[U-Boot] [PATCH 04/40] arm64: zynqmp: Reduced min-residency time for idle state node

Michal Simek michal.simek at xilinx.com
Mon Nov 6 12:12:36 UTC 2017


From: Jolly Shah <jolly.shah at xilinx.com>

Changed min-residence to 10ms(was 100 ms) for cpu-sleep-0.
Tried lower values 5ms and 8ms and it worked fine with Debug Off.
But to accommodate PM Debug On case, 10 ms is required. With this
change, low power idle state is into effect more frequently.
Measured boot time with PM debugs On and Off. No change observed
compared to 100ms value.

Signed-off-by: Jolly Shah <jollys at xilinx.com>
Acked-by: Will Wong <willw at xilinx.com>
Tested-by: Koteswararao Nayudu <kotin at xilinx.com>
Signed-off-by: Michal Simek <michal.simek at xilinx.com>
---

 arch/arm/dts/zynqmp.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index 0759a2b7234a..fc34033f9415 100644
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -62,7 +62,7 @@
 				local-timer-stop;
 				entry-latency-us = <300>;
 				exit-latency-us = <600>;
-				min-residency-us = <800000>;
+				min-residency-us = <10000>;
 			};
 		};
 	};
-- 
1.9.1



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