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

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Message-ID: <20201208075815.GC31973@laputa>
Date:   Tue, 8 Dec 2020 16:58:15 +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,

On Thu, Dec 03, 2020 at 11:55:23AM +0200, Adrian Hunter wrote:
> On 1/12/20 5:09 am, AKASHI Takahiro wrote:
> > 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?
> 
> I have made some more comments and that is all for now, except for anything
> more you wish to discuss.

Thank you.
I assume that you don't have any objection against adding extra hooks
to sdhci_ops in patch#23 and #25, do you?

If so, since we don't have any critical issues to discuss,
I hope that my changes will be contained in the new version
where a major rework will be done on the core side by Ben.

-Takahiro Akashi