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

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Message-Id: <20250115020006.10336-1-amadeus@jmu.edu.cn>
Date: Wed, 15 Jan 2025 10:00:06 +0800
From: Chukun Pan <amadeus@....edu.cn>
To: jonas@...boo.se
Cc: amadeus@....edu.cn,
	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,
	naoki@...xa.com
Subject: Re: [PATCH 1/1] arm64: dts: rockchip: default to host mode for USB on Radxa E25

Hi,
> 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.

This problem seems to occur only on rk356x?

> 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.

It seems that sd-uhs-sdr50 does not need 1.8V IO voltage.
I tested the speed on a rk3528 board with sdio wifi:
(The IO voltage of sdio on this board is 3.3V)

highspeed: 170Mbps DL
sdr50:     290Mbps DL
sdr104:    290Mbps DL

So sdr50 should be safe.

Thanks,
Chukun

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