Quoting Ville Syrjala (2017-11-23 19:41:57)
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> The hardware always writes one or two bytes in the index portion of
> an indexed transfer. Make sure the message we send as the index
> doesn't have a zero length.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Sean Paul <seanpaul@xxxxxxxxxxxx>
> Fixes: 56f9eac05489 ("drm/i915/intel_i2c: use INDEX cycles for i2c read transactions")
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
-Chris