From: karl.beldan@gmail.com
To: linux-kernel@vger.kernel.org
Cc: karl.beldan@gmail.com
Subject: Re: About dma_sync_single_for_{cpu,device}
Date: Mon, 30 Jul 2012 22:34:32 +0200 [thread overview]
Message-ID: <20120730203412.GA5311@gobelin> (raw)
In-Reply-To: <20120730202401.GA4947@gobelin>
On Mon, Jul 30, 2012 at 10:24:01PM +0200, karl.beldan@gmail.com wrote:
> I was expecting the following to work:
> addr = dma_map_single(dev, buffer, size, DMA_TO_DEVICE);
Sorry, I forgot this (invalidate):
dma_sync_single_for_device(dev, buffer, pattern_size, DMA_FROM_DEVICE);
> dev_send(buffer);
> // wait for irq (don't peek in the buffer) ... got irq
> dma_sync_single_single_for_cpu(dev, buffer, pattern_size, DMA_FROM_DEVICE);
> if (!xfer_done(buffer)) // not RAM value
> dma_sync_single_for_device(dev, buffer, pattern_size, DMA_FROM_DEVICE);
> [...]
Karl
next prev parent reply other threads:[~2012-07-30 20:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-30 20:24 About dma_sync_single_for_{cpu,device} karl.beldan
2012-07-30 20:34 ` karl.beldan [this message]
2012-07-31 6:45 ` Karl Beldan
2012-07-31 6:45 ` Karl Beldan
2012-07-31 6:59 ` Clemens Ladisch
2012-07-31 6:59 ` Clemens Ladisch
2012-07-31 7:27 ` Karl Beldan
2012-07-31 7:27 ` Karl Beldan
2012-07-31 7:34 ` Clemens Ladisch
2012-07-31 7:34 ` Clemens Ladisch
2012-07-31 8:30 ` Karl Beldan
2012-07-31 8:30 ` Karl Beldan
2012-07-31 9:09 ` Russell King - ARM Linux
2012-07-31 9:09 ` Russell King - ARM Linux
2012-07-31 19:31 ` Karl Beldan
2012-07-31 19:31 ` Karl Beldan
2012-07-31 20:08 ` Russell King - ARM Linux
2012-07-31 20:08 ` Russell King - ARM Linux
2012-08-01 6:50 ` Karl Beldan
2012-08-01 6:50 ` Karl Beldan
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=20120730203412.GA5311@gobelin \
--to=karl.beldan@gmail.com \
--cc=linux-kernel@vger.kernel.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 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.