Re: [PATCH 72/89] drm/i915/skl: Enable/disable power well for aux transaction

Daniel Vetter
2014-11-11T14:42:48Z

On Tue, Nov 11, 2014 at 12:22:28PM +0000, Damien Lespiau wrote:
> Have us always take the AUX power domain in the AUX ->transfer vfunc.
> This won't toggle the power well on/off for each transfer if we
> correctly wrap known heavy users of the AUX channel, intel_dp_detect(),
> intel_dp_get_edid(), intel_dp_force and intel_dp_hpd_pulse() so we keep
> the power well alive for the duration of those. This will also allow
> one-of AUX transfers from DRM core when the power is down.

This kind of high-freq flip-flop of power domains is why the linux power
domain and runtime pm code has a disable timer. I guess as predicted,
we'll eventually implement it all ;-)
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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