From mboxrd@z Thu Jan 1 00:00:00 1970 From: Krzysztof Halasa Subject: Re: [PATCH 2/5] arm: mvebu: Select DMA_BOUNCE when LPAE is selected in Kconfig Date: Sat, 23 Mar 2013 20:48:16 +0100 Message-ID: References: <1363883179-1361-1-git-send-email-gregory.clement@free-electrons.com> <1363883179-1361-3-git-send-email-gregory.clement@free-electrons.com> <20130322113251.GB4977@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20130322113251.GB4977-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> (Russell King's message of "Fri, 22 Mar 2013 11:32:51 +0000") List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: devicetree-discuss-bounces+gldd-devicetree-discuss=m.gmane.org-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org Sender: "devicetree-discuss" To: Russell King - ARM Linux Cc: Lior Amsalem , Andrew Lunn , Ike Pan , David Marlin , Yehuda Yitschak , Tawfik Bayouk , Dan Frazier , Eran Ben-Avi , Leif Lindholm , Sebastian Hesselbarth , Jason Cooper , Jon Masters , devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, Rob Herring , ll.com-mnsaURCQ41sdnm+yROfE0A@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Chris Van Hoof , Nadav Haklai , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Maen Suleiman , Shadi Ammouri List-Id: devicetree@vger.kernel.org Russell King - ARM Linux writes: > Oh god no. Please move away from the addition on DMABOUNCE - that code > creaks, doesn't have highmem support, and is known to give problems on > various platforms. > > Instead, please rely on using the DMA mask and such like, just like on > x86. It still needs some sort of bouncing (for data passed to the device from upper levels). I wonder if swiotlb doesn't do the same thing. -- Krzysztof Halasa