[Intel-gfx] [PATCH 36/56] drm/i915/adl_p: Don't config MBUS and DBUF during display initialization

[Matt Roper]

From: José Roberto de Souza <jose.souza at intel.com>

Alderlake-P don't have programing sequences for MBUS or DBUF during
display initializaiton, instead it requires programing to those
registers during modeset because it to depend on the pipes left
enabled.

Bspec: 49213
Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/display/intel_display_power.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c b/drivers/gpu/drm/i915/display/intel_display_power.c
index 19d20a8c278c..e6edd5272072 100644
--- a/drivers/gpu/drm/i915/display/intel_display_power.c
+++ b/drivers/gpu/drm/i915/display/intel_display_power.c
@@ -5249,6 +5249,9 @@ static void gen12_dbuf_slices_config(struct drm_i915_private *dev_priv)
 	const int num_slices = INTEL_INFO(dev_priv)->num_supported_dbuf_slices;
 	enum dbuf_slice slice;
 
+	if (IS_ALDERLAKE_P(dev_priv))
+		return;
+
 	for (slice = DBUF_S1; slice < (DBUF_S1 + num_slices); slice++)
 		intel_de_rmw(dev_priv, DBUF_CTL_S(slice),
 			     DBUF_TRACKER_STATE_SERVICE_MASK,
@@ -5260,6 +5263,9 @@ static void icl_mbus_init(struct drm_i915_private *dev_priv)
 	unsigned long abox_regs = INTEL_INFO(dev_priv)->abox_mask;
 	u32 mask, val, i;
 
+	if (IS_ALDERLAKE_P(dev_priv))
+		return;
+
 	mask = MBUS_ABOX_BT_CREDIT_POOL1_MASK |
 		MBUS_ABOX_BT_CREDIT_POOL2_MASK |
 		MBUS_ABOX_B_CREDIT_MASK |
-- 
2.25.4