drm/i915/vrr: Prepare to Use TRANS_PUSH mechanism for PSR frame change

drm/i915/vrr: Prepare to Use TRANS_PUSH mechanism for PSR frame change

On Lunarlake and onward it is possible to generate PSR Frame Change
event using TRANS_PUSH mechanism:

Ensure push is performed on flip if needed by PSR.

Don't use intel_psr_trigger_frame_change_event if PSR uses trans push as
Frame Change event: When not using trans push to generate Frame Change
event plane/pipe register writes are triggering the event. This is causing
problems when transiting to PSR active/idle and the event is coming in. To
tackle this we are waiting PSR to idle and using
intel_psr_trigger_frame_change_event to ensure PSR exit. If the Frame
change event is triggered after everything is configured (on trans push) we
don't need to worry about all this.

Ensure possible intel_vrr_tg_disable call is not overwriting
LNL_TRANS_PUSH_PSR_PR_EN.

v8:
  - split adding intel_vrr_psr_frame_change_enable as a separate change
  - update commit message
v7:
  - HAS_PSR_FRAME_CHANGE macro moved to separate patch and renamed as
    HAS_PSR_TRANS_PUSH_FRAME_CHANGE
  - use intel_psr_use_trans_push instead of HAS_PSR_FRAME_CHANGE in
    intel_psr_trigger_frame_change
  - moved calling intel_vrr_psr_frame_change_enable away from this patch
v6:
  - add HAS_PSR_FRAME_CHANGE macro
  - use TRANS_PUSH in instead of TRAN_VRR_CTL
v5: use intel_psr_use_trans_push for intel_vrr_psr_frame_change_enable
v4:
  - use rmw when enabling/disabling transcoder
  - set TRANS_PUSH_EN conditionally in intel_vrr_send_push
  - do not call intel_vrr_send_push from intel_psr_trigger_frame_change
  - do not enable using TRANS_PUSH mechanism for PSR "Frame Change"
v3:
  - use rmw when enabling/disabling
  - keep LNL_TRANS_PUSH_PSR_PR_EN set always on LunarLake and onwards
v2: use intel_vrr_trans_push_enabled_set_clear instead of rmw

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Link: https://patch.msgid.link/20260127124120.1069026-6-jouni.hogander@intel.com