drm/i915/display/mtl: Extend MBUS programming

Display version 14 also supports MBUS joining just like ADL-P
and also it does not need MBUS initialization, so extending ADL-P
code paths to display version 14 and higher.

Bspec: 49213
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220818234202.451742-20-radhakrishna.sripada@intel.com

drivers/gpu/drm/i915/display/intel_display_power.c

@@ -1102,7 +1102,7 @@ static void icl_mbus_init(struct drm_i915_private *dev_priv)
 	unsigned long abox_regs = INTEL_INFO(dev_priv)->display.abox_mask;
 	u32 mask, val, i;
 
-	if (IS_ALDERLAKE_P(dev_priv))
+	if (IS_ALDERLAKE_P(dev_priv) || DISPLAY_VER(dev_priv) >= 14)
 		return;
 
 	mask = MBUS_ABOX_BT_CREDIT_POOL1_MASK |

drivers/gpu/drm/i915/i915_drv.h

@@ -1358,7 +1358,7 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_D12_PLANE_MINIMIZATION(dev_priv) (IS_ROCKETLAKE(dev_priv) || \
 					      IS_ALDERLAKE_S(dev_priv))
 
-#define HAS_MBUS_JOINING(i915) (IS_ALDERLAKE_P(i915))
+#define HAS_MBUS_JOINING(i915) (IS_ALDERLAKE_P(i915) || DISPLAY_VER(i915) >= 14)
 
 #define HAS_3D_PIPELINE(i915)	(INTEL_INFO(i915)->has_3d_pipeline)