]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
drm/i915/pps: Reuse POWER_DOMAIN_DISPLAY_CORE in pps_{lock, unlock}
authorAnshuman Gupta <anshuman.gupta@intel.com>
Thu, 7 Jan 2021 11:25:00 +0000 (16:55 +0530)
committerJani Nikula <jani.nikula@intel.com>
Fri, 8 Jan 2021 16:29:49 +0000 (18:29 +0200)
commit5f8be91161b37e9396a8a4d4e014decbbe30383b
tree1ef8a8c0f5bdf8a02e704f8ae37619d246f87be0
parent10205618052908770451acd33eaeaa7685e97ed2
drm/i915/pps: Reuse POWER_DOMAIN_DISPLAY_CORE in pps_{lock, unlock}

We need a power_domain wakeref in pps_{lock,unlock} to prevent
a race while resetting pps state in intel_power_sequencer_reset().

intel_power_sequencer_reset() need a pps_mutex to access pps_pipe
but it can't grab pps_mutex due to deadlock with power_well
functions are called while holding pps_mutex.
intel_power_sequencer_reset() is called by power_well function
associated with legacy platforms like vlv and chv therefore re-use
the POWER_DOMAIN_DISPLAY_CORE power domain, which only used
by vlv and chv display power domain.

This will avoids the unnecessary noise of unrelated power wells
in pps_{lock,unlock}.

Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210107112500.16216-1-anshuman.gupta@intel.com
drivers/gpu/drm/i915/display/intel_dp.c