linux-kernel - [PATCH] usb: gadget: uvc: fix try format returns on uncompressed formats

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Message-Id: <20240221-uvc-gadget-uncompressed-v1-1-f55e97287cae@pengutronix.de>
Date: Wed, 21 Feb 2024 23:08:31 +0100
From: Michael Grzeschik <m.grzeschik@...gutronix.de>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Daniel Scally <dan.scally@...asonboard.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Michael Grzeschik <m.grzeschik@...gutronix.de>
Subject: [PATCH] usb: gadget: uvc: fix try format returns on uncompressed
 formats

When setting uncompressed formats, the values of bytesperline and
sizeimage can already be determined by using the v4l2_fill_pixfmt helper
function. We change the try_fmt function to use the helper instead.

Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
---
 drivers/usb/gadget/function/uvc_v4l2.c | 24 +++++++++++++++++++-----
 1 file changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c
index c7e5fa4f29e03..a024aecb76dc3 100644
--- a/drivers/usb/gadget/function/uvc_v4l2.c
+++ b/drivers/usb/gadget/function/uvc_v4l2.c
@@ -260,12 +260,26 @@ uvc_v4l2_try_format(struct file *file, void *fh, struct v4l2_format *fmt)
 	if (!uframe)
 		return -EINVAL;
 
-	fmt->fmt.pix.width = uframe->frame.w_width;
-	fmt->fmt.pix.height = uframe->frame.w_height;
+	if (uformat->type == UVCG_UNCOMPRESSED) {
+		struct uvcg_uncompressed *u =
+			to_uvcg_uncompressed(&uformat->group.cg_item);
+		if (!u)
+			return 0;
+
+		v4l2_fill_pixfmt(&fmt->fmt.pix, fmt->fmt.pix.pixelformat,
+				 uframe->frame.w_width, uframe->frame.w_height);
+
+		if (fmt->fmt.pix.sizeimage != (uvc_v4l2_get_bytesperline(uformat, uframe) *
+						uframe->frame.w_height))
+			return -EINVAL;
+	} else {
+		fmt->fmt.pix.width = uframe->frame.w_width;
+		fmt->fmt.pix.height = uframe->frame.w_height;
+		fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);
+		fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);
+		fmt->fmt.pix.pixelformat = to_uvc_format(uformat)->fcc;
+	}
 	fmt->fmt.pix.field = V4L2_FIELD_NONE;
-	fmt->fmt.pix.bytesperline = uvc_v4l2_get_bytesperline(uformat, uframe);
-	fmt->fmt.pix.sizeimage = uvc_get_frame_size(uformat, uframe);
-	fmt->fmt.pix.pixelformat = to_uvc_format(uformat)->fcc;
 	fmt->fmt.pix.colorspace = V4L2_COLORSPACE_SRGB;
 	fmt->fmt.pix.priv = 0;
 

---
base-commit: 3bf0514dc6f36f81ee11b1becd977cb87b4c90c6
change-id: 20240221-uvc-gadget-uncompressed-ab5dce996ed5

Best regards,
-- 
Michael Grzeschik <m.grzeschik@...gutronix.de>