在 2022/5/16 16:53, Maxime Ripard 写道:
On Mon, May 16, 2022 at 10:15:16AM +0800, qianfanguijin@xxxxxxx wrote:From: qianfan Zhao <qianfanguijin@xxxxxxx> OPP table value is get from allwinner lichee linux-3.10 kernel driver Signed-off-by: qianfan Zhao <qianfanguijin@xxxxxxx> --- arch/arm/boot/dts/sun8i-r40.dtsi | 42 ++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/arch/arm/boot/dts/sun8i-r40.dtsi b/arch/arm/boot/dts/sun8i-r40.dtsi index 291f4784e86c..8949153eb0eb 100644 --- a/arch/arm/boot/dts/sun8i-r40.dtsi +++ b/arch/arm/boot/dts/sun8i-r40.dtsi @@ -54,6 +54,36 @@ / { #size-cells = <1>; interrupt-parent = <&gic>;+ cpu0_opp_table: opp_table0 {+ compatible = "operating-points-v2"; + opp-shared; + + opp-720000000 { + opp-hz = /bits/ 64 <720000000>; + opp-microvolt = <1000000 1000000 1300000>; + clock-latency-ns = <2000000>; + }; + + opp-912000000 { + opp-hz = /bits/ 64 <912000000>; + opp-microvolt = <1100000 1100000 1300000>; + clock-latency-ns = <2000000>; + }; + + opp-1008000000 { + opp-hz = /bits/ 64 <1008000000>; + opp-microvolt = <1160000 1160000 1300000>; + clock-latency-ns = <2000000>; + }; + + /* The opp table of the cpu frequency that exceeds 1G + * is not defined here. They require higher operating + * current, which may exceed the 500mA limited if the + * system is powered by USB. You can add them to the + * board's DTS is you make sure. + */That's not the issue though. The issue is that the board is setup with a CPU voltage at 1160mV, and if we raise the frequency to a higher OPP without raising the voltage as well, the CPU will crash.
Yes, this is a issue and if the dts doesn't has "cpu-supply" node. The comment above is found while testing. 100% cpu load @ 4x1.2G will consume about 800mA@5V current, the board will reboot if it is powered by USB. So I leave those comments. I am thinking your suggestion to write the opp part to a dtsi like A64. Should I adding all supported freq? I am preparing a new version which including cpu cooling.
Maxime
