[U-Boot] [PATCH 3/4] tegra: video: Always use write-through cache on LCD

[Thierry Reding]

On Mon, Jan 18, 2016 at 01:07:10PM -0700, Stephen Warren wrote:
> On 01/14/2016 01:26 PM, Simon Glass wrote:
> >This seems to give the best performance, so let's use it always.
> 
> I thought we chose the current cache mode due to display corruption issues
> with other modes, but I tested a change that I believe does the same as this
> change on Seaboard without any apparent issue so,
> 
> Acked-by: Stephen Warren <swarren at nvidia.com>

I think for framebuffers the best option is still write-combine, which
would be something like:

	DCACHE_WRITECOMBINE = DCACHE_OFF | TTB_SECT_B_MASK

on ARM v7. Did you ever benchmark that against DCACHE_WRITETHROUGH? It
should be faster provided that you never read from the region.

Thierry
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