Re: [PATCH] arm64: dts: rockchip: Enable HS400 enhanced strobe on Kobol Helios64 eMMC

[Shawn Lin]

在 2026/10/11 星期日 5:52, Igor Velkov via B4 Relay 写道:
> From: Igor Velkov <iav@xxxxxx>
>
> The eMMC of Helios64 runs in HS200. Run it in HS400 enhanced strobe at
> 150 MHz, as on Gru. The strobe line goes straight from the SoC to the
> DS pin of the eMMC with no pull-down on the board, so enable the one
> in the eMMC PHY.

Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>

> Assisted-by: LLM
> Signed-off-by: Igor Velkov <iav@xxxxxx>
> ---
> Schematic, sheet 14:
> https://wiki.kobol.io/helios64/files/schematics/Helios64_Schematics_Rev1.2.pdf
>
> Tested on mainline with three 2 GiB write and read-back passes, no
> errors. Raw reads go from 180 MB/s in HS200 to 247 MB/s. Without the
> pull-down, writes dropped to about 1 MB/s with repeated
> "mmc1: running CQE recovery".
> ---
>   arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts b/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts
> index 63ad79b4c8ac..f78482c4c285 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts
> +++ b/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts
> @@ -320,6 +320,7 @@ &cpu_l3 {
>   };
>   
>   &emmc_phy {
> +	rockchip,enable-strobe-pulldown;
>   	status = "okay";
>   };
>   
> @@ -586,8 +587,11 @@ &saradc {
>   };
>   
>   &sdhci {
> +	assigned-clock-rates = <150000000>;
>   	bus-width = <8>;
>   	mmc-hs200-1_8v;
> +	mmc-hs400-1_8v;
> +	mmc-hs400-enhanced-strobe;
>   	non-removable;
>   	vqmmc-supply = <&vcc1v8_sys_s0>;
>   	status = "okay";
>
> ---
> base-commit: d2abcbb905b0e4b2e06b257fa1e5bcf4faa6dbda
> change-id: 20261011-b4-helios64-emmc-hs400-9c784f35d8dd
>
> Best regards,