6.6-stable review patch. If anyone has any objections, please let me know.
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From: Tomi Valkeinen tomi.valkeinen@ideasonboard.com
[ 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@ideasonboard.com Reviewed-by: Aradhya Bhatia a-bhatia1@ti.com Link: https://lore.kernel.org/r/20231106-am65-dss-clk-edge-v1-1-4a959fec0e1e@ideas... Signed-off-by: Nishanth Menon nm@ti.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/ti/k3-am65-main.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi index bc460033a37a..c98068b6c122 100644 --- a/arch/arm64/boot/dts/ti/k3-am65-main.dtsi +++ b/arch/arm64/boot/dts/ti/k3-am65-main.dtsi @@ -1034,7 +1034,7 @@ 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;