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* [PATCH v8 00/14] Implement Wa_14021768792 to bypass m_n ratio limit
@ 2026-10-23  5:02 Suraj Kandpal
  2026-10-23  5:02 ` [PATCH v8 01/14] drm/i915/display: Add helper to compute link M/N ratio for reuse Suraj Kandpal
                   ` (16 more replies)
  0 siblings, 17 replies; 24+ messages in thread
From: Suraj Kandpal @ 2026-10-23  5:02 UTC (permalink / raw)
  To: intel-gfx, intel-xe; +Cc: mitulkumar.ajitkumar.golani, Suraj Kandpal

For Platforms that support higher link rates, there is a limitation on
Link M /Link N ratio.
If the CEILING( Link M / Link N ) ratio is greater than 10.0, then
hardware cannot support the given resolution / refresh rate at the given
configuration.
For BMG Wa_14021768792 helps to bypass this limitation and allows it to
support the ratio till 15.0.

This series adds the missing restrictions for earlier platforms and adds
the Wa_14021768792 for BMG as per Bspec:49266

Ankit Nautiyal (7):
  drm/i915/display: Add helper to compute link M/N ratio for reuse
  drm/i915/dp_mst: Limit M/N ratio for MST
  drm/i915/dp: Add M/N ratio check for DP link config
  drm/i915/display: Add bits for link_n_extended for DISPLAY >= 14
  drm/i915/display_wa: Add support for Wa_14021768792
  drm/i915/display: Implement Wa_14021768792 for BMG DP for link_m/n
    ratio > 10
  drm/i915/dp: Extend intel_dp_can_support_m_n() for BMG M/N bypass

Suraj Kandpal (7):
  drm/i915/dp: Limit M/N ratio for DP
  drm/i915/display_wa: Add support for Wa_14014191401
  drm/i915/display: Add bits for Wa_14021768792 for linkm/n ratio > 10
  drm/i915/display: Program Wa_14021768792 for linkm/n ratio > 10
  drm/i915/display: Read back and compare Wa_14021768792 state
  drm/i915/display: Dump bypass_m_n_ratio_limit in the crtc state dump
  drm/i915/dp: Bump the max Link M/N ratio to 22 for DISPLAY_VER >= 35

 .../drm/i915/display/intel_crtc_state_dump.c  |   6 +-
 drivers/gpu/drm/i915/display/intel_display.c  | 113 +++++++++++-
 drivers/gpu/drm/i915/display/intel_display.h  |   4 +
 .../gpu/drm/i915/display/intel_display_regs.h |  12 ++
 .../drm/i915/display/intel_display_types.h    |   2 +
 .../gpu/drm/i915/display/intel_display_wa.c   |  11 ++
 .../gpu/drm/i915/display/intel_display_wa.h   |   2 +
 drivers/gpu/drm/i915/display/intel_dp.c       | 173 +++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_dp.h       |   8 +
 drivers/gpu/drm/i915/display/intel_dp_mst.c   |   7 +
 10 files changed, 329 insertions(+), 9 deletions(-)

-- 
2.34.1


^ permalink raw reply	[flat|nested] 24+ messages in thread

end of thread, other threads:[~2026-10-23  7:48 UTC | newest]

Thread overview: 24+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-10-23  5:02 [PATCH v8 00/14] Implement Wa_14021768792 to bypass m_n ratio limit Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 01/14] drm/i915/display: Add helper to compute link M/N ratio for reuse Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 02/14] drm/i915/dp: Limit M/N ratio for DP Suraj Kandpal
2026-10-23  5:18   ` sashiko-bot
2026-10-23  5:02 ` [PATCH v8 03/14] drm/i915/display_wa: Add support for Wa_14014191401 Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 04/14] drm/i915/dp_mst: Limit M/N ratio for MST Suraj Kandpal
2026-10-23  5:29   ` Golani, Mitulkumar Ajitkumar
2026-10-23  5:02 ` [PATCH v8 05/14] drm/i915/dp: Add M/N ratio check for DP link config Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 06/14] drm/i915/display: Add bits for link_n_extended for DISPLAY >= 14 Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 07/14] drm/i915/display_wa: Add support for Wa_14021768792 Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 08/14] drm/i915/display: Add bits for Wa_14021768792 for linkm/n ratio > 10 Suraj Kandpal
2026-10-23  5:09   ` Golani, Mitulkumar Ajitkumar
2026-10-23  5:02 ` [PATCH v8 09/14] drm/i915/display: Program " Suraj Kandpal
2026-10-23  5:11   ` Golani, Mitulkumar Ajitkumar
2026-10-23  5:02 ` [PATCH v8 10/14] drm/i915/display: Read back and compare Wa_14021768792 state Suraj Kandpal
2026-10-23  5:12   ` Golani, Mitulkumar Ajitkumar
2026-10-23  5:02 ` [PATCH v8 11/14] drm/i915/display: Dump bypass_m_n_ratio_limit in the crtc state dump Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 12/14] drm/i915/display: Implement Wa_14021768792 for BMG DP for link_m/n ratio > 10 Suraj Kandpal
2026-10-23  5:02 ` [PATCH v8 13/14] drm/i915/dp: Extend intel_dp_can_support_m_n() for BMG M/N bypass Suraj Kandpal
2026-10-23  5:16   ` Golani, Mitulkumar Ajitkumar
2026-10-23  5:02 ` [PATCH v8 14/14] drm/i915/dp: Bump the max Link M/N ratio to 22 for DISPLAY_VER >= 35 Suraj Kandpal
2026-10-23  5:11 ` ✓ CI.KUnit: success for Implement Wa_14021768792 to bypass m_n ratio limit (rev12) Patchwork
2026-10-23  5:55 ` ✓ Xe.CI.BAT: " Patchwork
2026-10-23  7:48 ` ✓ Xe.CI.FULL: " Patchwork

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