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Limit Nintendo Switch's external SD SDHCI bus clock speed.

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This will fix Nintendo Switch does not load rootfs with some
"incompatible" SD cards, which supports UHS SDR104 speed.

So, this patch will solve this problem by limiting bus speed
to Switch's hardware can handle.

By experimentally obtained experience, 150MHz works fine with
64GB Samsung EVO+ microSD cards
This commit is contained in:
perillamint 2018-04-29 15:48:06 +09:00
parent 01b404c211
commit 0c6a3aae5c
1 changed files with 1 additions and 0 deletions
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1
arch/arm64/boot/dts/nvidia/tegra210-nintendo-switch.dts
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@ -941,6 +941,7 @@
sdhci@700b0000 {
status = "okay";
bus-width = <4>;
max-frequency = <150000000>;
cd-gpios = <&gpio TEGRA_GPIO(Z, 1) GPIO_ACTIVE_LOW>;
power-gpios = <&gpio TEGRA_GPIO(E, 4) GPIO_ACTIVE_HIGH>;