[PATCH v2] arm64: dts: rockchip: Lower SD card speed on

Dan Johansen strit at manjaro.org
Sun Mar 5 02:47:31 PST 2023

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 at gmail.com>
Signed-off-by: Dragan Simic <dragan.simic at gmail.com>
Tested-by: JR Gonzalez <jrg at scientiam.org>
Signed-off-by: Dan Johansen <strit at manjaro.org>
Changes since v1:
  Use correct Co-developed-by and add missing Signed-off-by.

 arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
index 194e48c755f6..54bb0398128f 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinebook-pro.dts
@@ -943,7 +943,7 @@ &sdmmc {
 	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";

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