Commits
Chris Wilson committed 7f58aabc369
drm/i915: Reset GMBUS controller after NAK Once a NAK has been asserted by the slave, we need to reset the GMBUS controller in order to continue. This is done by asserting the Software Clear Interrupt bit and then clearing it again to restore operations. If we don't clear the NAK, then all future GMBUS xfers will fail, including DDC probes and EDID retrieval. v2: Add some comments as suggested by Keith Packard. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=35781 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Keith Packard <keithp@keithp.com> Tested-by: Jesse Barnes <jbarnes@virtuousgeek.org> Tested-by: "Mengmeng Meng" <mengmeng.meng@intel.com>