From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Sin Subject: Re: [PATCH 0/9] TI DMM-TILER driver Date: Wed, 22 Dec 2010 08:33:52 -0600 Message-ID: <20101222143350.GA27503@lba0869738> References: <1291674446-10766-1-git-send-email-davidsin@ti.com> <20101216172531.GG29435@lba0869738> <20101216173737.GA6767@lba0869738> <201012161843.48262.arnd@arndb.de> <20101216190207.GC6767@lba0869738> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Dave Airlie Cc: Arnd Bergmann , linux-arm-kernel@lists.infradead.org, dri-devel@lists.freedesktop.org, Greg KH , Russell King , Andrew Morton , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org List-Id: linux-omap@vger.kernel.org On Fri, Dec 17, 2010 at 09:28:07AM +1000, Dave Airlie wrote: > On Fri, Dec 17, 2010 at 5:02 AM, David Sin wrote: > I get the impression with the ARM graphics, that you just have a lot > of separate drivers for separate IP blocks all providing some misc > random interfaces to userspace where some binary driver binds all the > functionality together into a useful whole, which seems like a really > bad design. > > Generally on x86, the tiling hw is part of the GPU and is exposed as > part of a coherent GPU driver. > > I'm just wonder what the use-cases for this tiler are and what open > apps can use it for? > > Dave. Yes -- on the omap4 soc, the dmm-tiler hw block is separate from the gpu. I've had some, but not much, past discusions on hw designs where graphics/video related ip blocks are part of the same core. It's a good point that you bring up and it certainly makes sense to me. I will bring it up with some omap hw folks that I know, and see if something that can be considered in future omap versions. Some of the use-cases are HD video decoding and encoding. Also, hi-res image capture -- I believe 12MP or greater. OpenMax IL components and other multimedia frameworks can allocate video memory through a user space tiler library. Thanks for your comments, Dave. -- David Sin