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>
[-- Attachment #1: Type: text/plain, Size: 763 bytes --]
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!
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
next prev parent reply other threads:[~2016-05-15 6:52 UTC|newest]
Thread overview: 7+ 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
2016-05-18 13:23 ` Arnd Bergmann
2016-05-19 8:01 ` Niklas Söderlund
2016-05-19 8:01 ` Niklas Söderlund
2016-05-19 8:09 ` Wolfram Sang
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20160515065204.GA1846@katana \
--to=wsa@the-dreams.de \
--cc=devicetree@vger.kernel.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-renesas-soc@vger.kernel.org \
--cc=niklas.soderlund+renesas@ragnatech.se \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.