Sudeep Holla c2b69f71ff
mailbox: pcc: Clear any pending responder interrupts before enabling it ...
Some platforms may leave a responder interrupt pending from earlier
transactions. If a PCC responder channel has a pending interrupt when
the controller starts up, enabling the IRQ line without first clearing
the condition can lead to a spurious interrupt which could disrupt other
transmissions if the IRQ is shared.
Explicitly clear any pending responder interrupt before enabling the IRQ
to ensure a clean start. Acknowledge the responder channel via
pcc_chan_acknowledge() in startup before requesting/enablement of the
IRQ. This ensures a clean baseline for the first transfer/receiption
of the notification/response.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com >
Tested-by: Adam Young <admiyo@os.amperecomputing.com >
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com >
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c2b69f71ff