11 Jul
2012
11 Jul
'12
7:01 a.m.
Hi Stephen,
On Fri, Jun 15, 2012 at 1:49 AM, Stephen Warren swarren@wwwdotorg.orgwrote:
On 06/13/2012 10:19 AM, Simon Glass wrote:
Add support for adjusting the cachability of an L1 section by updating the MMU. The mmu_set_region_dcache() function allows drivers to make these changes after the MMU is set up.
It is implemented only for ARMv7 at present.
This is needed for LCD support, where we want to make the LCD frame
buffer
write-through (or off) rather than write-back.
Wouldn't performance be significantly better if the region was fully cached, but flushed after each display surface update?
That is the setting used on Tegra, yes. This function permits selection of the three options.
Regards, Simon