From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Gerhard Pircher" Subject: Re: RFC: dma_mmap_coherent() for powerpc/ppc architecture and ALSA? Date: Mon, 12 Jun 2006 16:42:54 +0200 Message-ID: <20060612144254.305930@gmx.net> References: <20060610082223.321730@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@lists.sourceforge.net Errors-To: alsa-devel-bounces@lists.sourceforge.net To: Takashi Iwai Cc: linuxppc-dev@ozlabs.org, rlrevell@joe-job.com, alsa-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, benh@kernel.crashing.org List-Id: alsa-devel@alsa-project.org > -------- Original-Nachricht -------- > Datum: Mon, 12 Jun 2006 12:51:16 +0200 > Von: Takashi Iwai > An: Gerhard Pircher > Betreff: Re: RFC: dma_mmap_coherent() for powerpc/ppc architecture and > ALSA? > = > > Well, implementing the dma_mmap_coherent() function isn't the > > problem, because it is already implemented for the ARM > > architecture. > = > Actually, I wrote dma_coherent_mmap patch long time ago but it has > been left forgotten. The patch attached below seems applicable to > 2.6.17 tree, but I'm not sure whether it still works properly. > It's untested on most of architectures. Thanks, that helps me a lot! > > But as far as I understand this would require a rewrite of all the > > ALSA drivers (or at least a rewrite of the ALSA's DMA helper > > functions). > = > Yes. The change of ALSA side has been also on my tree. But it was > still pending since I'm not satisfied with the design yet. > If you're interested in it, let me know. I'll post the patch. Yes, please! Then I can test, if the dma_mmap_coherent() patch works on my non cache coherent powerpc machine. Do you think the DMA Layer/ALSA patc= hes will go upstream in one of the next ALSA/Linux kernel versions? Thanks! Gerhard -- = Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen! Ideal f=FCr Modem und ISDN: http://www.gmx.net/de/go/smartsurfer