[Intel-gfx] [PATCH 0/3] Do not re-read dpll registers

[Jani Nikula]

On Thu, 21 Mar 2019, Lucas De Marchi <lucas.demarchi at intel.com> wrote:
> Instead of re-reading the registers we just read on the hw state
> readout, use the values saved on intel_shared_dpll. Besides not doing
> the MMIO, this helps on sharing code since we don't have to
> differentiate e.g. ICL and CNL because they have different registers for
> the same thing.
>
> I'm a little hesitant wrt DSI. It seems we have completly different
> implementations for ICL and gen <= 11.

That's obviously a typo, ICL being gen 11 and introducing the new DSI
hardware and requiring a completely different implementation.

> BXT has another hook so is not affected, but I'm not sure if we have
> any other gens with DSI that share the skl hooks.

VLV/CHV/BXT/GLK all have their own DSI PLL stuff. ICL or gen 11 is the
divider.

BR,
Jani.





-- 
Jani Nikula, Intel Open Source Graphics Center