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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#. imx8qxp-mek 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/imx8qxp-mek.dts | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts index 7b03374455410..9c457c2236a61 100644 --- a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts +++ b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts @@ -631,6 +631,7 @@ &pcie0 { pinctrl-names = "default"; reset-gpios = <&lsio_gpio4 0 GPIO_ACTIVE_LOW>; vpcie-supply = <®_pcieb>; + supports-clkreq; status = "okay"; }; -- 2.37.1