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: 11+ 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 6:59 ` Clemens Ladisch
2012-07-31 7:27 ` Karl Beldan
2012-07-31 7:34 ` Clemens Ladisch
2012-07-31 8:30 ` Karl Beldan
2012-07-31 9:09 ` Russell King - ARM Linux
2012-07-31 19:31 ` Karl Beldan
2012-07-31 20:08 ` Russell King - ARM Linux
2012-08-01 6:50 ` Karl Beldan
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