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From: Christoph Hellwig <hch@infradead.org>
To: rui_feng@realsil.com.cn
Cc: arnd@arndb.de, gregkh@linuxfoundation.org,
	ulf.hansson@linaro.org, linux-kernel@vger.kernel.org,
	linux-pci@vger.kernel.org
Subject: Re: [PATCH] mmc: rtsx: Add SD Express mode support for RTS5261
Date: Sun, 26 Apr 2020 23:14:26 -0700	[thread overview]
Message-ID: <20200427061426.GA11270@infradead.org> (raw)
In-Reply-To: <1587864346-3144-1-git-send-email-rui_feng@realsil.com.cn>

On Sun, Apr 26, 2020 at 09:25:46AM +0800, rui_feng@realsil.com.cn wrote:
> From: Rui Feng <rui_feng@realsil.com.cn>
> 
> RTS5261 support legacy SD mode and SD Express mode.
> In SD7.x, SD association introduce SD Express as a new mode.
> SD Express mode is distinguished by CMD8.
> Therefore, CMD8 has new bit for SD Express.
> SD Express is based on PCIe/NVMe.
> RTS5261 uses CMD8 to switch to SD Express mode.

So how does this bit work?  They way I imagined SD Express to work
is that the actual SD Card just shows up as a real PCIe device, similar
to say Thunderbolt.

       reply	other threads:[~2020-04-27  6:14 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1587864346-3144-1-git-send-email-rui_feng@realsil.com.cn>
2020-04-27  6:14 ` Christoph Hellwig [this message]
2020-04-27  9:40   ` 答复: [PATCH] mmc: rtsx: Add SD Express mode support for RTS5261 冯锐
2020-04-27 11:07     ` Arnd Bergmann
2020-04-28  3:44       ` 答复: " 冯锐
2020-05-05 18:18         ` Ulf Hansson
2020-05-19  9:17           ` 答复: " 冯锐
2020-05-25 10:27             ` Ulf Hansson
2020-06-01  7:33               ` 答复: " 冯锐
2020-06-01 10:19                 ` Ulf Hansson
2020-06-02  2:41                   ` 答复: " 冯锐
2020-06-02  8:36                     ` Ulf Hansson
2020-06-02  9:15                       ` 答复: " 冯锐
2020-07-01  9:52                       ` 冯锐
2020-07-06 14:42                         ` Ulf Hansson

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