linux-kernel - Re: [PATCH V4 1/3] mmc: sdhci: add support for using external DMA devices

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Message-ID: <CAAfSe-tHu5m3Of6=KBCxBBH1T8=4tgN8aZP_7QaGERctECZPoQ@mail.gmail.com>
Date:   Thu, 27 Dec 2018 16:02:59 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Chunyan Zhang <zhang.chunyan@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Faiz Abbas <faiz_abbas@...com>, linux-mmc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Sekhar Nori <nsekhar@...com>
Subject: Re: [PATCH V4 1/3] mmc: sdhci: add support for using external DMA devices

On Thu, 27 Dec 2018 at 15:44, Adrian Hunter <adrian.hunter@...el.com> wrote:
>
> On 11/12/18 11:12 AM, Chunyan Zhang wrote:
> > Some standard SD host controllers can support both external dma
> > controllers as well as ADMA/SDMA in which the SD host controller
> > acts as DMA master. TI's omap controller is the case as an example.
> >
> > Currently the generic SDHCI code supports ADMA/SDMA integrated in
> > the host controller but does not have any support for external DMA
> > controllers implemented using dmaengine, meaning that custom code is
> > needed for any systems that use an external DMA controller with SDHCI.
> >
> > Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
>
> FYI, I am waiting on successful testing before reviewing these patches again.

Yeah, that makes sense, thanks Adrian!

I intend to send out another new patchset after the holidays.
After had another look at omap_hsmmc, I knew something need to be
modified (emailed Faiz about this privately), but I was still not sure
if it can fix the problem Faiz found.

Happy new year to all,
Chunyan