[PATCH] arm64: dts: rockchip: fix eMMC corruption on NanoPC-T6 with A3A444 chips

[Tianling Shen]

+ Jianfeng

On 2025/10/20 12:44, Tianling Shen wrote:
> Hi Shawn,
> 
> On 2025/10/20 9:53, Shawn Lin wrote:
>> Hi Tianling
>>
>> On 2025/10/17 Friday 15:39, Tianling Shen wrote:
>>> From: Grzegorz Sterniczuk <grzegorz at sternicz.uk>
>>>
>>> Some NanoPC-T6 boards with A3A444 eMMC chips experience I/O errors and
>>> corruption when using HS400 mode. Downgrade to HS200 mode to ensure
>>> stable operation.
>>
>> May I ask you to test another patch I just posted to see if it fixes
>> your issue?
>>
>> https://patchwork.kernel.org/project/linux-mmc/ 
>> patch/1760924981-52339-1- git-send-email-shawn.lin at rock-chips.com/
> 
> Thank you for the patch! I will ask my friend to test it but he uses 
> this board as a home router, so it may take a few days or weeks to 
> report the result.

Hi all, sorry for the late. My friend has tested this patch and it works 
fine after 50 times dd operation. A big thanks to Shawn!

And hi Jianfeng, I found you made a similiar patch[1] for the ROCK 5 ITX 
board to lower down the mmc speed, could you please check if this patch 
also fixes your issue?

Thanks,
Tianling.

1. 
https://lore.kernel.org/linux-rockchip/20250228143341.70244-1-liujianfeng1994@gmail.com/

> 
> Thanks,
> Tianling.
> 
>>
>>
>>>
>>> Signed-off-by: Grzegorz Sterniczuk <grzegorz at sternicz.uk>
>>> Signed-off-by: Tianling Shen <cnsztl at gmail.com>
>>> ---
>>>   arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi | 3 +--
>>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>>
>>> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi b/ 
>>> arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
>>> index fafeabe9adf9..5f63f38f7326 100644
>>> --- a/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
>>> +++ b/arch/arm64/boot/dts/rockchip/rk3588-nanopc-t6.dtsi
>>> @@ -717,8 +717,7 @@ &sdhci {
>>>       no-sd;
>>>       non-removable;
>>>       max-frequency = <200000000>;
>>> -    mmc-hs400-1_8v;
>>> -    mmc-hs400-enhanced-strobe;
>>> +    mmc-hs200-1_8v;
>>>       status = "okay";
>>>   };
>>
>