From: Quentin Schulz quentin.schulz@theobroma-systems.com
From: Jakob Unterwurzacher jakob.unterwurzacher@theobroma-systems.com
CRC errors (code -84 EILSEQ) have been observed for some SanDisk Ultra A1 cards when running at 50MHz.
Waveform analysis suggest that the level shifters that are used on the RK3399-Q7 module for voltage translation between 3.0 and 3.3V don't handle clock rates at or above 48MHz properly. Back off to 40MHz for some safety margin.
Cc: stable@vger.kernel.org Fixes: 60fd9f72ce8a ("arm64: dts: rockchip: add Haikou baseboard with RK3399-Q7 SoM") Signed-off-by: Jakob Unterwurzacher jakob.unterwurzacher@theobroma-systems.com Signed-off-by: Quentin Schulz quentin.schulz@theobroma-systems.com --- We've been carrying this patch downstream for years and completely forgot to upstream it. This is now done.
To: Rob Herring robh+dt@kernel.org To: Krzysztof Kozlowski krzysztof.kozlowski+dt@linaro.org To: Heiko Stuebner heiko@sntech.de Cc: devicetree@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-rockchip@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: Jakob Unterwurzacher jakob.unterwurzacher@theobroma-systems.com --- arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts index 04c752f49be9..115c14c0a3c6 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma-haikou.dts @@ -207,7 +207,7 @@ &sdmmc { cap-sd-highspeed; cd-gpios = <&gpio0 RK_PA7 GPIO_ACTIVE_LOW>; disable-wp; - max-frequency = <150000000>; + max-frequency = <40000000>; pinctrl-names = "default"; pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_cd &sdmmc_bus4>; vmmc-supply = <&vcc3v3_baseboard>;
--- base-commit: aae703b02f92bde9264366c545e87cec451de471 change-id: 20221019-upstream-puma-sd-40mhz-b5aef1c351e6
Best regards,