drm/nouveau: Fix drm poll_helper handling

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[ Upstream commit 9a2eba337c ]

Commit cae9ff036e effectively disabled the drm poll_helper by checking
the wrong flag to see if the driver should enable the poll or not:
mode_config.poll_enabled is only set to true by poll_init and it is not
indicating if the poll is enabled or not.
nouveau_display_create() will initialize the poll and going to disable it
right away. After poll_init() the mode_config.poll_enabled will be true,
but the poll itself is disabled.

To avoid the race caused by calling the poll_enable() from different paths,
this patch will enable the poll from one place, in the
nouveau_display_hpd_work().

In case the pm_runtime is disabled we will enable the poll in
nouveau_drm_load() once.

Fixes: cae9ff036e ("drm/nouveau: Don't enabling polling twice on runtime resume")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Reviewed-by: Lyude <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Peter Ujfalusi 2017-05-15 12:04:31 +03:00 • committed by Greg Kroah-Hartman

parent c94e2edace

commit bfa4d2e461

2 changed files with 5 additions and 7 deletions

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6

drivers/gpu/drm/nouveau/nouveau_display.c

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6

drivers/gpu/drm/nouveau/nouveau_drm.c

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