From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Date: Tue, 07 Jan 2014 23:59:51 +0000 Subject: Re: [PATCH 1/2] ARM: omapfb: add coherent dma memory support Message-Id: <20140107235951.GH5074@atomide.com> List-Id: References: <1388409550-10720-1-git-send-email-tomi.valkeinen@ti.com> <1388409550-10720-2-git-send-email-tomi.valkeinen@ti.com> In-Reply-To: <1388409550-10720-2-git-send-email-tomi.valkeinen@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-arm-kernel@lists.infradead.org * Tomi Valkeinen [131230 05:21]: > The omapfb driver uses dma_alloc to reserve memory for the framebuffers. > However, on some use cases, even when CMA is in use, it's quite probable > that omapfb fails to allocate the fb, either due to not enough free dma > memory, fragmented dma memory, or CMA failing to make enough contiguous > space. > > This patch adds a kernel cmdline parameter 'omapfb_vram' which can be > used to give the size of a memory area reserved exclusively for omapfb, > and optionally a physical address where the memory area is reserved. > > The memory area is reserved with memblock, and assigned to omapfb with > dma_declare_coherent_memory. The dma_alloc function will first try to > allocate the fb from the coherent memory area, and if that fails, it'll > use the normal method of allocation. > > Signed-off-by: Tomi Valkeinen > Cc: Ivaylo Dimitrov Feel free to queue this along with the DSS patches: Acked-by: Tony Lindgren