[Bug 82551] [HSW/BDW/SKL mobile] HDMI hot plug sporadically cause ERROR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82551

Jesse Barnes <jbarnes at virtuousgeek.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #14 from Jesse Barnes <jbarnes at virtuousgeek.org> ---
Can you try this patch?  Just to see if gmbus is at fault here; we might need
to reset it harder in pre_xfer somehow.

diff --git a/drivers/gpu/drm/i915/intel_i2c.c
b/drivers/gpu/drm/i915/intel_i2c.c
index b31088a..0c82044 100644
--- a/drivers/gpu/drm/i915/intel_i2c.c
+++ b/drivers/gpu/drm/i915/intel_i2c.c
@@ -554,6 +554,8 @@ int intel_setup_gmbus(struct drm_device *dev)
                if (IS_I830(dev))
                        bus->force_bit = 1;

+               bus->force_bit = 1;
+
                intel_gpio_setup(bus, port);

                ret = i2c_add_adapter(&bus->adapter);

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