linux-kernel - [PATCH] v4l: vsp1: Fix continuous mode for dual pipelines

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Message-Id: <1518182305-17988-1-git-send-email-kbingham@kernel.org>
Date:   Fri,  9 Feb 2018 13:18:25 +0000
From:   Kieran Bingham <kbingham@...nel.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        mchehab@...nel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kieran Bingham <kieran.bingham@...asonboard.com>
Cc:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        "Stable v4.14+" <stable@...r.kernel.org>
Subject: [PATCH] v4l: vsp1: Fix continuous mode for dual pipelines

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

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@...r.kernel.org>

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
---
 drivers/media/platform/vsp1/vsp1_dl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
index 8cd03ee45f79..34b5ed2592f8 100644
--- 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_pending(struct vsp1_dl_manager *dlm)
 		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 bool vsp1_dl_hw_active(struct vsp1_dl_manager *dlm)
-- 
2.7.4