linux-kernel - Re: [PATCH v2 8/8] arm64: dts: rockchip: Enable SD-card interface on Radxa E20C

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Message-ID: <Z8qfn-OTgopD8YMO@pie>
Date: Fri, 7 Mar 2025 07:26:23 +0000
From: Yao Zi <ziyao@...root.org>
To: Chukun Pan <amadeus@....edu.cn>, jonas@...boo.se
Cc: conor+dt@...nel.org, cristian.ciocaltea@...labora.com,
	detlev.casanova@...labora.com, devicetree@...r.kernel.org,
	heiko@...ech.de, krzk+dt@...nel.org,
	linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2 8/8] arm64: dts: rockchip: Enable SD-card interface on
 Radxa E20C

On Fri, Mar 07, 2025 at 03:10:20PM +0800, Chukun Pan wrote:
> Hi,
> 
> > On the E20C the sdmmc controller is routed to a microSD card slot mainly
> > intended for use with microSD-cards and should normally not need SDIO.
> > 
> > What card/adapter do you have inserted in the microSD card slot that
> > requires use of SDIO instead of just SD or MMC? What is the use case you
> > have that requires removal of no-sdio on E20C?
> 
> I inserted an sdio wifi module (via sdcard adapter) for testing.
> Just out of curiosity :)

I doubt whether the module actually works, they usually require more
pins than a simple SDIO bus to function. Additionally, it really doesn't
sound like a real use case for me.

Have you tried transferring some data? The log you showed only indicates
the controller doesn't bail out or freeze when encountering SDIO command
sequences during initialization, but cannot prove the controller is
really in a good state and could transfer as normal.

Again, connecting SDIO WiFi modules to a SDcard slot doesn't seem an
usual case for me. I'll change my mind to keep SDIO sequence disabled if
you didn't get the module really working but only observed the
initialization didn't fail,

> Thanks,
> Chukun
> 
> -- 
> 2.25.1
> 

Best regards,
Yao Zi