From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755113Ab2G3Ucq (ORCPT ); Mon, 30 Jul 2012 16:32:46 -0400 Received: from mail-we0-f174.google.com ([74.125.82.174]:55000 "EHLO mail-we0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754890Ab2G3Uco (ORCPT ); Mon, 30 Jul 2012 16:32:44 -0400 Date: Mon, 30 Jul 2012 22:34:32 +0200 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} Message-ID: <20120730203412.GA5311@gobelin> References: <20120730202401.GA4947@gobelin> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20120730202401.GA4947@gobelin> X-Location: France User-Agent: Mutt (Linux 3.5.0-07078-gf7da9cd-dirty x86_64 GNU/Linux) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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