From: Anson Huang <Anson.Huang@xxxxxxx> According to latest datasheet (Rev.1, 10/2018) from below links, in the consumer datasheet, 1.5GHz is mentioned as highest opp but depends on speed grading fuse, and in the industrial datasheet, 1.3GHz is mentioned as highest opp but depends on speed grading fuse. 1.5GHz and 1.3GHz opp use same voltage, so no need for consumer part to support 1.3GHz opp, with same voltage, CPU should run at highest frequency in order to go into idle as quick as possible, this can save power. That means for consumer part, 1GHz/1.5GHz are supported, for industrial part, 800MHz/1.3GHz are supported, and then check the speed grading fuse to limit the highest CPU frequency further. Correct the market segment bits in opp table to make them work according to datasheets. https://www.nxp.com/docs/en/data-sheet/IMX8MDQLQIEC.pdf https://www.nxp.com/docs/en/data-sheet/IMX8MDQLQCEC.pdf Fixes: 12629c5c3749 ("arm64: dts: imx8mq: Add cpu speed grading and all OPPs") Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx> --- Changes since V1: - remove the comment to avoid any confusion. --- arch/arm64/boot/dts/freescale/imx8mq.dtsi | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi index 9d99191..477c523 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi @@ -169,15 +169,14 @@ opp-1300000000 { opp-hz = /bits/ 64 <1300000000>; opp-microvolt = <1000000>; - opp-supported-hw = <0xc>, <0x7>; + opp-supported-hw = <0xc>, <0x4>; clock-latency-ns = <150000>; }; opp-1500000000 { opp-hz = /bits/ 64 <1500000000>; opp-microvolt = <1000000>; - /* Consumer only but rely on speed grading */ - opp-supported-hw = <0x8>, <0x7>; + opp-supported-hw = <0x8>, <0x3>; clock-latency-ns = <150000>; }; }; -- 2.7.4
