drm/msm/sde: fix race condition in vblank control interrupts
In Dual display concurrencies there are certain cases where irq_idx and vblank_refcount state mismatch can occur. To avoid it, during setup of irq_hw_idx, reset the vblank_refcount and unregister read ptr irq if not yet done by then along with maintaining global mutex lock for vblank_refcount. Also, if register IRQ fails, correct vblank_refcount so that IRQ registration can be tried again. Change-Id: I06bcbf71c6a43bd161ff61093d9f6063a292d6bc Signed-off-by:Raviteja Tamatam <travitej@codeaurora.org> Signed-off-by:
Samantha Tran <samtran@codeaurora.org>
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