[PATCH] arm64: dts: rockchip: Lower sd speed on soquartz

[Peter Geis]

On Sat, Mar 4, 2023 at 11:42 AM Dan Johansen <strit at manjaro.org> wrote:
>
> Just like the Quartz64 Model B the previously stated speed of sdr-104
> in soquartz is too high for the hardware to reliably communicate with
> some fast SD cards.
> Especially on some carrierboards.
>
> Lower this to sd-uhs-sdr50 to fix this.
>
> Fixes: 5859b5a9c3ac ("arm64: dts: rockchip: add SoQuartz CM4IO dts")
>
> Signed-off-by: Dan Johansen <strit at manjaro.org>

Makes sense, considering the problems we're having with other boards.
We should probably stop using sdr104 altogether on Rockchip, at least
until they release a chip that improves on the limitations of pinctrl
speed. Considering the frequency cap it isn't that much of a hit.

Acked-by: Peter Geis <pgwipeout at gmail.com>

> ---
>  arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi b/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi
> index ce7165d7f1a1..102e448bc026 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3566-soquartz.dtsi
> @@ -598,7 +598,7 @@ &sdmmc1 {
>         non-removable;
>         pinctrl-names = "default";
>         pinctrl-0 = <&sdmmc1_bus4 &sdmmc1_cmd &sdmmc1_clk>;
> -       sd-uhs-sdr104;
> +       sd-uhs-sdr50;
>         vmmc-supply = <&vcc3v3_sys>;
>         vqmmc-supply = <&vcc_1v8>;
>         status = "okay";
> --
> 2.39.2
>
>
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