[PATCH 0/4] drm/i915: Avoid early timeout due to wait_for_atomic

[Imre Deak <imre.deak@intel.com>]

If called from non-atomic context wait_for_atomic{,_us} can fail even
though the given condition becomes true before the timeout passes. I
noticed this via sporadic timeouts during PLL locking on BXT (fixed by
patch 1). The WARN in wait_for_atomic would be also triggered, alas I
didn't have extra debugging enabled.

host2guc_action() has the same issue. I left that as-is since it seems
to be on a critical path where the overhead of the jiffies based
wait_for can be considerable. Due to the relatively long 10ms timeout
there this doesn't lead to early timeouts in any case.

CC: Chris Wilson <chris@chris-wilson.co.uk>
CC: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Imre Deak (4):
  drm/i915/bxt: Avoid early timeout during PLL enable
  drm/i915/lpt: Avoid early timeout during FDI PHY reset
  drm/i915/hsw: Avoid early timeout during LCPLL disable/restore
  drm/i915: Avoid early timeout during AUX transfers

 drivers/gpu/drm/i915/intel_display.c  | 16 ++++++++--------
 drivers/gpu/drm/i915/intel_dp.c       |  2 +-
 drivers/gpu/drm/i915/intel_dpll_mgr.c |  4 ++--
 3 files changed, 11 insertions(+), 11 deletions(-)

-- 
2.5.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx