From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Tue, 18 Jun 2024 18:46:44 +0000 (+0300)
Subject: media: renesas: vsp1: Print debug message to diagnose validation failure
X-Git-Tag: io_uring-6.11-20240722~50^2~83^2~17
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=dce863203d259d019693b5d082b0a4c4b5063cd1;p=linux-block.git

media: renesas: vsp1: Print debug message to diagnose validation failure

When formats don't match between a subdev and a connected video device,
starting streaming returns an error without giving the user any
indication as to what went wrong. To help debugging pipeline
misconfigurations, add a debug message that indicates the cause of the
failure.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
---

diff --git a/drivers/media/platform/renesas/vsp1/vsp1_video.c b/drivers/media/platform/renesas/vsp1/vsp1_video.c
index 5a9cb0e5640e..28cee0304e77 100644
--- a/drivers/media/platform/renesas/vsp1/vsp1_video.c
+++ b/drivers/media/platform/renesas/vsp1/vsp1_video.c
@@ -78,8 +78,14 @@ static int vsp1_video_verify_format(struct vsp1_video *video)
 
 	if (video->rwpf->fmtinfo->mbus != fmt.format.code ||
 	    video->rwpf->format.height != fmt.format.height ||
-	    video->rwpf->format.width != fmt.format.width)
-		return -EINVAL;
+	    video->rwpf->format.width != fmt.format.width) {
+		dev_dbg(video->vsp1->dev,
+			"Format mismatch: 0x%04x/%ux%u != 0x%04x/%ux%u\n",
+			video->rwpf->fmtinfo->mbus, video->rwpf->format.width,
+			video->rwpf->format.height, fmt.format.code,
+			fmt.format.width, fmt.format.height);
+		return -EPIPE;
+	}
 
 	return 0;
 }