i2c-designware: Skip RX_FULL and TX_EMPTY bits on tx abort errors

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Suppose TX_ABRT occurs in the middle of processing i2c_msg msgs[], and
a STOP condition has already been generated on the bus.  In this case,
subsequent i2c_dw_xfer_msg() might initiate a new and unnecessary I2C
transaction, which we'd have to avoid.

Furthermore, anytime TX_ABRT is set, the contents of tx/rx buffers are
flushed, so we don't have to process RX_FULL and TX_EMPTY.

Disable interrupts, and skip them.

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

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Shinya Kuribayashi 2009-11-06 21:51:36 +09:00 • committed by Ben Dooks

parent 8f588e40c7

commit 597fe310f1

1 changed files with 8 additions and 0 deletions

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drivers/i2c/busses/i2c-designware.c

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