i2c: imx-lpi2c: directly return ISR when detect a NACK

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A NACK flag in ISR means i2c bus error. In such condition,
there is no need to do read/write operation.

In this patch, i2c will check MSR_NDF, MSR_RDF and MSR_TDF
flag in turn, it's making mutually exclusive NACK/read/write.
So when a NACK is received(MSR_NDF), i2c will return ISR
directly and then stop i2c transfer.

Signed-off-by: Carlos Song <carlos.song@nxp.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20230727030347.3552992-1-carlos.song@nxp.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>

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Carlos Song 2023-07-27 11:03:47 +08:00 • committed by Andi Shyti

parent 52a93d39b1

commit 224acec664

1 changed files with 4 additions and 6 deletions

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drivers/i2c/busses/i2c-imx-lpi2c.c

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