linux-kernel - Re: [PATCH 1/1] arm64: dts: rockchip: default to host mode for USB on Radxa E25

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Message-ID: <d7b2e993-c6c8-4e60-bfe2-80857ca8a992@kwiboo.se>
Date: Mon, 23 Dec 2024 11:50:24 +0100
From: Jonas Karlman <jonas@...boo.se>
To: Chukun Pan <amadeus@....edu.cn>, naoki@...xa.com
Cc: conor+dt@...nel.org, devicetree@...r.kernel.org, heiko@...ech.de,
 krzk+dt@...nel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 1/1] arm64: dts: rockchip: default to host mode for USB on
 Radxa E25

On 2024-12-23 04:00, Chukun Pan wrote:
> Hi,
>> I've been using the uSD card for a long time as a bootloader only,
>> so I don't know what the problem is.
>>
>> Do you have any information on how to reproduce the problem?
>>
>> Best regards,
> 
> Not stable on openwrt/lede, sometimes falling to sd-highspeed.
> Maybe it would be better to switch to sd-uhs-sdr50 mode.

I would advise against using any sd-uhs- mode for sd-card on Rockchip
RK356x boards because of a timing issue during boot between mmc,
regulator and IO-domain drivers.

Any board that support changing between 1v8 or 3v3 io-voltage for the
sd-card is possible affected.

There is a race condition during boot and when IO-domain driver has not
been probed before UHS tuning is started the tuning is done using a 3v3
IO-domain configuration instead of 1v8.

This can typically be seen by comparing UHS tuning during boot and when
same sd-card is removed and re-inserted after boot.

Ideally this race condition should be solved instead of limiting use
of UHS modes. However, use of sd-uhs-sdr50 is typically more forgiving
and has been used on other boards.

Regards,
Jonas

> 
> Thanks,
> Chukun
>