linux-kernel - Re: [PATCH V3 1/3] mmc: sdhci: add support for using external DMA devices

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Date:   Mon, 3 Dec 2018 18:46:33 +0800
From:   Chunyan Zhang <zhang.chunyan@...aro.org>
To:     Faiz Abbas <faiz_abbas@...com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        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>, Lyra Zhang <zhang.lyra@...il.com>
Subject: Re: [PATCH V3 1/3] mmc: sdhci: add support for using external DMA devices

On Mon, 3 Dec 2018 at 17:01, Faiz Abbas <faiz_abbas@...com> wrote:
>
> Hi Chunyan,
>
> On 29/11/18 2:53 PM, Adrian Hunter wrote:
> > On 29/11/18 8:07 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>
> >> ---
> >>  drivers/mmc/host/Kconfig |  14 ++++
> >>  drivers/mmc/host/sdhci.c | 185 ++++++++++++++++++++++++++++++++++++++++++++++-
> >>  drivers/mmc/host/sdhci.h |   8 ++
> >>  3 files changed, 206 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> >> index 1b58739..4183f43 100644
> >> --- a/drivers/mmc/host/Kconfig
> >> +++ b/drivers/mmc/host/Kconfig
> >> @@ -969,6 +969,7 @@ config MMC_SDHCI_XENON
> >>  config MMC_SDHCI_OMAP
> >>      tristate "TI SDHCI Controller Support">>        depends on MMC_SDHCI_PLTFM && OF
> >> +    select MMC_SDHCI_EXTERNAL_DMA if DMA_ENGINE
>
>
> This should be in patch 2.

Ok, will move to.

Thanks,
Chunyan

>
> Thanks,
> Faiz