From: Ricardo Ribalda <ribalda@chromium.org>
Date: Fri, 18 Jun 2021 12:29:14 +0000 (+0200)
Subject: media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE
X-Git-Tag: v5.16-rc1~173^2~216
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8865c537037bb30b9e84c91e3386cc926f024f78;p=thirdparty%2Fkernel%2Flinux.git

media: uvcvideo: Increase the size of UVC_METADATA_BUF_SIZE

Hans has discovered that in his test device, for the H264 format
bytesused goes up to about 570, for YUYV it will actually go up
to a bit over 5000 bytes, and for MJPG up to about 2706 bytes.

We should also, according to V4L2_META_FMT_UVC docs, drop headers when
the buffer is full.

Credit-to: Hans Verkuil <hverkuil@xs4all.nl>

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---

diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 5eb7e87f8430c..37a092d717cfe 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -524,7 +524,7 @@ struct uvc_stats_stream {
 	unsigned int max_sof;		/* Maximum STC.SOF value */
 };
 
-#define UVC_METADATA_BUF_SIZE 1024
+#define UVC_METADATA_BUF_SIZE 10240
 
 /**
  * struct uvc_copy_op: Context structure to schedule asynchronous memcpy