From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [Linaro-mm-sig] [PATCH 0/2] Device Tree support for CMA (Contiguous Memory Allocator) Date: Mon, 18 Feb 2013 15:58:26 -0600 Message-ID: <5122A402.7030807@gmail.com> References: <1360845928-8107-1-git-send-email-m.szyprowski@samsung.com> <20130214213013.GG1906@pengutronix.de> <511D6076.9090503@gmail.com> <20130215083304.GK1906@pengutronix.de> <511E6143.609@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: 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: Nishanth Peethambaran Cc: Sascha Hauer , Michal Nazarewicz , linaro-mm-sig-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, Kyungmin Park , Sylwester Nawrocki , devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: devicetree@vger.kernel.org On 02/16/2013 11:18 PM, Nishanth Peethambaran wrote: > Limiting the scope of the product to a particular use-case (720p or > 1080p video playback) will be part of firmware mostly OTP-ed in the > SoC. Firmware author could decide the amount of CMA memory needed and > put this as part of DT. What kernel developer would want a firmware author deciding how much memory is needed? It is not a decision that can be made without knowledge of the OS. While the frame size could be determined easily enough based on resolution, the number of buffers needed cannot. Rob