linux-kernel - Re: About dma_sync_single_for

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Message-ID: <20120730203412.GA5311@gobelin>
Date:	Mon, 30 Jul 2012 22:34:32 +0200
From:	karl.beldan@...il.com
To:	linux-kernel@...r.kernel.org
Cc:	karl.beldan@...il.com
Subject: Re: About dma_sync_single_for_{cpu,device}

On Mon, Jul 30, 2012 at 10:24:01PM +0200, karl.beldan@...il.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
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