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authorMax Krummenacher <max.krummenacher@toradex.com>2012-12-13 19:47:32 -0700
committerMarcel Ziswiler <marcel.ziswiler@toradex.com>2012-12-17 13:27:29 +0100
commitf6417beb8f7bbfcbb9e047b582a22f4feaee3124 (patch)
tree5a5ff1bd8c6d35cd7a9c19de055273c4d7aa243c /arch/arm
parent8ec3b97a69a7aaa9fe0d9e2d977b118a62e03579 (diff)
tty: serial: 8250: tegra: irq 68: nobody cared workaround
The irq request flag sometimes does not get reset or is asserted immediately, but iir does not indicated this, if so ISR is entered with iir set to 0xc1, i.e. no irq pending. Try enabling the transmit register empty interrupt, iir becomes 0xc2, irq gets de-asserted and ier is reverted by the regular code flow in the ISR. We try this every 4096 spurious irq. Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
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