From 156961ae7bdf6feb72778e8da83d321b273343fd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@linux.intel.com>
Date: Fri, 8 Dec 2017 23:37:36 +0200
Subject: drm/i915: Disable DC states around GMBUS on GLK
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From: Ville Syrjälä <ville.syrjala@linux.intel.com>

commit 156961ae7bdf6feb72778e8da83d321b273343fd upstream.

Prevent the DMC from destroying GMBUS transfers on GLK. GMBUS
lives in PG1 so DC off is all we need.

Cc: stable@vger.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171208213739.16388-1-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/intel_runtime_pm.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -1844,6 +1844,7 @@ void intel_display_power_put(struct drm_
 	CNL_DISPLAY_POWERWELL_2_POWER_DOMAINS |		\
 	BIT_ULL(POWER_DOMAIN_MODESET) |			\
 	BIT_ULL(POWER_DOMAIN_AUX_A) |			\
+	BIT_ULL(POWER_DOMAIN_GMBUS) |			\
 	BIT_ULL(POWER_DOMAIN_INIT))
 
 static const struct i915_power_well_ops i9xx_always_on_power_well_ops = {