drm/i915/psr: Enable AUX-A IO power well on ICL for PSR

PSR requires AUX IO power well to be enabled. This was already in place
for CNL, extend this for ICL too. Not enabling the power well results in
the aux error interrupts when the hardware exits PSR.
Reported-by: NCasey G Bowman <casey.g.bowman@intel.com>
Reported-by: NJyoti R Yadav <jyoti.r.yadav@intel.com>
Cc: Matt Atwood <matthew.s.atwood@intel.com>
Cc: Jyoti R Yadav <jyoti.r.yadav@intel.com>
Cc: Casey G Bowman <casey.g.bowman@intel.com>
Tested-by: NCasey G Bowman <casey.g.bowman@intel.com>
Signed-off-by: NDhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: NImre Deak <imre.deak@intel.com>
Reviewed-by: NJosé Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180914001822.2503-1-dhinakaran.pandiyan@intel.com

drivers/gpu/drm/i915/intel_ddi.c

@@ -2077,7 +2077,7 @@ bool intel_ddi_get_hw_state(struct intel_encoder *encoder,
 static inline enum intel_display_power_domain
 intel_ddi_main_link_aux_domain(struct intel_dp *intel_dp)
 {
-	/* CNL HW requires corresponding AUX IOs to be powered up for PSR with
+	/* CNL+ HW requires corresponding AUX IOs to be powered up for PSR with
 	 * DC states enabled at the same time, while for driver initiated AUX
 	 * transfers we need the same AUX IOs to be powered but with DC states
 	 * disabled. Accordingly use the AUX power domain here which leaves DC

drivers/gpu/drm/i915/intel_runtime_pm.c

@@ -1996,6 +1996,7 @@ void intel_display_power_put(struct drm_i915_private *dev_priv,
 	BIT_ULL(POWER_DOMAIN_PORT_DDI_F_IO))
 
 #define ICL_AUX_A_IO_POWER_DOMAINS (			\
+	BIT_ULL(POWER_DOMAIN_AUX_IO_A) |		\
 	BIT_ULL(POWER_DOMAIN_AUX_A))
 #define ICL_AUX_B_IO_POWER_DOMAINS (			\
 	BIT_ULL(POWER_DOMAIN_AUX_B))