linux-kernel - Re: [PATCH] riscv: dts: starfive: fml13v01: increase eMMC bus speed

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Message-ID:
 <TYCPR01MB84379C13A329703421086FF298C62@TYCPR01MB8437.jpnprd01.prod.outlook.com>
Date: Sat, 22 Feb 2025 20:54:17 +0800
From: Shengyu Qu <wiagn233@...look.com>
To: maud_spierings@...mail.com, Conor Dooley <conor@...nel.org>,
 Emil Renner Berthing <kernel@...il.dk>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Alexandre Ghiti <alex@...ti.fr>
Cc: wiagn233@...look.com, linux-riscv@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: dts: starfive: fml13v01: increase eMMC bus speed

Hi,

The clock speed limit here seems because of some clock HW issues:
https://github.com/torvalds/linux/commit/af571133f7ae028ec9b5fdab78f483af13bf28d3

Maybe we need some assist from Starfive guys?

Best regards,
Shengyu


在 2025/2/15 17:46, Maud Spierings via B4 Relay 写道:
> From: Maud Spierings <maud_spierings@...mail.com>
> 
> The assigned clock speed of 50 MHz is and max-frequency of 100MHz are
> limitting this interface which is SDIO 5.0 capable. Sadly at 200MHz it
> fails to mount an eMMC drive, 150MHz (really 132 MHz) is the highest it
> was able to get.
> 
> This improves the seq read/write performance by 2x~
> 
> Signed-off-by: Maud Spierings <maud_spierings@...mail.com>
> ---
> I put this in this specific dts instead of the common one as I cannot
> test if other boards are also able to handle these speeds.
> 
> This patch depends on [1]
> 
> [1]: https://lore.kernel.org/all/20250207093618.126636-1-sandie.cao@deepcomputing.io/
> ---
>   arch/riscv/boot/dts/starfive/jh7110-deepcomputing-fml13v01.dts | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> 
> ---
> base-commit: 0bc08ec1ff5a32449d2b04704173dbf3ebd6b014
> change-id: 20250215-fml13v01_emmc_speed-67812bd9b404
> 
> Best regards,
> 
> diff --git a/arch/riscv/boot/dts/starfive/jh7110-deepcomputing-fml13v01.dts b/arch/riscv/boot/dts/starfive/jh7110-deepcomputing-fml13v01.dts
> index 8d9ce8b69a71be78ca57618ae842c9f415648450..1f4bac9f89463a6af844b8f1743bdfa659e612ab 100644
> --- a/arch/riscv/boot/dts/starfive/jh7110-deepcomputing-fml13v01.dts
> +++ b/arch/riscv/boot/dts/starfive/jh7110-deepcomputing-fml13v01.dts
> @@ -11,6 +11,11 @@ / {
>   	compatible = "deepcomputing,fml13v01", "starfive,jh7110";
>   };
>   
> +&mmc0 {
> +	max-frequency = <200000000>;
> +	assigned-clock-rates = <150000000>;
> +};
> +
>   &pcie1 {
>   	perst-gpios = <&sysgpio 21 GPIO_ACTIVE_LOW>;
>   	phys = <&pciephy1>;


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