Intel-XE Archive on lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH v3 00/10] Implement Wa_14021768792 to bypass m_n ratio limit
@ 2026-09-16  9:09 Suraj Kandpal
  2026-09-16  9:09 ` [PATCH v3 01/10] drm/i915/display: Add helper to compute link M/N ratio for reuse Suraj Kandpal
                   ` (12 more replies)
  0 siblings, 13 replies; 19+ messages in thread
From: Suraj Kandpal @ 2026-09-16  9:09 UTC (permalink / raw)
  To: intel-xe, intel-gfx; +Cc: ankit.k.nautiyal, arun.r.murthy, 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 (8):
  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 with warning 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: Add bits for Wa_14021768792 for linkm/n ratio > 10
  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 (2):
  drm/i915/dp: Limit M/N ratio for DP SST
  drm/i915/dp: Bump the max Link M/N ratio to 22 for DISPLAY_VER >= 35

 drivers/gpu/drm/i915/display/intel_display.c  | 122 +++++++++++--
 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   |   9 +
 .../gpu/drm/i915/display/intel_display_wa.h   |   1 +
 drivers/gpu/drm/i915/display/intel_dp.c       | 167 +++++++++++++++++-
 drivers/gpu/drm/i915/display/intel_dp.h       |   6 +
 drivers/gpu/drm/i915/display/intel_dp_mst.c   |   7 +
 9 files changed, 319 insertions(+), 11 deletions(-)

-- 
2.34.1


^ permalink raw reply	[flat|nested] 19+ messages in thread

end of thread, other threads:[~2026-09-16 11:30 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-09-16  9:09 [PATCH v3 00/10] Implement Wa_14021768792 to bypass m_n ratio limit Suraj Kandpal
2026-09-16  9:09 ` [PATCH v3 01/10] drm/i915/display: Add helper to compute link M/N ratio for reuse Suraj Kandpal
2026-09-16  9:09 ` [PATCH v3 02/10] drm/i915/dp: Limit M/N ratio for DP SST Suraj Kandpal
2026-09-16  9:25   ` sashiko-bot
2026-09-16  9:33     ` Kandpal, Suraj
2026-09-16  9:09 ` [PATCH v3 03/10] drm/i915/dp_mst: Limit M/N ratio for MST Suraj Kandpal
2026-09-16  9:09 ` [PATCH v3 04/10] drm/i915/dp: Add M/N ratio check with warning for DP link config Suraj Kandpal
2026-09-16  9:23   ` sashiko-bot
2026-09-16  9:09 ` [PATCH v3 05/10] drm/i915/display: Add bits for link_n_extended for DISPLAY >= 14 Suraj Kandpal
2026-09-16  9:09 ` [PATCH v3 06/10] drm/i915/display_wa: Add support for Wa_14021768792 Suraj Kandpal
2026-09-16  9:09 ` [PATCH v3 07/10] drm/i915/display: Add bits for Wa_14021768792 for linkm/n ratio > 10 Suraj Kandpal
2026-09-16  9:23   ` sashiko-bot
2026-09-16  9:09 ` [PATCH v3 08/10] drm/i915/display: Implement Wa_14021768792 for BMG DP for link_m/n " Suraj Kandpal
2026-09-16  9:27   ` sashiko-bot
2026-09-16  9:09 ` [PATCH v3 09/10] drm/i915/dp: Extend intel_dp_can_support_m_n() for BMG M/N bypass Suraj Kandpal
2026-09-16  9:09 ` [PATCH v3 10/10] drm/i915/dp: Bump the max Link M/N ratio to 22 for DISPLAY_VER >= 35 Suraj Kandpal
2026-09-16  9:18 ` ✓ CI.KUnit: success for Implement Wa_14021768792 to bypass m_n ratio limit (rev8) Patchwork
2026-09-16  9:55 ` ✓ Xe.CI.BAT: " Patchwork
2026-09-16 11:30 ` ✗ Xe.CI.FULL: failure " Patchwork

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox