0 deletions
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17
drivers/media/video/gspca/gspca.c
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@ -726,6 +726,23 @@ static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
ep_tb++;
}
/*
* If the camera:
* has a usb audio class interface (a built in usb mic); and
* is a usb 1 full speed device; and
* uses the max full speed iso bandwidth; and
* and has more than 1 alt setting
* then skip the highest alt setting to spare bandwidth for the mic
*/
if (gspca_dev->audio &&
gspca_dev->dev->speed == USB_SPEED_FULL &&
last_bw >= 1000000 &&
i > 1) {
PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
i--;
ep_tb--;
}
/* get the requested bandwidth and start at the highest atlsetting */
bandwidth = which_bandwidth(gspca_dev);
ep_tb--;