lkml.org 
[lkml]   [2018]   [May]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v1 2/2] cpufreq: tegra20: Use PLL_C as intermediate clock source
On Thu, May 24, 2018 at 03:49:22PM +0300, Dmitry Osipenko wrote:
> On 24.05.2018 13:04, Peter De Schrijver wrote:
> > On Wed, May 23, 2018 at 07:00:20PM +0300, Dmitry Osipenko wrote:
> >> PLL_C is running at 600MHz which is significantly higher than the 216MHz
> >> of the PLL_P and it is known that PLL_C is always-ON because AHB BUS is
> >> running on that PLL. Let's use PLL_C as intermediate clock source, making
> >> CPU snappier a tad during of the frequency transition.
> >>
> >
> > pll_c isn't necessarily 600Mhz when used as a source for the second display
> > head.
>
> Hmm, indeed.
>
> Even if PLL_C rate will be adjusted, it will be higher than the PLL_P.. won't
> it? That's likely to be good enough.
>

Yes. I think it can be always higher than pll_p, but that assumes the display
driver will always program the highest possible rate for pll_c for a given mode
and then program the display divider to divide it down to the required rate.

> Do you know if any of the available CCLK parents has a glitch-less rate
> switching? I.e. CPU won't hang on the rate switch.
>

Tegra20 doesn't have dynamic ramp PLLs no. So you always have to switch to a
backup clock source before changing the rate of pll_x.

> There is other possible 600MHz source, the PLL_M. Can we use it? This one also
> may become dynamic if we'll consider implementing the memory scaling, but the
> memory frequency probably will fit the transition role pretty well.

I think this should work, but as you mention it may very well be lower than
pll_p if Tegra20 EMC scaling is re-introduced. I think that's why historically
this was never done.

Peter.

\
 
 \ /
  Last update: 2018-05-25 08:33    [W:0.084 / U:0.768 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site