This is a note to let you know that I've just added the patch titled
arm64: dts: ti: k3-am65-main: Fix DSS irq trigger type
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-dts-ti-k3-am65-main-fix-dss-irq-trigger-type.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 268ed50368164578252269385ce67583272c457f
Author: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Date: Mon Nov 6 11:57:48 2023 +0200
arm64: dts: ti: k3-am65-main: Fix DSS irq trigger type
[ Upstream commit b57160859263c083c49482b0d083a586b1517f78 ]
DSS irq trigger type is set to IRQ_TYPE_EDGE_RISING in the DT file, but
the TRM says it is level triggered.
For some reason triggering on rising edge results in double the amount
of expected interrupts, e.g. for normal page flipping test the number of
interrupts per second is 2 * fps. It is as if the IRQ triggers on both
edges. There are no other side effects to this issue than slightly
increased CPU & power consumption due to the extra interrupt.
Switching to IRQ_TYPE_LEVEL_HIGH is correct and fixes the issue, so
let's do that.
Fixes: fc539b90eda2 ("arm64: dts: ti: am654: Add DSS node")
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Reviewed-by: Aradhya Bhatia <a-bhatia1@xxxxxx>
Link: https://lore.kernel.org/r/20231106-am65-dss-clk-edge-v1-1-4a959fec0e1e@xxxxxxxxxxxxxxxx
Signed-off-by: Nishanth Menon <nm@xxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
index 4f232f575ab2..b729d2dee209 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi
@@ -855,7 +855,7 @@ dss: dss@4a00000 {
assigned-clocks = <&k3_clks 67 2>;
assigned-clock-parents = <&k3_clks 67 5>;
- interrupts = <GIC_SPI 166 IRQ_TYPE_EDGE_RISING>;
+ interrupts = <GIC_SPI 166 IRQ_TYPE_LEVEL_HIGH>;
dma-coherent;
