linux-kernel - Re: [PATCH v2 1/2] riscv: dts: starfive: jh7110-common: increase mmc0 max-frequency

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Message-ID:
 <AM7P189MB100934B6F2EF4339243CB81AE3C62@AM7P189MB1009.EURP189.PROD.OUTLOOK.COM>
Date: Sat, 22 Feb 2025 15:31:49 +0100
From: Maud Spierings <maud_spierings@...mail.com>
To: Shengyu Qu <wiagn233@...look.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: linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, william.qiu@...rfivetech.com
Subject: Re: [PATCH v2 1/2] riscv: dts: starfive: jh7110-common: increase mmc0
 max-frequency


On 2/22/25 3:19 PM, Shengyu Qu wrote:
> Sry I forgot to cc actually.
>
> 在 2025/2/22 22:17, Shengyu Qu 写道:
>> Hi,
>>
>> Let's continue our discussion here.
>>
>> Will EMMC speed increase if we only apply patch 1?
no the speed is further limited by the assigned-clock-rates.
>>
>> Also, about your clock-rates modification in patch 2, I CCed William Qiu
>> so that we might get some more information about this.
thanks!
>>
>> Besides I've done a speed test with unlimitied clock-rates and an early
>> state of SOC clock driver on visionfive 2 when I was working on AXP15060
>> driver before: http://forum.rvspace.org/t/question-about-sd-card- 
>> speed/1741/21
I believe that looks close to the speeds I was getting when testing, 
been while
>>
>> Best regards,
>> Shengyu
>>
>> 在 2025/2/22 21:34, Maud Spierings via B4 Relay 写道:
>>> From: Maud Spierings <maud_spierings@...mail.com>
>>>
>>> This sdio interface is capable of more than 100 MHz as already 
>>> indicated
>>> by the cap_hs200-1_8v attribute. Increase the max-frequency to 200 MHz
>>> so users of this dtsi can increase their SDIO bus speed.
>>>
>>> Signed-off-by: Maud Spierings <maud_spierings@...mail.com>
>>> ---
>>>   arch/riscv/boot/dts/starfive/jh7110-common.dtsi | 2 +-
>>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/arch/riscv/boot/dts/starfive/jh7110-common.dtsi b/arch/ 
>>> riscv/boot/dts/starfive/jh7110-common.dtsi
>>> index 
>>> dd2eefc295e5c8b568a02104ec2189e66b378904..19ca8dc24617c2ad565a4a9b2d9af9bd9491f22e 
>>> 100644
>>> --- a/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
>>> +++ b/arch/riscv/boot/dts/starfive/jh7110-common.dtsi
>>> @@ -258,7 +258,7 @@ &i2c6 {
>>>   };
>>>   &mmc0 {
>>> -    max-frequency = <100000000>;
>>> +    max-frequency = <200000000>;
>>>       assigned-clocks = <&syscrg JH7110_SYSCLK_SDIO0_SDCARD>;
>>>       assigned-clock-rates = <50000000>;
>>>       bus-width = <8>;
>>>
>>
>