From: broonie@kernel.org (Mark Brown)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] spi: sun4i: add DMA support
Date: Fri, 18 Mar 2016 20:33:52 +0000 [thread overview]
Message-ID: <20160318203352.GL2566@sirena.org.uk> (raw)
In-Reply-To: <20160318202310.GS30977@lukather>
On Fri, Mar 18, 2016 at 09:23:10PM +0100, Maxime Ripard wrote:
> On Thu, Mar 17, 2016 at 12:54:08PM +0100, Michal Suchanek wrote:
> > Very few device drivers would work with 63byte transfers only and the
> > code for manually driving the CS line in case the DMA engine fails to
> > configure will necessarily go untested most of the time since most
> > systems will have DMA configured properly.
> That's not true. A significant portion would work. I don't like to
> make up numbers, but I guess only the EEPROMs and rather big screens
> wouldn't work.
You'll probably also see devices doing things like firmware downloads,
there's a bunch of applications for larger transfers. Like you say it's
definitely not going to be a universal problem though, there's many
devices that just use SPI for fast register access.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 473 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20160318/362e88e2/attachment.sig>
next prev parent reply other threads:[~2016-03-18 20:33 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-26 5:56 [PATCH RESEND 0/2] spi: sun4i: add DMA support Priit Laes
2016-02-26 5:56 ` [PATCH 1/2] " Priit Laes
2016-02-26 12:25 ` Mark Brown
2016-02-26 12:51 ` Michal Suchanek
2016-03-06 21:42 ` Maxime Ripard
2016-03-10 9:01 ` Michal Suchanek
2016-03-17 7:27 ` Maxime Ripard
2016-03-17 10:58 ` Michal Suchanek
2016-03-17 11:43 ` Mark Brown
2016-03-17 11:54 ` Michal Suchanek
2016-03-17 11:58 ` Mark Brown
2016-03-18 20:23 ` Maxime Ripard
2016-03-18 20:33 ` Mark Brown [this message]
2016-02-26 5:56 ` [PATCH 2/2] ARM: sunxi: spi: add notice about SPI FIFO limit Priit Laes
2016-03-06 18:12 ` Maxime Ripard
2016-02-26 12:15 ` [PATCH RESEND 0/2] spi: sun4i: add DMA support Mark Brown
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=20160318203352.GL2566@sirena.org.uk \
--to=broonie@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox