drm/msm/dp: protect power on/off functionalities with mutex
In case of multiple threads trying to power on/off DP driver simultaneously, un-clocked register access may happen. Use session_lock in all conditions to avoid such scenario. Change-Id: I6d8f82b3c37bf54965176dae50e0f9dca5343e2e Signed-off-by:Ajay Singh Parmar <aparmar@codeaurora.org> Signed-off-by:
Tatenda Chipeperekwa <tatendac@codeaurora.org>
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