linux-kernel - 答复: [PATCH] [V2] mmc: rtsx: Add SD Express mode support for RTS5261

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Message-ID: <2A308283684ECD4B896628E09AF5361E59ACF71F@RS-MBS01.realsil.com.cn>
Date:   Mon, 25 May 2020 10:11:44 +0000
From:   冯锐 <rui_feng@...lsil.com.cn>
To:     Arnd Bergmann <arnd@...db.de>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 答复: [PATCH] [V2] mmc: rtsx: Add SD Express mode support for RTS5261

> On Mon, May 25, 2020 at 8:58 AM 冯锐 <rui_feng@...lsil.com.cn> wrote:
> > > On Fri, May 22, 2020 at 11:16 AM Greg KH <gregkh@...uxfoundation.org>
> wrote:
> > > >
> > > > If I can get an ack from the MMC maintainer, I can take this in my
> > > > tree...
> > > >
> > > > {hint}
> > >
> > > I think this feature needs much more discussion to make sure we get
> > > a good user experience when it gets added to all mmc controllers.
> > >
> > Only RTS5261 is affected by this patch. Other vendor's reader won't be
> affected.
> 
> That sounds like another problem with this patch:
> 
> The transition should probably be handled by the MMC core checking whether
> the kernel, the mmc host and and the card all support SD express mode, and
> then start the transition as well as falling back to SD mode if it doesn't come up
> properly.
> 
The purpose of the modification in mmc core of this patch is to let the kernel has the ability
to check whether the card support SD express mode according to SD specification.
If RTS5261 switch to SD express mode failed, RTS5261 will fall back to SD mode by itself
and It doesn't need mmc driver to do anything. After falling back to SD mode, mmc driver
will handle the SD card in SD mode as before without this patch.

Kind regards