drm/xe/bmg: Update Wa_22019338487

Limit GT max frequency to 2600MHz and wait for frequency to reduce
before proceeding with a transient flush. This is really only needed for
the transient flush: if L2 flush is needed due to 16023588340 then
there's no need to do this additional wait since we are already using
the bigger hammer.

v2: Use generic names, ensure user set max frequency requests wait
for flush to complete (Rodrigo)
v3:
 - User requests wait via wait_var_event_timeout (Lucas)
 - Close races on flush + user requests (Lucas)
 - Fix xe_guc_pc_remove_flush_freq_limit() being called on last gt
   rather than root gt (Lucas)
v4:
 - Only apply the freq reducing part if a TDF is needed: L2 flush trumps
   the need for waiting a lower frequency

Fixes: aaa08078e725 ("drm/xe/bmg: Apply Wa_22019338487")
Reviewed-by: Rodrigo Vivi <[email protected]>
Signed-off-by: Vinay Belgaumkar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lucas De Marchi <[email protected]>
(cherry picked from commit deea6a7d6d803d6bb874a3e6f1b312e560e6c6df)
Signed-off-by: Lucas De Marchi <[email protected]>

0 files changed, 0 insertions, 0 deletions