linux-kernel - Re: [PATCH 0/9] TI DMM-TILER driver

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Date:	Thu, 16 Dec 2010 11:37:38 -0600
From:	David Sin <davidsin@...com>
To:	arnd@...db.de
Cc:	linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, Greg KH <greg@...ah.com>,
	Russell King <rmk@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org
Subject: Re: [PATCH 0/9] TI DMM-TILER driver

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
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