drm/i915/alpm: Compute LOBF late after guardband is already determined

Browse source

Currently intel_alpm_lobf_compute_config() tries to account for
guardband +SCL requirements during encoder->compute_config() phase,
even before guardband is computed.
Also, LOBF depends on crtc_state->has_psr which can be modified in
encoder->compute_config_late().

Account for lobf requirements while optimizing the guardband and add
checks for final guardband in encoder->compute_config_late() phase after
the guardband and the final state of crtc_state->has_psr are already
computed.

Use crtc_state->vrr.guardband and crtc_state->set_context_latency for
the computation and add more documentation for the dependency of first
sdp position, guardband, set context latency and wake lines.

v2: Add helper to use min guardband required for lobf.
v3: Remove unrelated inadvertent changes. (Michał)
v4: Add a #FIXME note for computing wakelines based on feature. (Jouni)

Bspec:71041
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Michał Grzelak <michal.grzelak@intel.com>
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Link: https://patch.msgid.link/20260204050250.762718-2-ankit.k.nautiyal@intel.com

...

This commit is contained in:

Ankit Nautiyal 2026-02-04 10:32:46 +05:30

parent 58bb61161e

commit 32c471e8f0

4 changed files with 63 additions and 14 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

70

drivers/gpu/drm/i915/display/intel_alpm.c

View file

3

drivers/gpu/drm/i915/display/intel_alpm.h

View file

2

drivers/gpu/drm/i915/display/intel_dp.c

View file

2

drivers/gpu/drm/i915/display/intel_vrr.c

View file