drm/i915: Disable DC states around GMBUS on GLK

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>
(cherry picked from commit 156961ae7bdf6feb72778e8da83d321b273343fd)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 8af286c..9bf46ab 100644 (file)
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -1786,6 +1786,7 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
        GLK_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))
 
 #define CNL_DISPLAY_POWERWELL_2_POWER_DOMAINS (                \