• Michael Hennerich's avatar
    Blackfin: SIC: BF537: change default data/error relative priorities · 2adcf194
    Michael Hennerich authored
    Some peripherals might generate an error interrupt shortly after the
    data interrupt due to the fact that the peripheral isn't serviced fast
    enough.  In most cases this isn't a problem and is expected behavior.
    This hasn't been a problem on most parts since you simply don't request
    the error interrupt (or you leave it disabled while there is an expected
    state) and do the peripheral status checking in the data interrupt.
    
    The Blackfin SIC allows people to prioritize data and error interrupts,
    and the Blackfin CEC allows interrupts of equal or higher priority to
    nest.  The current default settings gives error interrupts a higher
    priority than data interrupts.  So if an error occurs while processing
    the data interrupt, it will be serviced immediately.
    
    However, the error interrupt on the BF537 SIC cannot be enabled on a
    per-peripheral basis.  Once the error interrupt is enabled for one
    peripheral, it is automatically enabled for all peripherals.
    
    Therefore lower the default multiplexed error interrupt priority so
    most people need not worry themselves with this issue.
    Signed-off-by: default avatarMichael Hennerich <michael.hennerich@analog.com>
    Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
    2adcf194
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