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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>,
        Mauro Carvalho Chehab <mchehab@s-opensource.com>
Subject: [PATCH 4.15 13/53] media: v4l: vsp1: Fix header display list status check in continuous mode
Date:   Tue, 17 Apr 2018 17:58:38 +0200
Message-Id: <20180417155723.780119465@linuxfoundation.org>
In-Reply-To: <20180417155723.091120060@linuxfoundation.org>
References: <20180417155723.091120060@linuxfoundation.org>
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4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

commit 613928e85317b945c863bb893f5737d2f22f5425 upstream.

To allow dual pipelines utilising two WPF entities when available, the
VSP was updated to support header-mode display list in continuous
pipelines.

A small bug in the status check of the command register causes the
second pipeline to be directly afflicted by the running of the first;
appearing as a perceived performance issue with stuttering display.

Fix the vsp1_dl_list_hw_update_pending() call to ensure that the read
comparison corresponds to the correct pipeline.

Fixes: eaf4bfad6ad8 ("v4l: vsp1: Add support for header display lists in continuous mode")

Cc: "Stable v4.14+" <stable@vger.kernel.org>
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/platform/vsp1/vsp1_dl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/media/platform/vsp1/vsp1_dl.c
+++ b/drivers/media/platform/vsp1/vsp1_dl.c
@@ -509,7 +509,8 @@ static bool vsp1_dl_list_hw_update_pendi
 		return !!(vsp1_read(vsp1, VI6_DL_BODY_SIZE)
 			  & VI6_DL_BODY_SIZE_UPD);
 	else
-		return !!(vsp1_read(vsp1, VI6_CMD(dlm->index) & VI6_CMD_UPDHDR));
+		return !!(vsp1_read(vsp1, VI6_CMD(dlm->index))
+			  & VI6_CMD_UPDHDR);
 }
 
 static void vsp1_dl_list_hw_enqueue(struct vsp1_dl_list *dl)