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[5/6] v4l: vsp1: Fill display list headers without holding dlm spinlock

Message ID 20170615082409.9523-6-laurent.pinchart+renesas@ideasonboard.com (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show

Commit Message

Laurent Pinchart June 15, 2017, 8:24 a.m. UTC 
The display list headers are filled using information from the display
list only. Lower the display list manager spinlock contention by filling
the headers without holding the lock.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
---
 drivers/media/platform/vsp1/vsp1_dl.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
index 7d8f37772b56..534100581404 100644
--- a/drivers/media/platform/vsp1/vsp1_dl.c
+++ b/drivers/media/platform/vsp1/vsp1_dl.c
@@ -483,8 +483,6 @@  void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
 	unsigned long flags;
 	bool update;
 
-	spin_lock_irqsave(&dlm->lock, flags);
-
 	if (dl->dlm->mode == VSP1_DL_MODE_HEADER) {
 		struct vsp1_dl_list *dl_child;
 
@@ -501,7 +499,11 @@  void vsp1_dl_list_commit(struct vsp1_dl_list *dl)
 
 			vsp1_dl_list_fill_header(dl_child, last);
 		}
+	}
 
+	spin_lock_irqsave(&dlm->lock, flags);
+
+	if (dl->dlm->mode == VSP1_DL_MODE_HEADER) {
 		/*
 		 * Commit the head display list to hardware. Chained headers
 		 * will auto-start.