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@@ -0,0 +1,26 @@
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+From: David Bauer <[email protected]>
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+Subject: arm64: dts: rockchip: disable UHS modes for NanoPi R4S
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+
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+The NanoPi R4S leaves the SD card in 1.8V signalling when rebooting
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+while U-Boot requires the card to be in 3.3V mode.
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+
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+Remove UHS support from the SD controller so the card remains in 3.3V
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+mode. This reduces transfer speeds but ensures a reboot whether from
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+userspace or following a kernel panic is always working.
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+
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+Signed-off-by: David Bauer <[email protected]>
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+
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+--- a/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
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++++ b/arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts
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+@@ -121,6 +121,11 @@
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+ status = "disabled";
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+ };
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+
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++&sdmmc {
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++ /delete-property/ sd-uhs-sdr104;
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++ cap-sd-highspeed;
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++};
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++
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+ &u2phy0_host {
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+ phy-supply = <&vdd_5v>;
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+ };
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David Bauer