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* [PATCH 0/4] drm/i915/dp: Use the VBT eDP fast link training params
@ 2026-11-10 11:54 Lee Shawn C
  2026-11-10 11:54 ` [PATCH 1/4] drm/i915/bios: Split out parsing the " Lee Shawn C
                   ` (5 more replies)
  0 siblings, 6 replies; 12+ messages in thread
From: Lee Shawn C @ 2026-11-10 11:54 UTC (permalink / raw)
  To: intel-gfx, intel-xe; +Cc: Jani Nikula, Ville Syrjälä

The VBT provides per-panel eDP fast link training params, which the
driver parses but doesn't use. Use them when fast link training is
enabled in the VBT:

- Patch 1-2: parse the params only if the enable bit is set.
- Patch 3: start link training from the VBT vswing/pre-emphasis levels.
- Patch 4: use the VBT link rate and lane count.

The existing AUX handshake based link training sequence is kept; link
training without AUX handshake is not implemented.

Lee Shawn C (4):
  drm/i915/bios: Split out parsing the eDP fast link training params
  drm/i915/bios: Parse eDP fast link training params only if enabled
  drm/i915/dp: Start eDP link training from VBT fast link train
    vswing/pre-emphasis levels
  drm/i915/dp: Use the VBT fast link training link config for eDP

 drivers/gpu/drm/i915/display/intel_bios.c     | 85 ++++++++++++++-----
 .../drm/i915/display/intel_display_types.h    |  1 +
 drivers/gpu/drm/i915/display/intel_dp.c       | 58 +++++++++++++
 .../drm/i915/display/intel_dp_link_training.c | 76 +++++++++++++++++
 4 files changed, 197 insertions(+), 23 deletions(-)

-- 
2.53.0


^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2026-11-11  8:07 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-11-10 11:54 [PATCH 0/4] drm/i915/dp: Use the VBT eDP fast link training params Lee Shawn C
2026-11-10 11:54 ` [PATCH 1/4] drm/i915/bios: Split out parsing the " Lee Shawn C
2026-11-10 11:54 ` [PATCH 2/4] drm/i915/bios: Parse eDP fast link training params only if enabled Lee Shawn C
2026-11-10 12:07   ` sashiko-bot
2026-11-10 12:31   ` Ville Syrjälä
2026-11-11  8:07     ` Lee, Shawn C
2026-11-10 11:54 ` [PATCH 3/4] drm/i915/dp: Start eDP link training from VBT fast link train vswing/pre-emphasis levels Lee Shawn C
2026-11-10 12:14   ` sashiko-bot
2026-11-10 11:54 ` [PATCH 4/4] drm/i915/dp: Use the VBT fast link training link config for eDP Lee Shawn C
2026-11-10 12:14   ` sashiko-bot
2026-11-10 15:41 ` ✓ i915.CI.BAT: success for drm/i915/dp: Use the VBT eDP fast link training params Patchwork
2026-11-10 20:41 ` ✗ i915.CI.Full: failure " Patchwork

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