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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#. imx8mq-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/imx8mq-evk.dts | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts index a88bc90346636..852992b915a39 100644 --- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts +++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts @@ -375,6 +375,7 @@ &pcie0 { <&clk IMX8MQ_CLK_PCIE1_PHY>, <&clk IMX8MQ_CLK_PCIE1_AUX>; vph-supply = <&vgen5_reg>; + supports-clkreq; status = "okay"; }; @@ -398,6 +399,7 @@ &pcie1 { <&clk IMX8MQ_CLK_PCIE2_AUX>; vpcie-supply = <®_pcie1>; vph-supply = <&vgen5_reg>; + supports-clkreq; status = "okay"; }; -- 2.37.1