[Bug 90418] Front buffer tracker is not invalidating the fb obj for DRRS/PSR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90418

--- Comment #9 from Ramalingam C <ramalingam.c at intel.com> ---
Upclocking was needed in intel_edp_drrs_invalidate and also in
intel_edp_drrs_flush. Documentation on intel_edp_drrs_flush mislead to a
expectation of the intel_fb_obj_invalidate for every content change in the
planes. 

A change is submitted for documentation correction and also for the code
change.

Thanks Daniel for finding the cause. 
Thanks Chris for helping me in the debugging.

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