media: uvcvideo: Fix bandwidth issue for Alcor camera
authorchenchangcheng <chenchangcheng@kylinos.cn>
Sat, 10 May 2025 06:18:03 +0000 (14:18 +0800)
committerHans Verkuil <hverkuil@xs4all.nl>
Mon, 16 Jun 2025 06:43:22 +0000 (08:43 +0200)
commit9764401bf6f8a20eb11c2e78470f20fee91a9ea7
tree6022ad029f33ef9ee387668723726b1806eaed07
parent19272b37aa4f83ca52bdf9c16d5d81bdd1354494
media: uvcvideo: Fix bandwidth issue for Alcor camera

Some broken device return wrong dwMaxPayloadTransferSize fields as
follows:

[  218.632537] uvcvideo: Device requested 2752512 B/frame bandwidth.
[  218.632598] uvcvideo: No fast enough alt setting for requested bandwidth.

When dwMaxPayloadTransferSize is greater than maxpsize, it will prevent
the camera from starting. So use the bandwidth of maxpsize.

Signed-off-by: chenchangcheng <chenchangcheng@kylinos.cn>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20250510061803.811433-1-ccc194101@163.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
drivers/media/usb/uvc/uvc_video.c