drm/i915/lspcon: Fix resume time initialization due to unasserted HPD

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During system resume time initialization the HPD level on LSPCON ports
can stay low for an extended amount of time, leading to failed AUX
transfers and LSPCON initialization. Fix this by waiting for HPD to get
asserted.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99178
Cc: Shashank Sharma <shashank.sharma@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: <stable@vger.kernel.org> # v4.9+
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Shashank Sharma <shashank.sharma@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1485509961-9010-3-git-send-email-imre.deak@intel.com

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This commit is contained in:

Imre Deak 2017-01-27 11:39:19 +02:00

parent 7fff8126d9

commit 390b4e0024

3 changed files with 8 additions and 3 deletions

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4

drivers/gpu/drm/i915/intel_dp.c

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2

drivers/gpu/drm/i915/intel_drv.h

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5

drivers/gpu/drm/i915/intel_lspcon.c

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