Re: [PATCH 2/2] usb: webcam: Invalid size of Processing Unit Descriptor
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: 2021-03-14 02:31:59
Also in:
linux-api, lkml
Hi Pawel, Thank you for the patch. On Mon, Mar 08, 2021 at 11:27:35AM +0100, Pawel Laszczak wrote:
From: Pawel Laszczak <pawell@cadence.com> According with USB Device Class Definition for Video Device the Processing Unit Descriptor bLength should be 12 (10 + bmControlSize), but it has 11. Invalid length caused that Processing Unit Descriptor Test Video form CV tool failed. To fix this issue patch adds bmVideoStandards into uvc_processing_unit_descriptor structure.
The bmVideoStandards field was added in UVC 1.1, it wasn't part of UVC 1.0a. The commit message should explain this. This change looks good to me, but could you also update drivers/usb/gadget/legacy/webcam.c and drivers/usb/gadget/function/f_uvc.c to explicitly set this field to 0 ? With that, Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
quoted hunk ↗ jump to hunk
Signed-off-by: Pawel Laszczak <pawell@cadence.com> --- include/uapi/linux/usb/video.h | 1 + 1 file changed, 1 insertion(+)diff --git a/include/uapi/linux/usb/video.h b/include/uapi/linux/usb/video.h index d854cb19c42c..2a54e8fdd341 100644 --- a/include/uapi/linux/usb/video.h +++ b/include/uapi/linux/usb/video.h@@ -302,6 +302,7 @@ struct uvc_processing_unit_descriptor { __u8 bControlSize; __u8 bmControls[2]; __u8 iProcessing; + __u8 bmVideoStandards; } __attribute__((__packed__)); #define UVC_DT_PROCESSING_UNIT_SIZE(n) (9+(n))
-- Regards, Laurent Pinchart