drm/xe: Add wa_14025941587 to xe2, xe3 and xe3p platforms

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Avoid programming the IDLEDLY timer to less than 5 microseconds.
Apply wa_14025941587 to Graphics Versions 20.01 to 35.11
and Media Versions 13.01 to 35.03

v2: Use xe_rtp_match_not_sriov_vf, move to local variable
    Remove warn and other knits            - Matt R

v3: Add verbose comment - Tejas

v4: Restore IDLE_DLY register on engine reset.
    Add it to GUC save-restore list. -Vivek

v5: Extend WA to Media Versions 13.01 to 35.03 - Vinay

v6: Avoid clearing inhibit switch - Bala
    Refactor code accordingly by adding idle_reg_val.

v7: Rebased with the divide-by-zero/overflow guards living in
    a separate hardening patch.

v8: Preserve the Wa_16023105232 floor (DIV_ROUND_DOWN_ULL) and the
    maxcnt == 0 guard from the hardening patch. Round up
    (DIV_ROUND_UP_ULL) the Wa_14025941587 minimum conversion instead,
    so the tick-quantized delay cannot round back below 5 us.

v9: Evaluate the Wa_16023105232 xe_gt_WARN_ON() against the value
    read from hardware instead of the Wa_14025941587-bumped value,
    so it no longer fires on the driver's own floor. Re-check the
    rounded-up tick value against maxcnt and floor it if tick
    quantization pushed it back to/above maxcnt, logging via
    xe_gt_dbg since this is the driver's own value, not a hardware
    anomaly.

Assisted-by: GitHub_Copilot:claude-opus-4.8
Signed-off-by: Tangudu Tilak Tirumalesh <tilak.tirumalesh.tangudu@intel.com>
Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Link: https://patch.msgid.link/20260916100545.779894-3-tilak.tirumalesh.tangudu@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

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This commit is contained in:

Tangudu Tilak Tirumalesh 2026-09-16 15:35:45 +05:30 • committed by Matt Roper

parent d864065ea2

commit 9453c528fc

3 changed files with 79 additions and 18 deletions

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2

drivers/gpu/drm/xe/xe_guc_ads.c

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95

drivers/gpu/drm/xe/xe_hw_engine.c

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2

drivers/gpu/drm/xe/xe_wa_oob.rules

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