Re: [PATCH 1/3] drm/i915/dmc: Clear HRR EVT_CTL/HTP to zero on ADL-S

Hi Ville,

On ADL-S the main DMC HRR event DMC_EVT_CTL/HTP are never restored to their previous values during DC6 exit. This angers assert_dmc_loaded(), and basically makes the HRR handler unusable because we don't rewrite EVT_HTP when enabling DMC events.

Let's just clear the HRR EVT_CTL/HTP to zero from the beginnning so that the expected value matches the post-DC6 reality.

I suppose if we ever had actual use for HRR we'd have to both, reject HRR+PSR, and reprogram EVT_HTP when enabling the event. But for now we don't care about HRR so keeping both registers zeroed is fine.

...

LGTM.

Reviewed-by: Petr Vorel pvorel@suse.cz

Kind regards, Petr