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PR/53356 CVS commit: [netbsd-8] src/sys/dev/i2c

The following reply was made to PR kern/53356; it has been noted by GNATS.

From: "Soren Jacobsen" <>
Subject: PR/53356 CVS commit: [netbsd-8] src/sys/dev/i2c
Date: Mon, 15 Oct 2018 03:09:07 +0000

 Module Name:	src
 Committed By:	snj
 Date:		Mon Oct 15 03:09:07 UTC 2018
 Modified Files:
 	src/sys/dev/i2c [netbsd-8]: gttwsi_core.c gttwsivar.h
 Log Message:
 Pull up following revision(s) (requested by bouyer in ticket #1061):
 	sys/dev/i2c/gttwsi_core.c: revision 1.4-1.8 via patch
 	sys/dev/i2c/gttwsivar.h: revision 1.4 via patch
 Use IPL_VM for bus lock so we can do i2c xfers from interrupt context
 Don't sleep with IPL_VM lock held.
 When initiating a transfer, if a device isn't present, we won't
 get an ACK after sending the address.  Check for this alternate
 state and suppress the error message when it occurs.
 Fixes PR kern/53356.
 Bail early if gttwsi_send_start() fails in gttwsi_initiate_xfer() to
 avoid unexpected state error message later (on Allwinner H5).
 Expand code covered by sc->sc_mtx, to make sure an interrupt would not be
 handled before the cv_timedwait_sig() call, or while polling.
 Seems to fix "sunxitwi0: send STOP failed" messages frequently seen related
 to axp20x0 sensors.
 To generate a diff of this commit:
 cvs rdiff -u -r1.2 -r1.2.12.1 src/sys/dev/i2c/gttwsi_core.c \
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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