tree d5c7f83ce9df41579c2adbe2dcaa0175342f4ed4
parent 1017a8fc5f60e6d819d9f3a165c1d4aef766cda0
author Matt DeVillier <matt.devillier@gmail.com> 1649715009 -0500
committer Paul Fagerburg <pfagerburg@chromium.org> 1654004589 +0000

drivers/i2c/dw_i2c: Adjust to handle 0-byte transfers

0-byte writes can be used as a way to probe/check presence of an i2c
device, so adjust _dw_i2c_transfer() to immediately set the STOP bit
and raise logger level for TX abort messages when the segment length
is zero. Adjust dw_i2c_transfer() to allow zero-segment-length
messages to be passed thru to _dw_i2c_transfer().

Tested as part of entire i2c-detect patch train.

Change-Id: I518e849f4c476c264a1464886b1853af66c0b29d
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63561
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@tutanota.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>