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drm/vc4: Handle drm_atomic_helper_swap_state failure

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drm_atomic_helper_swap_state() will be changed to interruptible waiting
in the next few commits, so all drivers have to be changed to handling
failure.

VC4 has its own nonblocking modeset tracking through the vc4->async_modeset
semaphore, so it doesn't need to stall in swap_state. Pass stall = false
and BUG_ON when it returns an error. This should never happen for !stall.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Eric Anholt <eric@anholt.net>
Link: http://patchwork.freedesktop.org/patch/msgid/20170711143314.2148-11-maarten.lankhorst@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Maarten Lankhorst 2017-07-11 16:33:12 +02:00 committed by Daniel Vetter
parent fad9e43a33
commit d68bc0e75a
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/vc4/vc4_kms.c
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@ -126,7 +126,7 @@ static int vc4_atomic_commit(struct drm_device *dev,
* the software side now.
*/
drm_atomic_helper_swap_state(state, true);
BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
/*
* Everything below can be run asynchronously without the need to grab