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6 Commits

Author SHA1 Message Date
Michael Gmelin
0ba5622d8c Fix ig4 operation for certain machines 
Some machine BIOSes use the I2C bus and leave it in a state that causes
interrupts to not work properly due to a pending interrupt having been
latched.

Refactor the code a bit to clear pending interrupts when I2C is enabled.
This fixes the primary problem.

Also fix a possible race condition in the interrupt handler where the
interrupt was being cleared after reading the status instead of before.

Reported by:	pfg
Reviewed by:	jhb
Approved by:	jhb
Obtained from:	DragonFly BSD
Differential Revision:	https://reviews.freebsd.org/D6586
 2016-05-30 09:05:24 +00:00
Pedro F. Giffuni
453130d9bf sys/dev: minor spelling fixes. 
Most affect comments, very few have user-visible effects.
 2016-05-03 03:41:25 +00:00
John Baldwin
59e4a8cd1c Use DELAY() instead of sleeping during boot-time attach. 
Tested by:	Wolfgang Zenker <wolfgang@lyxys.ka.sub.org>
 2016-04-09 20:18:34 +00:00
Michael Gmelin
12e413be27 Allow building a kernel with baked in ig4, isl and cyapa drivers. 
Also addresses jhb's remarks on D2811 and D3068.

PR:		202059
Differential Revision:	https://reviews.freebsd.org/D3351
Reviewed by:	jhb
Approved by:	jhb
 2015-08-19 09:49:29 +00:00
Michael Gmelin
4cd6abddcd Protect smbus ioctls in ig4 driver using a shared lock. 
Document locking semantics.

Differential Revision:	https://reviews.freebsd.org/D2744
Reviewed by:	jah, kib
Approved by:	kib
 2015-06-25 07:52:51 +00:00
Michael Gmelin
71d51719ea ig4 - Intel fourth gen integrated I2C SMBus driver. 
Differential Revision:	https://reviews.freebsd.org/D2372
Reviewed by:	jhb, wblock, adrian
Approved by:	jhb, wblock
Relnotes:	yes
 2015-05-30 12:17:18 +00:00