linux-kernel - Re: [PATCH V10 3/4] mmc: sdhci: Add ADMA3 DMA support for V4 enabled host

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Message-ID: <20190123091532.GB24072@ulmo>
Date:   Wed, 23 Jan 2019 10:15:32 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>
Cc:     robh+dt@...nel.org, mark.rutland@....com, mperttunen@...dia.com,
        chunyan.zhang@...soc.com, jonathanh@...dia.com,
        adrian.hunter@...el.com, ulf.hansson@...aro.org, anrao@...dia.com,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH V10 3/4] mmc: sdhci: Add ADMA3 DMA support for V4 enabled
 host

On Tue, Jan 22, 2019 at 11:56:32AM -0800, Sowjanya Komatineni wrote:
> Below are the supported DMA types in Host Control1 Register
> with Version 4 enable
> b'00 - SDMA
> b'01 - Not Used
> b'10 - ADMA2
> b'11 - ADMA2 or ADMA3
> 
> ADMA3 uses Command Descriptor to issue an SD command.
> A multi-block data transfer is performed by using a pair of CMD
> descriptor and ADMA2 descriptor.
> 
> ADMA3 performs multiple of multi-block data transfer by using
> Integrated Descriptor which is more suitable for Command Queuing
> to fetch both Command and Transfer descriptors.
> 
> Host Capabilities register indiactes the supports of ADMA3 DMA.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
> ---
>  [V10]: Changes are same as V9 except this series has SDHCI core changes
> 	into seperate patch 
> 
>  drivers/mmc/host/sdhci.c | 9 ++++++++-
>  drivers/mmc/host/sdhci.h | 2 ++
>  2 files changed, 10 insertions(+), 1 deletion(-)

Reviewed-by: Thierry Reding <treding@...dia.com>

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