From: Wolfram Sang <wsa@the-dreams.de>
To: "Niklas Söderlund" <niklas.soderlund+renesas@ragnatech.se>
Cc: linux-i2c@vger.kernel.org, linux-renesas-soc@vger.kernel.org,
devicetree@vger.kernel.org
Subject: Re: [PATCHv2] i2c: rcar: add DMA support
Date: Sun, 15 May 2016 08:52:04 +0200 [thread overview]
Message-ID: <20160515065204.GA1846@katana> (raw)
In-Reply-To: <1463228228-32560-1-git-send-email-niklas.soderlund+renesas@ragnatech.se>
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On Sat, May 14, 2016 at 02:17:08PM +0200, Niklas Söderlund wrote:
> Make it possible to transfer i2c message buffers via DMA.
> Start/Stop/Sending_Slave_Address and some data is still handled using
> the old state machine, it is sending the bulk of the data that is done
> via DMA.
>
> The first byte of a transmission and the last two bytes of reception are
> sent/received using PIO. This is needed for the HW to have access to the
> first byte before DMA transmit and to be able to set the STOP condition
> for DMA reception.
>
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Fixed a checkpatch warning (trailing */) and applied to for-next,
thanks!
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next prev parent reply other threads:[~2016-05-15 6:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-14 12:17 [PATCHv2] i2c: rcar: add DMA support Niklas Söderlund
2016-05-15 6:52 ` Wolfram Sang [this message]
2016-05-18 13:23 ` Arnd Bergmann
2016-05-19 8:01 ` Niklas Söderlund
2016-05-19 8:09 ` Wolfram Sang
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