Re: [RFC] Unified DRM GPU frequency knobs

[Ben Widawsky <ben@bwidawsk.net>]

On Sun, 9 Sep 2012 12:42:55 -0700
Ben Widawsky <ben@bwidawsk.net> wrote:

> On the Intel driver we've developed and reviewed some patches which
> enable GPU frequency settings in sysfs. Similar interfaces have
> existed for some time in our debugfs, but now we're getting interest
> from users like PowerTOP and have decided to formalize it. Most
> likely other DRM drivers have similar features; and perhaps similar
> proposals have gone out in the past.
> 
> Boiling down what we've exposed in our patches:
> read current GPU frequency
> read/write min frequency
> read/write max frequency
> read HW support lowest frequency (we call this RPn)
> read HW supported highest frequency (we call this RP0)
> read HW recommended low frequnecy (we call this RP1)
> 
> If no interest is perceived we will move forward with these as Intel
> only sysfs interfaces.
> 
> The Intel specific patches which are ready to go are here:
> http://lists.freedesktop.org/archives/intel-gfx/2012-September/020342.html
> 
> Thanks.
> 

I was called out for not being clear. I'm asking if there
is interest in making unified knobs in DRM as opposed to driver specific
knobs. Is that even a good idea, and/or make sense to do?



-- 
Ben Widawsky, Intel Open Source Technology Center