drm/i915/mtl: Add support for MTL in Display Init sequences

The initialization sequence for Meteorlake reuses the sequence for
icelake for most parts. Some changes viz. reset PICA handshake
are added.

Bspec: 49189
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220818234202.451742-10-radhakrishna.sripada@intel.com

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

@@ -1382,6 +1382,9 @@ static void intel_pch_reset_handshake(struct drm_i915_private *dev_priv,
 		reset_bits = RESET_PCH_HANDSHAKE_ENABLE;
 	}
 
+	if (DISPLAY_VER(dev_priv) >= 14)
+		reset_bits |= MTL_RESET_PICA_HANDSHAKE_EN;
+
 	val = intel_de_read(dev_priv, reg);
 
 	if (enable)

drivers/gpu/drm/i915/i915_reg.h

@@ -5821,7 +5821,8 @@
 							 _BW_BUDDY1_PAGE_MASK))
 
 #define HSW_NDE_RSTWRN_OPT	_MMIO(0x46408)
-#define  RESET_PCH_HANDSHAKE_ENABLE	(1 << 4)
+#define  MTL_RESET_PICA_HANDSHAKE_EN	REG_BIT(6)
+#define  RESET_PCH_HANDSHAKE_ENABLE	REG_BIT(4)
 
 #define GEN8_CHICKEN_DCPR_1			_MMIO(0x46430)
 #define   SKL_SELECT_ALTERNATE_DC_EXIT		REG_BIT(30)