Mailinglist Archive: radeonhd (408 mails)

[Matthias Hopf <mhopf@xxxxxxx>]

On May 29, 09 09:40:13 -0400, Alex Deucher wrote:
> This is the tricky part of power management.  You need to slow the
> clock at the right times otherwise you can negatively impact the user
> experience.  If you are going to run with reduced clocks you need to
> take into account the bandwidth requirements (display controllers, 2D
> engine, 3D engine, overlays, etc.) and latency requirements (frame has
> to be rendered in this amount of time).  That's why the best place for

Also note that we're doing *no* bandwidth requirement calculation at the
moment. They tend to be tricky. So the best we can do for calculating
memory speeds is guessing. Which is a contradiction by itself.

> power management will be in the new kms drm since only there does the
> driver have the full view of the hw (modesetting and command streams)
> so that it can change the clocks on demand in response to the current
> demands of the chip.

Also note that AFAIK there is no interface for that defined yet.

Matthias

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