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The following rules define how the L1.1 and L1.2 substates are entered: Both the Upstream and Downstream Ports must monitor the logical state of the CLKREQ# signal. Typical implement is using open drain, which connect RC's clkreq# to EP's clkreq# together and pull up clkreq#. imx8mm-evk matches this requirement, so add supports-clkreq to allow PCIe device enter ASPM L1 Sub-State. Signed-off-by: Richard Zhu --- arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi index ff7ca20752309..6eab8a6001dbf 100644 --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi @@ -542,6 +542,7 @@ &pcie0 { assigned-clock-parents = <&clk IMX8MM_SYS_PLL2_50M>, <&clk IMX8MM_SYS_PLL2_250M>; vpcie-supply = <®_pcie0>; + supports-clkreq; status = "okay"; }; -- 2.37.1