Author: jhb Date: Thu Dec 17 20:33:20 2015 New Revision: 292409 URL: https://svnweb.freebsd.org/changeset/base/292409
Log: t seems certain Intel GPUs use GPIO bitbanging over a child device instead of GMBUS access for I2C transfers. The GMBUS driver falls back to this mode when a transfer times out. However, the first transfer to timeout was sending the request back to itself resulting in an panic due to recursing on a lock. Fix it to forward the request on to the proper device. This appears to have been accidentally changed in r277487. Reported by: Joe Maloney <jmalo...@pcbsd.org> Reviewed by: adrian, dumbbell, imp MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D4599 Modified: head/sys/dev/drm2/i915/intel_iic.c Modified: head/sys/dev/drm2/i915/intel_iic.c ============================================================================== --- head/sys/dev/drm2/i915/intel_iic.c Thu Dec 17 19:36:25 2015 (r292408) +++ head/sys/dev/drm2/i915/intel_iic.c Thu Dec 17 20:33:20 2015 (r292409) @@ -456,7 +456,7 @@ timeout: /* Hardware may not support GMBUS over these pins? Try GPIO bitbanging instead. */ sc->force_bit_dev = true; - error = -IICBUS_TRANSFER(adapter, msgs, num); + error = -IICBUS_TRANSFER(dev_priv->bbbus[unit], msgs, num); out: sx_xunlock(&dev_priv->gmbus_sx); _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
