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authorLyude <cpaul@redhat.com>2016-06-21 17:03:43 -0400
committerDaniel Vetter <daniel.vetter@ffwll.ch>2016-07-14 22:06:11 +0200
commitb236d7c8421969ac0693fc571e47ee5c2a62fb90 (patch)
treeff8053bce8d1162f03cae1603e0cd39a4991e877 /drivers/hv
parent9504a89247595b6c066c68aea0c34af1fc78d021 (diff)
downloadlinux-b236d7c8421969ac0693fc571e47ee5c2a62fb90.tar.gz
drm/i915/vlv: Disable HPD in valleyview_crt_detect_hotplug()
One of the things preventing us from using polling is the fact that
calling valleyview_crt_detect_hotplug() when there's a VGA cable
connected results in sending another hotplug. With polling enabled when
HPD is disabled, this results in a scenario like this:

- We enable power wells and reset the ADPA
- output_poll_exec does force probe on VGA, triggering a hpd
- HPD handler waits for poll to unlock dev->mode_config.mutex
- output_poll_exec shuts off the ADPA, unlocks dev->mode_config.mutex
- HPD handler runs, resets ADPA and brings us back to the start

This results in an endless irq storm getting sent from the ADPA
whenever a VGA connector gets detected in the middle of polling.

Somewhat based off of the "drm/i915: Disable CRT HPD around force
trigger" patch Ville Syrjälä sent a while back

Cc: stable@vger.kernel.org
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Lyude <cpaul@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/hv')
0 files changed, 0 insertions, 0 deletions