linux-kernel - Re: [RFC PATCH v3.1 00/27] Add support UHS-II for GL9755

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Date:   Tue, 1 Dec 2020 12:09:37 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     ulf.hansson@...aro.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, ben.chuang@...esyslogic.com.tw,
        greg.tu@...esyslogic.com.tw
Subject: Re: [RFC PATCH v3.1 00/27] Add support UHS-II for GL9755

Adrian,

Thank you for your review comments.

On Thu, Nov 26, 2020 at 10:18:55AM +0200, Adrian Hunter wrote:
> On 25/11/20 9:41 am, AKASHI Takahiro wrote:
> > Gentle ping;
> > 
> > On Fri, Nov 06, 2020 at 11:26:59AM +0900, AKASHI Takahiro wrote:
> >> This is an interim snapshot of our next version, v4, for enabling
> >> UHS-II on MMC/SD.
> >>
> >> It is focused on 'sdhci' side to address Adrian's comments regarding
> >> "modularising" sdhci-uhs2.c.
> >> The whole aim of this version is to get early feedback from Adrian (and
> >> others) on this issue. Without any consensus about the code structure,
> > 
> > Any comments so far?
> > 
> 
> Overall, I like this approach of separating UHS2 from legacy sdhci as much
> as possible.  The only major change, is to drop support for legacy quirks
> and features that you do not need.  The reason for that, is that there may
> be few drivers that end up with UHS-II support (opting instead for SD
> Express), so there is no point going to a lot of trouble to support things
> that never get used.
> 
> From what I have seen that looks like it includes:
> 	- any quirks

GLI driver (gl9755) needs
  * SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC
  * SDHCI_QUIRK2_BROKEN_DDR50
but they are managed in sdhci code.

> 	- SDHCI LED support
> 	- external DMA support

Should we add 'depends on !SDHCI_UHS2' to MMC_SDHCI_EXTERNAL_DMA?

> In this regard, the important thing is to have a comment somewhere that
> lists what is not supported.
> 
> I have only looked at SDHCI patches so far, and only up to about patch 20,
> but maybe that gives you enough to go on for a while.

Well, I have almost done.
Can I expect your comments on the patches #21-#27 as well soon?

-Takahiro Akashi