4.15-stable review patch. If anyone has any objections, please let me know.
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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)