[PATCH 0/3] drm/i915: Handle hanging during nonblocking modeset correctly.

[Ville Syrjälä]

On Thu, Jan 26, 2017 at 04:59:21PM +0100, Maarten Lankhorst wrote:
> When writing some testcases for nonblocking modesets. I found out that the
> infinite wait on the old fb was causing issues.
> 
> A nonblocking modeset with a hang on the old fb, followed by a blocking
> update was enough to trigger it.
> 
> For old platforms patch 2 is needed else
> kms_busy.extended-modeset-hang-oldfb-*
> will put the gpu in a bad state when the 90s in swap_state is reached,
> for newer platforms patch 3 will fix this. The display doesn't need to be
> reset when there are no CS flips and no display reset.
> 
> If you have a newer platform, (gen4+) then the display reset can be

g4x+

> simulated with the kms_busy.extended-modeset-hang-oldfb-with-reset-* test.
> 
> Maarten Lankhorst (3):
>   drm/atomic: Bump timeout for waiting for hw_done to 90s in swap_state
>   drm/i915: Set a timeout when waiting for fence on the old fb
>   drm/i915: Skip modeset locking when atomic pageflips are used.
> 
>  drivers/gpu/drm/drm_atomic_helper.c  | 12 ++++++++----
>  drivers/gpu/drm/i915/intel_display.c | 14 +++++++++++++-
>  2 files changed, 21 insertions(+), 5 deletions(-)
> 
> -- 
> 2.7.4
> 
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-- 
Ville Syrjälä
Intel OTC