usb: gadget: g_webcam: Send color matching descriptor per frame

commit e95765e97d9cb93258a4840440d410fa6ff7e819 upstream.

Currently the color matching descriptor is only sent across the wire
a single time, following the descriptors for each format and frame.
According to the UVC 1.5 Specification 3.9.2.6 ("Color Matching
Descriptors"):

"Only one instance is allowed for a given format and if present,
the Color Matching descriptor shall be placed following the Video
and Still Image Frame descriptors for that format".

Add another reference to the color matching descriptor after the
yuyv frames so that it's correctly transmitted for that format
too.

Fixes: a9914127e834 ("USB gadget: Webcam device")
Cc: stable <stable@kernel.org>
Signed-off-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Link: https://lore.kernel.org/r/20221216160528.479094-1-dan.scally@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/legacy/webcam.c b/drivers/usb/gadget/legacy/webcam.c
index 94e2286..e9b5846 100644 (file)
--- a/drivers/usb/gadget/legacy/webcam.c
+++ b/drivers/usb/gadget/legacy/webcam.c
@@ -293,6 +293,7 @@ static const struct uvc_descriptor_header * const uvc_fs_streaming_cls[] = {
        (const struct uvc_descriptor_header *) &uvc_format_yuv,
        (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
        (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
+       (const struct uvc_descriptor_header *) &uvc_color_matching,
        (const struct uvc_descriptor_header *) &uvc_format_mjpg,
        (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
        (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
@@ -305,6 +306,7 @@ static const struct uvc_descriptor_header * const uvc_hs_streaming_cls[] = {
        (const struct uvc_descriptor_header *) &uvc_format_yuv,
        (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
        (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
+       (const struct uvc_descriptor_header *) &uvc_color_matching,
        (const struct uvc_descriptor_header *) &uvc_format_mjpg,
        (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
        (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,
@@ -317,6 +319,7 @@ static const struct uvc_descriptor_header * const uvc_ss_streaming_cls[] = {
        (const struct uvc_descriptor_header *) &uvc_format_yuv,
        (const struct uvc_descriptor_header *) &uvc_frame_yuv_360p,
        (const struct uvc_descriptor_header *) &uvc_frame_yuv_720p,
+       (const struct uvc_descriptor_header *) &uvc_color_matching,
        (const struct uvc_descriptor_header *) &uvc_format_mjpg,
        (const struct uvc_descriptor_header *) &uvc_frame_mjpg_360p,
        (const struct uvc_descriptor_header *) &uvc_frame_mjpg_720p,