[PATCH linux dev-5.15] media: aspeed-video: ignore interrupts that aren't enabled

[Zev Weiss]

As partially addressed in commit 65d270acb2d6 ("media: aspeed: clear
garbage interrupts"), the ASpeed video engine sometimes asserts
interrupts that the driver hasn't enabled.  In addition to the
CAPTURE_COMPLETE and FRAME_COMPLETE interrupts dealt with in that
patch, COMP_READY has also been observed.  Instead of playing
whack-a-mole with each one individually, we can instead just blanket
ignore everything we haven't explicitly enabled.

Signed-off-by: Zev Weiss <zev at bewilderbeest.net>
Tested-by: Lei YU <yulei.sh at bytedance.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco at xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei at kernel.org>
---

This patch fixes a problem that can sometimes bite the OpenBMC iKVM, and
is now in mainline as commit ea8a5c118e24.

 drivers/media/platform/aspeed-video.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 7bb6babdcade..77611c296a25 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -563,6 +563,12 @@ static irqreturn_t aspeed_video_irq(int irq, void *arg)
 	struct aspeed_video *video = arg;
 	u32 sts = aspeed_video_read(video, VE_INTERRUPT_STATUS);
 
+	/*
+	 * Hardware sometimes asserts interrupts that we haven't actually
+	 * enabled; ignore them if so.
+	 */
+	sts &= aspeed_video_read(video, VE_INTERRUPT_CTRL);
+
 	/*
 	 * Resolution changed or signal was lost; reset the engine and
 	 * re-initialize
@@ -629,16 +635,6 @@ static irqreturn_t aspeed_video_irq(int irq, void *arg)
 			aspeed_video_start_frame(video);
 	}
 
-	/*
-	 * CAPTURE_COMPLETE and FRAME_COMPLETE interrupts come even when these
-	 * are disabled in the VE_INTERRUPT_CTRL register so clear them to
-	 * prevent unnecessary interrupt calls.
-	 */
-	if (sts & VE_INTERRUPT_CAPTURE_COMPLETE)
-		sts &= ~VE_INTERRUPT_CAPTURE_COMPLETE;
-	if (sts & VE_INTERRUPT_FRAME_COMPLETE)
-		sts &= ~VE_INTERRUPT_FRAME_COMPLETE;
-
 	return sts ? IRQ_NONE : IRQ_HANDLED;
 }
 
-- 
2.33.1