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drm/xe/lnl: Apply Wa_22019338487

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This WA requires us to limit media GT frequency requests to a certain
cap value during driver load. Freq limits are restored after load
completes, so perf will not be affected during normal operations.

During normal driver operation, this WA requires dummy writes to media
offset 0x380D8C after every ~63 GGTT writes. This will ensure completion
of the LMEM writes originating from Gunit.

During driver unload(before FLR), the WA requires that we set requested
frequency to the cap value again.

v3: Do not use WA number in function name. Call WA wrapper from xe_device.
Rename some variables, check for locks in the correct function (Rodrigo).
Ensure reset path is also covered for this WA.

v4: Fix BAT failure

v5: Add a function pointer for ggtt_ops (Michal W)

v6: Fix name collision and use static function (Rodrigo)

Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240620224928.3986377-2-vinay.belgaumkar@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Vinay Belgaumkar 2024-06-20 15:49:27 -07:00 • committed by Rodrigo Vivi
commit 3b1592fb78
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13 changed files with 159 additions and 13 deletions
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