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From: 冯锐 <rui_feng@realsil.com.cn>
To: Christoph Hellwig <hch@infradead.org>
Cc: "arnd@arndb.de" <arnd@arndb.de>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"ulf.hansson@linaro.org" <ulf.hansson@linaro.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: 答复: [PATCH] mmc: rtsx: Add SD Express mode support for RTS5261
Date: Mon, 27 Apr 2020 09:40:48 +0000	[thread overview]
Message-ID: <2A308283684ECD4B896628E09AF5361E028BCA26@RS-MBS01.realsil.com.cn> (raw)
In-Reply-To: <20200427061426.GA11270@infradead.org>


> 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.

New SD Express card has dual mode. One is SD mode and another is PCIe mode.
In PCIe mode, it act as a PCIe device and use PCIe protocol not Thunderbolt protocol.

  reply	other threads:[~2020-04-27  9:41 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 ` [PATCH] mmc: rtsx: Add SD Express mode support for RTS5261 Christoph Hellwig
2020-04-27  9:40   ` 冯锐 [this message]
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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