[PATCH v4 0/1] drm/xe: Set GT rp min frequency as 1.2GHz default for BMG/CRI

[Nareshkumar Gollakoti <naresh.kumar.g@intel.com>]

Performance degradation occurs in multi-BMG GPU configurations 
during Peer-to-Peer transactions when one of the two GPUs remains idle
with no engine activity.
The root cause has been identified as frequency downscaling:
the idle remote GPU reduces its operating frequency to the minimum 400MHz,
which negatively impacts the bandwidth available for P2P transactions 
initiated by the active local GPU.

To address above problem this patch ensures for the platform BMG/CRI
of graphics(GT0) tile.the default GT rp frquency min set as 1.2GHz
to ensure effetive P2P transaction bandwidth.

Frequency boosting improves performance, but at the expense of
power consumption.Note that this change only impacts active frequency,
so idle power consumption should remain the same.

v2:
- Fix Indentation(Thomas)
- Add comment about power impact(Stuart)

v3:(Thomas/Ankur/Matt Roper)
- Add setting frequency to only GT0(Graphics) Tile of BMG/CRI

v4:(Stuart)
- Move WA check to pc_needs_min_freq_change function

Nareshkumar Gollakoti (1):
  drm/xe: Set GT rp min frequency as 1.2GHz default for BMG/CRI

 drivers/gpu/drm/xe/xe_guc_pc.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

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2.43.0