i2c: meson: improve interrupt handler and detect spurious interrupts

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If state is STATE_IDLE no interrupt should occur. Return IRQ_NONE
if such a spurious interrupt is detected.
Not having to take care of STATE_IDLE later in the interrupt handler
allows to further simplify the interrupt handler in subsequent
patches of this series.

In addition move resetting REG_CTRL_START bit to the start of the
interrupt handler to ensure that the start bit is always reset.
Currently the start bit is not reset for STATE_STOP because
i2c->state is set to STATE_IDLE.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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Heiner Kallweit 2017-03-25 14:10:08 +01:00 • committed by Wolfram Sang

parent e4d6bc380c

commit 38ed55ca9e

1 changed files with 7 additions and 4 deletions

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drivers/i2c/busses/i2c-meson.c

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