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arm64: dts: rockchip: Lower SD card speed on rk3399 Pinebook Pro

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MicroSD card slot in the Pinebook Pro is located on a separate
daughterboard that's connected to the mainboard using a rather
long flat cable.  The resulting signal degradation causes many
perfectly fine microSD cards not to work in the Pinebook Pro,
which is a common source of frustration among the owners.

Changing the mode and lowering the speed reportedly fixes this
issue and makes many microSD cards work as expected.

Co-developed-by: Dragan Simic <dragan.simic@gmail.com>
Signed-off-by: Dragan Simic <dragan.simic@gmail.com>
Tested-by: JR Gonzalez <jrg@scientiam.org>
Signed-off-by: Dan Johansen <strit@manjaro.org>
Link: https://lore.kernel.org/r/20230305104730.15849-1-strit@manjaro.org
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
This commit is contained in:
Dan Johansen 2023-03-05 11:47:31 +01:00 committed by Heiko Stuebner
parent 5912b647bd
commit 78aedee18a
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
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@ -943,7 +943,7 @@ &sdmmc {
disable-wp;
pinctrl-names = "default";
pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_bus4>;
sd-uhs-sdr104;
sd-uhs-sdr50;
vmmc-supply = <&vcc3v0_sd>;
vqmmc-supply = <&vcc_sdio>;
status = "okay";