On Thu, Dec 16, 2010 at 11:25:31AM -0600, David Sin wrote: > On Thu, Dec 16, 2010 at 02:34:05PM +0100, Arnd Bergmann wrote: > > On Monday 06 December 2010, David Sin wrote: > > > Tiling and Isometric Lightweight Engine for Rotation (TILER) driver > > > ===== > > > > > > Dynamic Memory Manager (DMM) is a hardware block made by Texas Instruments. > > > Within the DMM exists at least one TILER hardware component. Its purpose is to > > > organize video/image memory in a 2-dimensional fashion to limit memory > > > bandwidth and facilitate 0 effort rotation and mirroring. The TILER driver > > > facilitates allocating, freeing, as well as mapping 2D blocks (areas) in the > > > TILER container(s). It also facilitates rotating and mirroring the allocated > > > blocks or its rectangular subsections. > > > > How does this relate to DRM/GEM? I don't understand too much about graphics > > drivers, but it does sound like there is some overlap in functionality. > > > > I guess at the very least the DMM should live in drivers/gpu/ instead of > > drivers/misc, but perhaps it could be integrated more closely with the > > existing code there. > > > > Arnd > Do you know if anyone on your team is familiar with DRM/GEM (grap ext mgr) > for x86? I'm trying to understand the differences and make a case that > it's not the same as DMM/TILER. > > thanks, > -- > David Sin Hi Arnd, I'm not sure exactly how DRM/GEM works.. What functionality do you think is overlapping? The main feature, aside from reduced page accesses, of the DMM hw block is to provide physically contiguous 2 dimensional memory blocks for image and video processing. This hw sits between the interconnect and the ext memory interface in the OMAP, and contains an MMU-like address traslator for "virtually" physically contiguous memory and sdram pages. thank you for your comments. BR, -- David Sin -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
