Re: [PATCH 2/4] drm/i915: merge VLV eDP and DP AUX clock divider calculation

[Imre Deak <imre.deak@intel.com>]

On Tue, 2013-05-21 at 13:59 +0300, Imre Deak wrote:
> On Tue, 2013-05-21 at 12:42 +0200, Daniel Vetter wrote:
> > On Tue, May 21, 2013 at 12:36 PM, Imre Deak <imre.deak@intel.com> wrote:
> > > On Tue, 2013-05-21 at 11:12 +0200, Daniel Vetter wrote:
> > >> On Thu, May 16, 2013 at 02:40:35PM +0300, Imre Deak wrote:
> > >> > On ValleyView for both eDP and DP the AUX input clock is 200MHz, so we
> > >> > can calculate for both the clock divider for the 2MHz target rate at the
> > >> > same place. Afterwards we can also replace the is_cpu_edp() check with a
> > >> > check for port A.
> > >> >
> > >> > Signed-off-by: Imre Deak <imre.deak@intel.com>
> > >>
> > >> There's a now-dead IS_VLV case in intel_hrawclk which should be killed
> > >> with this patch, too.
> > >
> > > Shouldn't it still return the correct value if someone calls it in the
> > > future? Actually it's also used in
> > > intel_dp_init_panel_power_sequencer_registers().
> > 
> > Indeed. I think though it's better to make this an explicit vlv case
> > since hrawclk talks about the FSB. And that thing pretty surely
> > doesn't exist on vlv any more ;-)
> 
> Ok. Tbh, I haven't thought about the differences in clock topology
> across the platforms, but would be nice to understand it better.

I checked now and the VLV spec does define hrawclk, so that would
justify keeping it in intel_hrawclk.

--Imre