arm64: dts: imx8mq-librem5: Limit uSDHC2 frequency to 50MHz

SparkLAN card has stability issues at 100MHz. It still appears to be
able to max out its throughput this way, so limit the frequency to
ensure stable operation.

Signed-off-by: Sebastian Krzyszkowiak <sebastian.krzyszkowiak@puri.sm>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
index 5e0bf127e7e5be8846c277ea1b041398d9407e02..5bc9654cd436c6d4141501f3f246ca8202fc03b0 100644 (file)
--- a/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mq-librem5.dtsi
@@ -1424,7 +1424,7 @@
 
 &usdhc2 {
        assigned-clocks = <&clk IMX8MQ_CLK_USDHC2>;
-       assigned-clock-rates = <200000000>;
+       assigned-clock-rates = <50000000>;
        pinctrl-names = "default", "state_100mhz", "state_200mhz";
        pinctrl-0 = <&pinctrl_usdhc2>;
        pinctrl-1 = <&pinctrl_usdhc2_100mhz>;
@@ -1434,7 +1434,7 @@
        mmc-pwrseq = <&usdhc2_pwrseq>;
        post-power-on-delay-ms = <20>;
        cd-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
-       max-frequency = <100000000>;
+       max-frequency = <50000000>;
        disable-wp;
        cap-sdio-irq;
        keep-power-in-suspend;