diff options
| author | Michał Grzelak <michal.grzelak@intel.com> | 2026-04-16 18:37:44 +0200 |
|---|---|---|
| committer | Tvrtko Ursulin <tursulin@ursulin.net> | 2026-05-26 09:31:42 +0100 |
| commit | 202e77cf2e839e1adc804433322dc5c9ee511c9f (patch) | |
| tree | a16117bae152212c0991522fc4309d2577521231 /kernel | |
| parent | 5c4063c87a619e4df954c179d24628636f5db15f (diff) | |
drm/i915/aux: use polling when irqs are unavailable
PTL with physically disconnected display was observed to have 40s longer
execution time when testing xe_fault_injection@xe_guc_mmio_send_recv.
The issue has not been seen when reverting commit 40a9f77a28fa ("Revert
"drm/i915/dp: change aux_ctl reg read to polling read"").
Apparently the configuration suffers from not having AUX enabled when
using interrupts. One probable cause can be xe enabling interrupts too
late: interrupts need memory allocations which currently can't be done
before the display FB takeover is done.
As for now, use polling for AUX in case interrupts are unavailable.
Fixes: 40a9f77a28fa ("Revert "drm/i915/dp: change aux_ctl reg read to polling read"")
Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Michał Grzelak <michal.grzelak@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260416163744.288107-1-michal.grzelak@intel.com
(cherry picked from commit 05e0550b65cd1604bd515fbc65f522bce4c10a87)
Signed-off-by: Tvrtko Ursulin <tursulin@ursulin.net>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions