diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 97b0d4a..4ee3b58 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -298,6 +298,7 @@
 	display/icl_dsi.o \
 	display/intel_backlight.o \
 	display/intel_crt.o \
+	display/intel_cx0_phy.o \
 	display/intel_ddi.o \
 	display/intel_ddi_buf_trans.o \
 	display/intel_display_trace.o \
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.c b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
new file mode 100644
index 0000000..9ab1e68
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.c
@@ -0,0 +1,1207 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#include "i915_reg.h"
+#include "intel_cx0_phy.h"
+#include "intel_cx0_phy_regs.h"
+#include "intel_de.h"
+#include "intel_display_types.h"
+#include "intel_dp.h"
+#include "intel_panel.h"
+#include "intel_psr.h"
+#include "intel_tc.h"
+
+#define MB_WRITE_COMMITTED      true
+#define MB_WRITE_UNCOMMITTED    false
+
+#define for_each_cx0_lane_in_mask(__lane_mask, __lane) \
+	for ((__lane) = 0; (__lane) < 2; (__lane)++) \
+		for_each_if((__lane_mask) & BIT(__lane))
+
+#define INTEL_CX0_LANE0		BIT(0)
+#define INTEL_CX0_LANE1		BIT(1)
+#define INTEL_CX0_BOTH_LANES	(INTEL_CX0_LANE1 | INTEL_CX0_LANE0)
+
+bool intel_is_c10phy(struct drm_i915_private *i915, enum phy phy)
+{
+	if (IS_METEORLAKE(i915) && (phy < PHY_C))
+		return true;
+
+	return false;
+}
+
+static int lane_mask_to_lane(u8 lane_mask)
+{
+	if (WARN_ON((lane_mask & ~INTEL_CX0_BOTH_LANES) ||
+		    hweight8(lane_mask) != 1))
+		return 0;
+
+	return ilog2(lane_mask);
+}
+
+static void
+assert_dc_off(struct drm_i915_private *i915)
+{
+	bool enabled;
+
+	enabled = intel_display_power_is_enabled(i915, POWER_DOMAIN_DC_OFF);
+	drm_WARN_ON(&i915->drm, !enabled);
+}
+
+/*
+ * Prepare HW for CX0 phy transactions.
+ *
+ * It is required that PSR and DC5/6 are disabled before any CX0 message
+ * bus transaction is executed.
+ */
+static intel_wakeref_t intel_cx0_phy_transaction_begin(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+	intel_psr_pause(intel_dp);
+	return intel_display_power_get(i915, POWER_DOMAIN_DC_OFF);
+}
+
+static void intel_cx0_phy_transaction_end(struct intel_encoder *encoder, intel_wakeref_t wakeref)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+	intel_psr_resume(intel_dp);
+	intel_display_power_put(i915, POWER_DOMAIN_DC_OFF, wakeref);
+}
+
+static void intel_clear_response_ready_flag(struct drm_i915_private *i915,
+					    enum port port, int lane)
+{
+	intel_de_rmw(i915, XELPDP_PORT_P2M_MSGBUS_STATUS(port, lane),
+		     0, XELPDP_PORT_P2M_RESPONSE_READY | XELPDP_PORT_P2M_ERROR_SET);
+}
+
+static void intel_cx0_bus_reset(struct drm_i915_private *i915, enum port port, int lane)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+
+	intel_de_write(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+		       XELPDP_PORT_M2P_TRANSACTION_RESET);
+
+	if (intel_de_wait_for_clear(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+				    XELPDP_PORT_M2P_TRANSACTION_RESET,
+				    XELPDP_MSGBUS_TIMEOUT_SLOW)) {
+		drm_err_once(&i915->drm, "Failed to bring PHY %c to idle.\n", phy_name(phy));
+		return;
+	}
+
+	intel_clear_response_ready_flag(i915, port, lane);
+}
+
+static int intel_cx0_wait_for_ack(struct drm_i915_private *i915, enum port port,
+				  int command, int lane, u32 *val)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+
+	if (__intel_de_wait_for_register(i915,
+					 XELPDP_PORT_P2M_MSGBUS_STATUS(port, lane),
+					 XELPDP_PORT_P2M_RESPONSE_READY,
+					 XELPDP_PORT_P2M_RESPONSE_READY,
+					 XELPDP_MSGBUS_TIMEOUT_FAST_US,
+					 XELPDP_MSGBUS_TIMEOUT_SLOW, val)) {
+		drm_dbg_kms(&i915->drm, "PHY %c Timeout waiting for message ACK. Status: 0x%x\n",
+			    phy_name(phy), *val);
+		return -ETIMEDOUT;
+	}
+
+	if (*val & XELPDP_PORT_P2M_ERROR_SET) {
+		drm_dbg_kms(&i915->drm, "PHY %c Error occurred during %s command. Status: 0x%x\n", phy_name(phy),
+			    command == XELPDP_PORT_P2M_COMMAND_READ_ACK ? "read" : "write", *val);
+		intel_cx0_bus_reset(i915, port, lane);
+		return -EINVAL;
+	}
+
+	if (REG_FIELD_GET(XELPDP_PORT_P2M_COMMAND_TYPE_MASK, *val) != command) {
+		drm_dbg_kms(&i915->drm, "PHY %c Not a %s response. MSGBUS Status: 0x%x.\n", phy_name(phy),
+			    command == XELPDP_PORT_P2M_COMMAND_READ_ACK ? "read" : "write", *val);
+		intel_cx0_bus_reset(i915, port, lane);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int __intel_cx0_read_once(struct drm_i915_private *i915, enum port port,
+				 int lane, u16 addr)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+	int ack;
+	u32 val;
+
+	if (intel_de_wait_for_clear(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+				    XELPDP_PORT_M2P_TRANSACTION_PENDING,
+				    XELPDP_MSGBUS_TIMEOUT_SLOW)) {
+		drm_dbg_kms(&i915->drm,
+			    "PHY %c Timeout waiting for previous transaction to complete. Reset the bus and retry.\n", phy_name(phy));
+		intel_cx0_bus_reset(i915, port, lane);
+		return -ETIMEDOUT;
+	}
+
+	intel_de_write(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+		       XELPDP_PORT_M2P_TRANSACTION_PENDING |
+		       XELPDP_PORT_M2P_COMMAND_READ |
+		       XELPDP_PORT_M2P_ADDRESS(addr));
+
+	ack = intel_cx0_wait_for_ack(i915, port, XELPDP_PORT_P2M_COMMAND_READ_ACK, lane, &val);
+	if (ack < 0) {
+		intel_cx0_bus_reset(i915, port, lane);
+		return ack;
+	}
+
+	intel_clear_response_ready_flag(i915, port, lane);
+
+	return REG_FIELD_GET(XELPDP_PORT_P2M_DATA_MASK, val);
+}
+
+static u8 __intel_cx0_read(struct drm_i915_private *i915, enum port port,
+			   int lane, u16 addr)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+	int i, status;
+
+	assert_dc_off(i915);
+
+	/* 3 tries is assumed to be enough to read successfully */
+	for (i = 0; i < 3; i++) {
+		status = __intel_cx0_read_once(i915, port, lane, addr);
+
+		if (status >= 0)
+			return status;
+	}
+
+	drm_err_once(&i915->drm, "PHY %c Read %04x failed after %d retries.\n",
+		     phy_name(phy), addr, i);
+
+	return 0;
+}
+
+static u8 intel_cx0_read(struct drm_i915_private *i915, enum port port,
+			 u8 lane_mask, u16 addr)
+{
+	int lane = lane_mask_to_lane(lane_mask);
+
+	return __intel_cx0_read(i915, port, lane, addr);
+}
+
+static int __intel_cx0_write_once(struct drm_i915_private *i915, enum port port,
+				  int lane, u16 addr, u8 data, bool committed)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+	u32 val;
+
+	if (intel_de_wait_for_clear(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+				    XELPDP_PORT_M2P_TRANSACTION_PENDING,
+				    XELPDP_MSGBUS_TIMEOUT_SLOW)) {
+		drm_dbg_kms(&i915->drm,
+			    "PHY %c Timeout waiting for previous transaction to complete. Resetting the bus.\n", phy_name(phy));
+		intel_cx0_bus_reset(i915, port, lane);
+		return -ETIMEDOUT;
+	}
+
+	intel_de_write(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+		       XELPDP_PORT_M2P_TRANSACTION_PENDING |
+		       (committed ? XELPDP_PORT_M2P_COMMAND_WRITE_COMMITTED :
+				    XELPDP_PORT_M2P_COMMAND_WRITE_UNCOMMITTED) |
+		       XELPDP_PORT_M2P_DATA(data) |
+		       XELPDP_PORT_M2P_ADDRESS(addr));
+
+	if (intel_de_wait_for_clear(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+				    XELPDP_PORT_M2P_TRANSACTION_PENDING,
+				    XELPDP_MSGBUS_TIMEOUT_SLOW)) {
+		drm_dbg_kms(&i915->drm,
+			    "PHY %c Timeout waiting for write to complete. Resetting the bus.\n", phy_name(phy));
+		intel_cx0_bus_reset(i915, port, lane);
+		return -ETIMEDOUT;
+	}
+
+	if (committed) {
+		if (intel_cx0_wait_for_ack(i915, port, XELPDP_PORT_P2M_COMMAND_WRITE_ACK, lane, &val) < 0) {
+			intel_cx0_bus_reset(i915, port, lane);
+			return -EINVAL;
+		}
+	} else if ((intel_de_read(i915, XELPDP_PORT_P2M_MSGBUS_STATUS(port, lane)) &
+		    XELPDP_PORT_P2M_ERROR_SET)) {
+		drm_dbg_kms(&i915->drm,
+			    "PHY %c Error occurred during write command.\n", phy_name(phy));
+		intel_cx0_bus_reset(i915, port, lane);
+		return -EINVAL;
+	}
+
+	intel_clear_response_ready_flag(i915, port, lane);
+
+	return 0;
+}
+
+static void __intel_cx0_write(struct drm_i915_private *i915, enum port port,
+			      int lane, u16 addr, u8 data, bool committed)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+	int i, status;
+
+	assert_dc_off(i915);
+
+	/* 3 tries is assumed to be enough to write successfully */
+	for (i = 0; i < 3; i++) {
+		status = __intel_cx0_write_once(i915, port, lane, addr, data, committed);
+
+		if (status == 0)
+			return;
+	}
+
+	drm_err_once(&i915->drm,
+		     "PHY %c Write %04x failed after %d retries.\n", phy_name(phy), addr, i);
+}
+
+static void intel_cx0_write(struct drm_i915_private *i915, enum port port,
+			    u8 lane_mask, u16 addr, u8 data, bool committed)
+{
+	int lane;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		__intel_cx0_write(i915, port, lane, addr, data, committed);
+}
+
+static void __intel_cx0_rmw(struct drm_i915_private *i915, enum port port,
+			    int lane, u16 addr, u8 clear, u8 set, bool committed)
+{
+	u8 old, val;
+
+	old = __intel_cx0_read(i915, port, lane, addr);
+	val = (old & ~clear) | set;
+
+	if (val != old)
+		__intel_cx0_write(i915, port, lane, addr, val, committed);
+}
+
+static void intel_cx0_rmw(struct drm_i915_private *i915, enum port port,
+			  u8 lane_mask, u16 addr, u8 clear, u8 set, bool committed)
+{
+	u8 lane;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		__intel_cx0_rmw(i915, port, lane, addr, clear, set, committed);
+}
+
+/*
+ * Basic DP link rates with 38.4 MHz reference clock.
+ * Note: The tables below are with SSC. In non-ssc
+ * registers 0xC04 to 0xC08(pll[4] to pll[8]) will be
+ * programmed 0.
+ */
+
+static const struct intel_c10pll_state mtl_c10_dp_rbr = {
+	.clock = 162000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0xB4,
+	.pll[1] = 0,
+	.pll[2] = 0x30,
+	.pll[3] = 0x1,
+	.pll[4] = 0x26,
+	.pll[5] = 0x0C,
+	.pll[6] = 0x98,
+	.pll[7] = 0x46,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0xC0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0x2,
+	.pll[16] = 0x84,
+	.pll[17] = 0x4F,
+	.pll[18] = 0xE5,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_edp_r216 = {
+	.clock = 216000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0x4,
+	.pll[1] = 0,
+	.pll[2] = 0xA2,
+	.pll[3] = 0x1,
+	.pll[4] = 0x33,
+	.pll[5] = 0x10,
+	.pll[6] = 0x75,
+	.pll[7] = 0xB3,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0x2,
+	.pll[16] = 0x85,
+	.pll[17] = 0x0F,
+	.pll[18] = 0xE6,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_edp_r243 = {
+	.clock = 243000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0x34,
+	.pll[1] = 0,
+	.pll[2] = 0xDA,
+	.pll[3] = 0x1,
+	.pll[4] = 0x39,
+	.pll[5] = 0x12,
+	.pll[6] = 0xE3,
+	.pll[7] = 0xE9,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0x20,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0x2,
+	.pll[16] = 0x85,
+	.pll[17] = 0x8F,
+	.pll[18] = 0xE6,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_dp_hbr1 = {
+	.clock = 270000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0xF4,
+	.pll[1] = 0,
+	.pll[2] = 0xF8,
+	.pll[3] = 0x0,
+	.pll[4] = 0x20,
+	.pll[5] = 0x0A,
+	.pll[6] = 0x29,
+	.pll[7] = 0x10,
+	.pll[8] = 0x1,   /* Verify */
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0xA0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0x1,
+	.pll[16] = 0x84,
+	.pll[17] = 0x4F,
+	.pll[18] = 0xE5,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_edp_r324 = {
+	.clock = 324000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0xB4,
+	.pll[1] = 0,
+	.pll[2] = 0x30,
+	.pll[3] = 0x1,
+	.pll[4] = 0x26,
+	.pll[5] = 0x0C,
+	.pll[6] = 0x98,
+	.pll[7] = 0x46,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0xC0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0x1,
+	.pll[16] = 0x85,
+	.pll[17] = 0x4F,
+	.pll[18] = 0xE6,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_edp_r432 = {
+	.clock = 432000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0x4,
+	.pll[1] = 0,
+	.pll[2] = 0xA2,
+	.pll[3] = 0x1,
+	.pll[4] = 0x33,
+	.pll[5] = 0x10,
+	.pll[6] = 0x75,
+	.pll[7] = 0xB3,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0x1,
+	.pll[16] = 0x85,
+	.pll[17] = 0x0F,
+	.pll[18] = 0xE6,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_dp_hbr2 = {
+	.clock = 540000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0xF4,
+	.pll[1] = 0,
+	.pll[2] = 0xF8,
+	.pll[3] = 0,
+	.pll[4] = 0x20,
+	.pll[5] = 0x0A,
+	.pll[6] = 0x29,
+	.pll[7] = 0x10,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0xA0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0,
+	.pll[16] = 0x84,
+	.pll[17] = 0x4F,
+	.pll[18] = 0xE5,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_edp_r675 = {
+	.clock = 675000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0xB4,
+	.pll[1] = 0,
+	.pll[2] = 0x3E,
+	.pll[3] = 0x1,
+	.pll[4] = 0xA8,
+	.pll[5] = 0x0C,
+	.pll[6] = 0x33,
+	.pll[7] = 0x54,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0xC8,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0,
+	.pll[16] = 0x85,
+	.pll[17] = 0x8F,
+	.pll[18] = 0xE6,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state mtl_c10_dp_hbr3 = {
+	.clock = 810000,
+	.tx = 0x10,
+	.cmn = 0x21,
+	.pll[0] = 0x34,
+	.pll[1] = 0,
+	.pll[2] = 0x84,
+	.pll[3] = 0x1,
+	.pll[4] = 0x30,
+	.pll[5] = 0x0F,
+	.pll[6] = 0x3D,
+	.pll[7] = 0x98,
+	.pll[8] = 0x1,
+	.pll[9] = 0x1,
+	.pll[10] = 0,
+	.pll[11] = 0,
+	.pll[12] = 0xF0,
+	.pll[13] = 0,
+	.pll[14] = 0,
+	.pll[15] = 0,
+	.pll[16] = 0x84,
+	.pll[17] = 0x0F,
+	.pll[18] = 0xE5,
+	.pll[19] = 0x23,
+};
+
+static const struct intel_c10pll_state * const mtl_c10_dp_tables[] = {
+	&mtl_c10_dp_rbr,
+	&mtl_c10_dp_hbr1,
+	&mtl_c10_dp_hbr2,
+	&mtl_c10_dp_hbr3,
+	NULL,
+};
+
+static const struct intel_c10pll_state * const mtl_c10_edp_tables[] = {
+	&mtl_c10_dp_rbr,
+	&mtl_c10_edp_r216,
+	&mtl_c10_edp_r243,
+	&mtl_c10_dp_hbr1,
+	&mtl_c10_edp_r324,
+	&mtl_c10_edp_r432,
+	&mtl_c10_dp_hbr2,
+	&mtl_c10_edp_r675,
+	&mtl_c10_dp_hbr3,
+	NULL,
+};
+
+static const struct intel_c10pll_state * const *
+intel_c10pll_tables_get(struct intel_crtc_state *crtc_state,
+			struct intel_encoder *encoder)
+{
+	if (intel_crtc_has_dp_encoder(crtc_state)) {
+		if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_EDP))
+			return mtl_c10_edp_tables;
+		else
+			return mtl_c10_dp_tables;
+	}
+
+	/* TODO: Add HDMI Support */
+	MISSING_CASE(encoder->type);
+	return NULL;
+}
+
+static void intel_c10pll_update_pll(struct intel_crtc_state *crtc_state,
+				    struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	struct intel_cx0pll_state *pll_state = &crtc_state->cx0pll_state;
+	int i;
+
+	if (intel_crtc_has_dp_encoder(crtc_state)) {
+		if (intel_panel_use_ssc(i915)) {
+			struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+
+			pll_state->ssc_enabled =
+				(intel_dp->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5);
+		}
+	}
+
+	if (pll_state->ssc_enabled)
+		return;
+
+	drm_WARN_ON(&i915->drm, ARRAY_SIZE(pll_state->c10.pll) < 9);
+	for (i = 4; i < 9; i++)
+		pll_state->c10.pll[i] = 0;
+}
+
+static int intel_c10pll_calc_state(struct intel_crtc_state *crtc_state,
+				   struct intel_encoder *encoder)
+{
+	const struct intel_c10pll_state * const *tables;
+	int i;
+
+	tables = intel_c10pll_tables_get(crtc_state, encoder);
+	if (!tables)
+		return -EINVAL;
+
+	for (i = 0; tables[i]; i++) {
+		if (crtc_state->port_clock == tables[i]->clock) {
+			crtc_state->cx0pll_state.c10 = *tables[i];
+			intel_c10pll_update_pll(crtc_state, encoder);
+
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+int intel_cx0pll_calc_state(struct intel_crtc_state *crtc_state,
+			    struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+
+	drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
+
+	return intel_c10pll_calc_state(crtc_state, encoder);
+}
+
+void intel_c10pll_readout_hw_state(struct intel_encoder *encoder,
+				   struct intel_c10pll_state *pll_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	u8 lane = INTEL_CX0_LANE0;
+	intel_wakeref_t wakeref;
+	int i;
+
+	wakeref = intel_cx0_phy_transaction_begin(encoder);
+
+	/*
+	 * According to C10 VDR Register programming Sequence we need
+	 * to do this to read PHY internal registers from MsgBus.
+	 */
+	intel_cx0_rmw(i915, encoder->port, lane, PHY_C10_VDR_CONTROL(1),
+		      0, C10_VDR_CTRL_MSGBUS_ACCESS,
+		      MB_WRITE_COMMITTED);
+
+	for (i = 0; i < ARRAY_SIZE(pll_state->pll); i++)
+		pll_state->pll[i] = intel_cx0_read(i915, encoder->port, lane,
+						   PHY_C10_VDR_PLL(i));
+
+	pll_state->cmn = intel_cx0_read(i915, encoder->port, lane, PHY_C10_VDR_CMN(0));
+	pll_state->tx = intel_cx0_read(i915, encoder->port, lane, PHY_C10_VDR_TX(0));
+
+	intel_cx0_phy_transaction_end(encoder, wakeref);
+}
+
+static void intel_c10_pll_program(struct drm_i915_private *i915,
+				  const struct intel_crtc_state *crtc_state,
+				  struct intel_encoder *encoder)
+{
+	const struct intel_c10pll_state *pll_state = &crtc_state->cx0pll_state.c10;
+	int i;
+
+	intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
+		      0, C10_VDR_CTRL_MSGBUS_ACCESS,
+		      MB_WRITE_COMMITTED);
+	/* Custom width needs to be programmed to 0 for both the phy lanes */
+	intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CUSTOM_WIDTH,
+		      C10_VDR_CUSTOM_WIDTH_MASK, C10_VDR_CUSTOM_WIDTH_8_10,
+		      MB_WRITE_COMMITTED);
+	intel_cx0_rmw(i915, encoder->port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
+		      0, C10_VDR_CTRL_UPDATE_CFG,
+		      MB_WRITE_COMMITTED);
+
+	/* Program the pll values only for the master lane */
+	for (i = 0; i < ARRAY_SIZE(pll_state->pll); i++)
+		intel_cx0_write(i915, encoder->port, INTEL_CX0_LANE0, PHY_C10_VDR_PLL(i),
+				pll_state->pll[i],
+				(i % 4) ? MB_WRITE_UNCOMMITTED : MB_WRITE_COMMITTED);
+
+	intel_cx0_write(i915, encoder->port, INTEL_CX0_LANE0, PHY_C10_VDR_CMN(0), pll_state->cmn, MB_WRITE_COMMITTED);
+	intel_cx0_write(i915, encoder->port, INTEL_CX0_LANE0, PHY_C10_VDR_TX(0), pll_state->tx, MB_WRITE_COMMITTED);
+
+	intel_cx0_rmw(i915, encoder->port, INTEL_CX0_LANE0, PHY_C10_VDR_CONTROL(1),
+		      0, C10_VDR_CTRL_MASTER_LANE | C10_VDR_CTRL_UPDATE_CFG,
+		      MB_WRITE_COMMITTED);
+}
+
+void intel_c10pll_dump_hw_state(struct drm_i915_private *i915,
+				const struct intel_c10pll_state *hw_state)
+{
+	bool fracen;
+	int i;
+	unsigned int frac_quot = 0, frac_rem = 0, frac_den = 1;
+	unsigned int multiplier, tx_clk_div;
+
+	fracen = hw_state->pll[0] & C10_PLL0_FRACEN;
+	drm_dbg_kms(&i915->drm, "c10pll_hw_state: fracen: %s, ",
+		    str_yes_no(fracen));
+
+	if (fracen) {
+		frac_quot = hw_state->pll[12] << 8 | hw_state->pll[11];
+		frac_rem =  hw_state->pll[14] << 8 | hw_state->pll[13];
+		frac_den =  hw_state->pll[10] << 8 | hw_state->pll[9];
+		drm_dbg_kms(&i915->drm, "quot: %u, rem: %u, den: %u,\n",
+			    frac_quot, frac_rem, frac_den);
+	}
+
+	multiplier = (REG_FIELD_GET8(C10_PLL3_MULTIPLIERH_MASK, hw_state->pll[3]) << 8 |
+		      hw_state->pll[2]) / 2 + 16;
+	tx_clk_div = REG_FIELD_GET8(C10_PLL15_TXCLKDIV_MASK, hw_state->pll[15]);
+	drm_dbg_kms(&i915->drm,
+		    "multiplier: %u, tx_clk_div: %u.\n", multiplier, tx_clk_div);
+
+	drm_dbg_kms(&i915->drm, "c10pll_rawhw_state:");
+	drm_dbg_kms(&i915->drm, "tx: 0x%x, cmn: 0x%x\n", hw_state->tx, hw_state->cmn);
+
+	BUILD_BUG_ON(ARRAY_SIZE(hw_state->pll) % 4);
+	for (i = 0; i < ARRAY_SIZE(hw_state->pll); i = i + 4)
+		drm_dbg_kms(&i915->drm, "pll[%d] = 0x%x, pll[%d] = 0x%x, pll[%d] = 0x%x, pll[%d] = 0x%x\n",
+			    i, hw_state->pll[i], i + 1, hw_state->pll[i + 1],
+			    i + 2, hw_state->pll[i + 2], i + 3, hw_state->pll[i + 3]);
+}
+
+int intel_c10pll_calc_port_clock(struct intel_encoder *encoder,
+				 const struct intel_c10pll_state *pll_state)
+{
+	unsigned int frac_quot = 0, frac_rem = 0, frac_den = 1;
+	unsigned int multiplier, tx_clk_div, refclk = 38400;
+
+	if (pll_state->pll[0] & C10_PLL0_FRACEN) {
+		frac_quot = pll_state->pll[12] << 8 | pll_state->pll[11];
+		frac_rem =  pll_state->pll[14] << 8 | pll_state->pll[13];
+		frac_den =  pll_state->pll[10] << 8 | pll_state->pll[9];
+	}
+
+	multiplier = (REG_FIELD_GET8(C10_PLL3_MULTIPLIERH_MASK, pll_state->pll[3]) << 8 |
+		      pll_state->pll[2]) / 2 + 16;
+
+	tx_clk_div = REG_FIELD_GET8(C10_PLL15_TXCLKDIV_MASK, pll_state->pll[15]);
+
+	return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(refclk, (multiplier << 16) + frac_quot) +
+				     DIV_ROUND_CLOSEST(refclk * frac_rem, frac_den),
+				     10 << (tx_clk_div + 16));
+}
+
+static void intel_program_port_clock_ctl(struct intel_encoder *encoder,
+					 const struct intel_crtc_state *crtc_state,
+					 bool lane_reversal)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	u32 val = 0;
+
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL1(encoder->port), XELPDP_PORT_REVERSAL,
+		     lane_reversal ? XELPDP_PORT_REVERSAL : 0);
+
+	if (lane_reversal)
+		val |= XELPDP_LANE1_PHY_CLOCK_SELECT;
+
+	val |= XELPDP_FORWARD_CLOCK_UNGATE;
+	val |= XELPDP_DDI_CLOCK_SELECT(XELPDP_DDI_CLOCK_SELECT_MAXPCLK);
+
+	/* TODO: HDMI FRL */
+	/* TODO: DP2.0 10G and 20G rates enable MPLLA*/
+	val |= crtc_state->cx0pll_state.ssc_enabled ? XELPDP_SSC_ENABLE_PLLB : 0;
+
+	intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+		     XELPDP_LANE1_PHY_CLOCK_SELECT |
+		     XELPDP_FORWARD_CLOCK_UNGATE |
+		     XELPDP_DDI_CLOCK_SELECT_MASK |
+		     XELPDP_SSC_ENABLE_PLLB, val);
+}
+
+static u32 intel_cx0_get_powerdown_update(u8 lane_mask)
+{
+	u32 val = 0;
+	int lane = 0;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		val |= XELPDP_LANE_POWERDOWN_UPDATE(lane);
+
+	return val;
+}
+
+static u32 intel_cx0_get_powerdown_state(u8 lane_mask, u8 state)
+{
+	u32 val = 0;
+	int lane = 0;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		val |= XELPDP_LANE_POWERDOWN_NEW_STATE(lane, state);
+
+	return val;
+}
+
+static void intel_cx0_powerdown_change_sequence(struct drm_i915_private *i915,
+						enum port port,
+						u8 lane_mask, u8 state)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+	int lane;
+
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port),
+		     intel_cx0_get_powerdown_state(INTEL_CX0_BOTH_LANES, XELPDP_LANE_POWERDOWN_NEW_STATE_MASK),
+		     intel_cx0_get_powerdown_state(lane_mask, state));
+
+	/* Wait for pending transactions.*/
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		if (intel_de_wait_for_clear(i915, XELPDP_PORT_M2P_MSGBUS_CTL(port, lane),
+					    XELPDP_PORT_M2P_TRANSACTION_PENDING,
+					    XELPDP_MSGBUS_TIMEOUT_SLOW)) {
+			drm_dbg_kms(&i915->drm,
+				    "PHY %c Timeout waiting for previous transaction to complete. Reset the bus.\n",
+				    phy_name(phy));
+			intel_cx0_bus_reset(i915, port, lane);
+		}
+
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port),
+		     intel_cx0_get_powerdown_update(INTEL_CX0_BOTH_LANES),
+		     intel_cx0_get_powerdown_update(lane_mask));
+
+	/* Update Timeout Value */
+	if (__intel_de_wait_for_register(i915, XELPDP_PORT_BUF_CTL2(port),
+					 intel_cx0_get_powerdown_update(lane_mask), 0,
+					 XELPDP_PORT_POWERDOWN_UPDATE_TIMEOUT_US, 0, NULL))
+		drm_warn(&i915->drm, "PHY %c failed to bring out of Lane reset after %dus.\n",
+			 phy_name(phy), XELPDP_PORT_RESET_START_TIMEOUT_US);
+}
+
+static void intel_cx0_setup_powerdown(struct drm_i915_private *i915, enum port port)
+{
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port),
+		     XELPDP_POWER_STATE_READY_MASK,
+		     XELPDP_POWER_STATE_READY(CX0_P2_STATE_READY));
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL3(port),
+		     XELPDP_POWER_STATE_ACTIVE_MASK |
+		     XELPDP_PLL_LANE_STAGGERING_DELAY_MASK,
+		     XELPDP_POWER_STATE_ACTIVE(CX0_P0_STATE_ACTIVE) |
+		     XELPDP_PLL_LANE_STAGGERING_DELAY(0));
+}
+
+static u32 intel_cx0_get_pclk_refclk_request(u8 lane_mask)
+{
+	u32 val = 0;
+	int lane = 0;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		val |= XELPDP_LANE_PCLK_REFCLK_REQUEST(lane);
+
+	return val;
+}
+
+static u32 intel_cx0_get_pclk_refclk_ack(u8 lane_mask)
+{
+	u32 val = 0;
+	int lane = 0;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		val |= XELPDP_LANE_PCLK_REFCLK_ACK(lane);
+
+	return val;
+}
+
+/* FIXME: Some Type-C cases need not reset both the lanes. Handle those cases. */
+static void intel_cx0_phy_lane_reset(struct drm_i915_private *i915, enum port port,
+				     bool lane_reversal)
+{
+	enum phy phy = intel_port_to_phy(i915, port);
+	u8 lane_mask = lane_reversal ? INTEL_CX0_LANE1 :
+				  INTEL_CX0_LANE0;
+
+	if (__intel_de_wait_for_register(i915, XELPDP_PORT_BUF_CTL1(port),
+					 XELPDP_PORT_BUF_SOC_PHY_READY,
+					 XELPDP_PORT_BUF_SOC_PHY_READY,
+					 XELPDP_PORT_BUF_SOC_READY_TIMEOUT_US, 0, NULL))
+		drm_warn(&i915->drm, "PHY %c failed to bring out of SOC reset after %dus.\n",
+			 phy_name(phy), XELPDP_PORT_BUF_SOC_READY_TIMEOUT_US);
+
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port),
+		     XELPDP_LANE_PIPE_RESET(0) | XELPDP_LANE_PIPE_RESET(1),
+		     XELPDP_LANE_PIPE_RESET(0) | XELPDP_LANE_PIPE_RESET(1));
+
+	if (__intel_de_wait_for_register(i915, XELPDP_PORT_BUF_CTL2(port),
+					 XELPDP_LANE_PHY_CURRENT_STATUS(0) |
+					 XELPDP_LANE_PHY_CURRENT_STATUS(1),
+					 XELPDP_LANE_PHY_CURRENT_STATUS(0) |
+					 XELPDP_LANE_PHY_CURRENT_STATUS(1),
+					 XELPDP_PORT_RESET_START_TIMEOUT_US, 0, NULL))
+		drm_warn(&i915->drm, "PHY %c failed to bring out of Lane reset after %dus.\n",
+			 phy_name(phy), XELPDP_PORT_RESET_START_TIMEOUT_US);
+
+	intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(port),
+		     intel_cx0_get_pclk_refclk_request(INTEL_CX0_BOTH_LANES),
+		     intel_cx0_get_pclk_refclk_request(lane_mask));
+
+	if (__intel_de_wait_for_register(i915, XELPDP_PORT_CLOCK_CTL(port),
+					 intel_cx0_get_pclk_refclk_ack(INTEL_CX0_BOTH_LANES),
+					 intel_cx0_get_pclk_refclk_ack(lane_mask),
+					 XELPDP_REFCLK_ENABLE_TIMEOUT_US, 0, NULL))
+		drm_warn(&i915->drm, "PHY %c failed to request refclk after %dus.\n",
+			 phy_name(phy), XELPDP_REFCLK_ENABLE_TIMEOUT_US);
+
+	intel_cx0_powerdown_change_sequence(i915, port, INTEL_CX0_BOTH_LANES,
+					    CX0_P2_STATE_RESET);
+	intel_cx0_setup_powerdown(i915, port);
+
+	intel_de_rmw(i915, XELPDP_PORT_BUF_CTL2(port),
+		     XELPDP_LANE_PIPE_RESET(0) | XELPDP_LANE_PIPE_RESET(1),
+		     0);
+
+	if (intel_de_wait_for_clear(i915, XELPDP_PORT_BUF_CTL2(port),
+				    XELPDP_LANE_PHY_CURRENT_STATUS(0) |
+				    XELPDP_LANE_PHY_CURRENT_STATUS(1),
+				    XELPDP_PORT_RESET_END_TIMEOUT))
+		drm_warn(&i915->drm, "PHY %c failed to bring out of Lane reset after %dms.\n",
+			 phy_name(phy), XELPDP_PORT_RESET_END_TIMEOUT);
+}
+
+static void intel_c10_program_phy_lane(struct drm_i915_private *i915,
+				       struct intel_encoder *encoder, int lane_count,
+				       bool lane_reversal)
+{
+	u8 l0t1, l0t2, l1t1, l1t2;
+	bool dp_alt_mode = intel_tc_port_in_dp_alt_mode(enc_to_dig_port(encoder));
+	enum port port = encoder->port;
+
+	intel_cx0_rmw(i915, port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
+		      0, C10_VDR_CTRL_MSGBUS_ACCESS,
+		      MB_WRITE_COMMITTED);
+
+	/* TODO: DP-alt MFD case where only one PHY lane should be programmed. */
+	l0t1 = intel_cx0_read(i915, port, INTEL_CX0_LANE0, PHY_CX0_TX_CONTROL(1, 2));
+	l0t2 = intel_cx0_read(i915, port, INTEL_CX0_LANE0, PHY_CX0_TX_CONTROL(2, 2));
+	l1t1 = intel_cx0_read(i915, port, INTEL_CX0_LANE1, PHY_CX0_TX_CONTROL(1, 2));
+	l1t2 = intel_cx0_read(i915, port, INTEL_CX0_LANE1, PHY_CX0_TX_CONTROL(2, 2));
+
+	l0t1 |= CONTROL2_DISABLE_SINGLE_TX;
+	l0t2 |= CONTROL2_DISABLE_SINGLE_TX;
+	l1t1 |= CONTROL2_DISABLE_SINGLE_TX;
+	l1t2 |= CONTROL2_DISABLE_SINGLE_TX;
+
+	if (lane_reversal) {
+		switch (lane_count) {
+		case 4:
+			l0t1 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			fallthrough;
+		case 3:
+			l0t2 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			fallthrough;
+		case 2:
+			l1t1 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			fallthrough;
+		case 1:
+			l1t2 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			break;
+		default:
+			MISSING_CASE(lane_count);
+		}
+	} else {
+		switch (lane_count) {
+		case 4:
+			l1t2 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			fallthrough;
+		case 3:
+			l1t1 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			fallthrough;
+		case 2:
+			l0t2 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			l0t1 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			break;
+		case 1:
+			if (dp_alt_mode)
+				l0t2 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			else
+				l0t1 &= ~CONTROL2_DISABLE_SINGLE_TX;
+			break;
+		default:
+			MISSING_CASE(lane_count);
+		}
+	}
+
+	/* disable MLs */
+	intel_cx0_write(i915, port, INTEL_CX0_LANE0, PHY_CX0_TX_CONTROL(1, 2),
+			l0t1, MB_WRITE_COMMITTED);
+	intel_cx0_write(i915, port, INTEL_CX0_LANE0, PHY_CX0_TX_CONTROL(2, 2),
+			l0t2, MB_WRITE_COMMITTED);
+	intel_cx0_write(i915, port, INTEL_CX0_LANE1, PHY_CX0_TX_CONTROL(1, 2),
+			l1t1, MB_WRITE_COMMITTED);
+	intel_cx0_write(i915, port, INTEL_CX0_LANE1, PHY_CX0_TX_CONTROL(2, 2),
+			l1t2, MB_WRITE_COMMITTED);
+
+	intel_cx0_rmw(i915, port, INTEL_CX0_BOTH_LANES, PHY_C10_VDR_CONTROL(1),
+		      0, C10_VDR_CTRL_UPDATE_CFG,
+		      MB_WRITE_COMMITTED);
+}
+
+static u32 intel_cx0_get_pclk_pll_request(u8 lane_mask)
+{
+	u32 val = 0;
+	int lane = 0;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		val |= XELPDP_LANE_PCLK_PLL_REQUEST(lane);
+
+	return val;
+}
+
+static u32 intel_cx0_get_pclk_pll_ack(u8 lane_mask)
+{
+	u32 val = 0;
+	int lane = 0;
+
+	for_each_cx0_lane_in_mask(lane_mask, lane)
+		val |= XELPDP_LANE_PCLK_PLL_ACK(lane);
+
+	return val;
+}
+
+static void intel_c10pll_enable(struct intel_encoder *encoder,
+				const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+	struct intel_digital_port *dig_port = enc_to_dig_port(encoder);
+	bool lane_reversal = dig_port->saved_port_bits & DDI_BUF_PORT_REVERSAL;
+	u8 maxpclk_lane = lane_reversal ? INTEL_CX0_LANE1 :
+					  INTEL_CX0_LANE0;
+
+	/*
+	 * 1. Program PORT_CLOCK_CTL REGISTER to configure
+	 * clock muxes, gating and SSC
+	 */
+	intel_program_port_clock_ctl(encoder, crtc_state, lane_reversal);
+
+	/* 2. Bring PHY out of reset. */
+	intel_cx0_phy_lane_reset(i915, encoder->port, lane_reversal);
+
+	/*
+	 * 3. Change Phy power state to Ready.
+	 * TODO: For DP alt mode use only one lane.
+	 */
+	intel_cx0_powerdown_change_sequence(i915, encoder->port, INTEL_CX0_BOTH_LANES,
+					    CX0_P2_STATE_READY);
+
+	/* 4. Program PHY internal PLL internal registers. */
+	intel_c10_pll_program(i915, crtc_state, encoder);
+
+	/*
+	 * 5. Program the enabled and disabled owned PHY lane
+	 * transmitters over message bus
+	 */
+	intel_c10_program_phy_lane(i915, encoder, crtc_state->lane_count, lane_reversal);
+
+	/*
+	 * 6. Follow the Display Voltage Frequency Switching - Sequence
+	 * Before Frequency Change. We handle this step in bxt_set_cdclk().
+	 */
+
+	/*
+	 * 7. Program DDI_CLK_VALFREQ to match intended DDI
+	 * clock frequency.
+	 */
+	intel_de_write(i915, DDI_CLK_VALFREQ(encoder->port),
+		       crtc_state->port_clock);
+
+	/*
+	 * 8. Set PORT_CLOCK_CTL register PCLK PLL Request
+	 * LN<Lane for maxPCLK> to "1" to enable PLL.
+	 */
+	intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+		     intel_cx0_get_pclk_pll_request(INTEL_CX0_BOTH_LANES),
+		     intel_cx0_get_pclk_pll_request(maxpclk_lane));
+
+	/* 9. Poll on PORT_CLOCK_CTL PCLK PLL Ack LN<Lane for maxPCLK> == "1". */
+	if (__intel_de_wait_for_register(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+					 intel_cx0_get_pclk_pll_ack(INTEL_CX0_BOTH_LANES),
+					 intel_cx0_get_pclk_pll_ack(maxpclk_lane),
+					 XELPDP_PCLK_PLL_ENABLE_TIMEOUT_US, 0, NULL))
+		drm_warn(&i915->drm, "Port %c PLL not locked after %dus.\n",
+			 phy_name(phy), XELPDP_PCLK_PLL_ENABLE_TIMEOUT_US);
+
+	/*
+	 * 10. Follow the Display Voltage Frequency Switching Sequence After
+	 * Frequency Change. We handle this step in bxt_set_cdclk().
+	 */
+}
+
+void intel_cx0pll_enable(struct intel_encoder *encoder,
+			 const struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+	intel_wakeref_t wakeref;
+
+	wakeref = intel_cx0_phy_transaction_begin(encoder);
+
+	drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
+	intel_c10pll_enable(encoder, crtc_state);
+
+	/* TODO: enable TBT-ALT mode */
+	intel_cx0_phy_transaction_end(encoder, wakeref);
+}
+
+static void intel_c10pll_disable(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+
+	/* 1. Change owned PHY lane power to Disable state. */
+	intel_cx0_powerdown_change_sequence(i915, encoder->port, INTEL_CX0_BOTH_LANES,
+					    CX0_P2PG_STATE_DISABLE);
+
+	/*
+	 * 2. Follow the Display Voltage Frequency Switching Sequence Before
+	 * Frequency Change. We handle this step in bxt_set_cdclk().
+	 */
+
+	/*
+	 * 3. Set PORT_CLOCK_CTL register PCLK PLL Request LN<Lane for maxPCLK>
+	 * to "0" to disable PLL.
+	 */
+	intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+		     intel_cx0_get_pclk_pll_request(INTEL_CX0_BOTH_LANES) |
+		     intel_cx0_get_pclk_refclk_request(INTEL_CX0_BOTH_LANES), 0);
+
+	/* 4. Program DDI_CLK_VALFREQ to 0. */
+	intel_de_write(i915, DDI_CLK_VALFREQ(encoder->port), 0);
+
+	/*
+	 * 5. Poll on PORT_CLOCK_CTL PCLK PLL Ack LN<Lane for maxPCLK**> == "0".
+	 */
+	if (__intel_de_wait_for_register(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+					 intel_cx0_get_pclk_pll_ack(INTEL_CX0_BOTH_LANES) |
+					 intel_cx0_get_pclk_refclk_ack(INTEL_CX0_BOTH_LANES), 0,
+					 XELPDP_PCLK_PLL_DISABLE_TIMEOUT_US, 0, NULL))
+		drm_warn(&i915->drm, "Port %c PLL not unlocked after %dus.\n",
+			 phy_name(phy), XELPDP_PCLK_PLL_DISABLE_TIMEOUT_US);
+
+	/*
+	 * 6. Follow the Display Voltage Frequency Switching Sequence After
+	 * Frequency Change. We handle this step in bxt_set_cdclk().
+	 */
+
+	/* 7. Program PORT_CLOCK_CTL register to disable and gate clocks. */
+	intel_de_rmw(i915, XELPDP_PORT_CLOCK_CTL(encoder->port),
+		     XELPDP_DDI_CLOCK_SELECT_MASK |
+		     XELPDP_FORWARD_CLOCK_UNGATE, 0);
+}
+
+void intel_cx0pll_disable(struct intel_encoder *encoder)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+	intel_wakeref_t wakeref;
+
+	wakeref = intel_cx0_phy_transaction_begin(encoder);
+
+	drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
+	intel_c10pll_disable(encoder);
+	intel_cx0_phy_transaction_end(encoder, wakeref);
+}
+
+void intel_c10pll_state_verify(struct intel_atomic_state *state,
+			       struct intel_crtc_state *new_crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_c10pll_state mpllb_hw_state = { 0 };
+	struct intel_c10pll_state *mpllb_sw_state = &new_crtc_state->cx0pll_state.c10;
+	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
+	struct intel_encoder *encoder;
+	enum phy phy;
+	int i;
+
+	if (DISPLAY_VER(i915) < 14)
+		return;
+
+	if (!new_crtc_state->hw.active)
+		return;
+
+	encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
+	phy = intel_port_to_phy(i915, encoder->port);
+
+	if (!intel_is_c10phy(i915, phy))
+		return;
+
+	intel_c10pll_readout_hw_state(encoder, &mpllb_hw_state);
+
+	for (i = 0; i < ARRAY_SIZE(mpllb_sw_state->pll); i++) {
+		u8 expected = mpllb_sw_state->pll[i];
+
+		I915_STATE_WARN(mpllb_hw_state.pll[i] != expected,
+				"[CRTC:%d:%s] mismatch in C10MPLLB: Register[%d] (expected 0x%02x, found 0x%02x)",
+				crtc->base.base.id, crtc->base.name,
+				i, expected, mpllb_hw_state.pll[i]);
+	}
+
+	I915_STATE_WARN(mpllb_hw_state.tx != mpllb_sw_state->tx,
+			"[CRTC:%d:%s] mismatch in C10MPLLB: Register TX0 (expected 0x%02x, found 0x%02x)",
+			crtc->base.base.id, crtc->base.name,
+			mpllb_sw_state->tx, mpllb_hw_state.tx);
+
+	I915_STATE_WARN(mpllb_hw_state.cmn != mpllb_sw_state->cmn,
+			"[CRTC:%d:%s] mismatch in C10MPLLB: Register CMN0 (expected 0x%02x, found 0x%02x)",
+			crtc->base.base.id, crtc->base.name,
+			mpllb_sw_state->cmn, mpllb_hw_state.cmn);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy.h b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
new file mode 100644
index 0000000..46fa057
--- /dev/null
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy.h
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2023 Intel Corporation
+ */
+
+#ifndef __INTEL_CX0_PHY_H__
+#define __INTEL_CX0_PHY_H__
+
+#include <linux/types.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+
+#include "i915_drv.h"
+#include "intel_display_types.h"
+
+struct drm_i915_private;
+struct intel_encoder;
+struct intel_crtc_state;
+enum phy;
+
+bool intel_is_c10phy(struct drm_i915_private *dev_priv, enum phy phy);
+void intel_cx0pll_enable(struct intel_encoder *encoder,
+			 const struct intel_crtc_state *crtc_state);
+void intel_cx0pll_disable(struct intel_encoder *encoder);
+void intel_c10pll_readout_hw_state(struct intel_encoder *encoder, struct intel_c10pll_state *pll_state);
+int intel_cx0pll_calc_state(struct intel_crtc_state *crtc_state, struct intel_encoder *encoder);
+void intel_c10pll_dump_hw_state(struct drm_i915_private *dev_priv,
+				const struct intel_c10pll_state *hw_state);
+int intel_c10pll_calc_port_clock(struct intel_encoder *encoder,
+				 const struct intel_c10pll_state *pll_state);
+void intel_c10pll_state_verify(struct intel_atomic_state *state,
+			       struct intel_crtc_state *new_crtc_state);
+
+#endif /* __INTEL_CX0_PHY_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h b/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
index 916002a..21a699c 100644
--- a/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_cx0_phy_regs.h
@@ -96,6 +96,11 @@
 #define   XELPDP_PLL_LANE_STAGGERING_DELAY(val)		REG_FIELD_PREP(XELPDP_PLL_LANE_STAGGERING_DELAY_MASK, val)
 #define   XELPDP_POWER_STATE_ACTIVE_MASK		REG_GENMASK(3, 0)
 #define   XELPDP_POWER_STATE_ACTIVE(val)		REG_FIELD_PREP(XELPDP_POWER_STATE_ACTIVE_MASK, val)
+#define   CX0_P0_STATE_ACTIVE				0x0
+#define   CX0_P2_STATE_READY				0x2
+#define   CX0_P2PG_STATE_DISABLE			0x9
+#define   CX0_P4PG_STATE_DISABLE			0xC
+#define   CX0_P2_STATE_RESET				0x2
 
 #define _XELPDP_PORT_CLOCK_CTL_A			0x640E0
 #define _XELPDP_PORT_CLOCK_CTL_B			0x641E0
@@ -106,14 +111,11 @@
 										 _XELPDP_PORT_CLOCK_CTL_B, \
 										 _XELPDP_PORT_CLOCK_CTL_USBC1, \
 										 _XELPDP_PORT_CLOCK_CTL_USBC2))
-#define   XELPDP_LANE0_PCLK_PLL_REQUEST			REG_BIT(31)
-#define   XELPDP_LANE0_PCLK_PLL_ACK			REG_BIT(30)
-#define   XELPDP_LANE0_PCLK_REFCLK_REQUEST		REG_BIT(29)
-#define   XELPDP_LANE0_PCLK_REFCLK_ACK			REG_BIT(28)
-#define   XELPDP_LANE1_PCLK_PLL_REQUEST			REG_BIT(27)
-#define   XELPDP_LANE1_PCLK_PLL_ACK			REG_BIT(26)
-#define   XELPDP_LANE1_PCLK_REFCLK_REQUEST		REG_BIT(25)
-#define   XELPDP_LANE1_PCLK_REFCLK_ACK			REG_BIT(24)
+#define   XELPDP_LANE_PCLK_PLL_REQUEST(lane)		REG_BIT(31 - ((lane) * 4))
+#define   XELPDP_LANE_PCLK_PLL_ACK(lane)		REG_BIT(30 - ((lane) * 4))
+#define   XELPDP_LANE_PCLK_REFCLK_REQUEST(lane)		REG_BIT(29 - ((lane) * 4))
+#define   XELPDP_LANE_PCLK_REFCLK_ACK(lane)		REG_BIT(28 - ((lane) * 4))
+
 #define   XELPDP_TBT_CLOCK_REQUEST			REG_BIT(19)
 #define   XELPDP_TBT_CLOCK_ACK				REG_BIT(18)
 #define   XELPDP_DDI_CLOCK_SELECT_MASK			REG_GENMASK(15, 12)
@@ -130,4 +132,31 @@
 #define   XELPDP_SSC_ENABLE_PLLA			REG_BIT(1)
 #define   XELPDP_SSC_ENABLE_PLLB			REG_BIT(0)
 
-#endif /* __INTEL_CX0_PHY_REGS_H__ */
+/* C10 Vendor Registers */
+#define PHY_C10_VDR_PLL(idx)		(0xC00 + (idx))
+#define   C10_PLL0_FRACEN		REG_BIT8(4)
+#define   C10_PLL3_MULTIPLIERH_MASK	REG_GENMASK8(3, 0)
+#define   C10_PLL15_TXCLKDIV_MASK	REG_GENMASK8(2, 0)
+#define PHY_C10_VDR_CMN(idx)		(0xC20 + (idx))
+#define   C10_CMN0_REF_RANGE		REG_FIELD_PREP(REG_GENMASK(4, 0), 1)
+#define   C10_CMN0_REF_CLK_MPLLB_DIV	REG_FIELD_PREP(REG_GENMASK(7, 5), 1)
+#define   C10_CMN3_TXVBOOST_MASK	REG_GENMASK8(7, 5)
+#define   C10_CMN3_TXVBOOST(val)	REG_FIELD_PREP8(C10_CMN3_TXVBOOST_MASK, val)
+#define PHY_C10_VDR_TX(idx)		(0xC30 + (idx))
+#define   C10_TX0_TX_MPLLB_SEL		REG_BIT(4)
+#define PHY_C10_VDR_CONTROL(idx)	(0xC70 + (idx) - 1)
+#define   C10_VDR_CTRL_MSGBUS_ACCESS	REG_BIT8(2)
+#define   C10_VDR_CTRL_MASTER_LANE	REG_BIT8(1)
+#define   C10_VDR_CTRL_UPDATE_CFG	REG_BIT8(0)
+#define PHY_C10_VDR_CUSTOM_WIDTH	0xD02
+#define   C10_VDR_CUSTOM_WIDTH_MASK    REG_GENMASK(1, 0)
+#define   C10_VDR_CUSTOM_WIDTH_8_10    REG_FIELD_PREP(C10_VDR_CUSTOM_WIDTH_MASK, 0)
+
+/* PHY_C10_VDR_PLL0 */
+#define PLL_C10_MPLL_SSC_EN             REG_BIT8(0)
+
+/* PIPE SPEC Defined Registers */
+#define PHY_CX0_TX_CONTROL(tx, control)	(0x400 + ((tx) - 1) * 0x200 + (control))
+#define   CONTROL2_DISABLE_SINGLE_TX	REG_BIT(6)
+
+#endif /* __INTEL_CX0_REG_DEFS_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index d6fb0782..de7cf77 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -39,6 +39,7 @@
 #include "intel_combo_phy_regs.h"
 #include "intel_connector.h"
 #include "intel_crtc.h"
+#include "intel_cx0_phy.h"
 #include "intel_ddi.h"
 #include "intel_ddi_buf_trans.h"
 #include "intel_de.h"
@@ -3488,6 +3489,21 @@ void intel_ddi_get_clock(struct intel_encoder *encoder,
 						     &crtc_state->dpll_hw_state);
 }
 
+static void mtl_ddi_get_config(struct intel_encoder *encoder,
+			       struct intel_crtc_state *crtc_state)
+{
+	struct drm_i915_private *i915 = to_i915(encoder->base.dev);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+
+	drm_WARN_ON(&i915->drm, !intel_is_c10phy(i915, phy));
+
+	intel_c10pll_readout_hw_state(encoder, &crtc_state->cx0pll_state.c10);
+	intel_c10pll_dump_hw_state(i915, &crtc_state->cx0pll_state.c10);
+	crtc_state->port_clock = intel_c10pll_calc_port_clock(encoder, &crtc_state->cx0pll_state.c10);
+
+	intel_ddi_get_config(encoder, crtc_state);
+}
+
 static void dg2_ddi_get_config(struct intel_encoder *encoder,
 				struct intel_crtc_state *crtc_state)
 {
@@ -4396,7 +4412,11 @@ void intel_ddi_init(struct drm_i915_private *dev_priv, enum port port)
 	encoder->cloneable = 0;
 	encoder->pipe_mask = ~0;
 
-	if (IS_DG2(dev_priv)) {
+	if (DISPLAY_VER(dev_priv) >= 14) {
+		encoder->enable_clock = intel_cx0pll_enable;
+		encoder->disable_clock = intel_cx0pll_disable;
+		encoder->get_config = mtl_ddi_get_config;
+	} else if (IS_DG2(dev_priv)) {
 		encoder->enable_clock = intel_mpllb_enable;
 		encoder->disable_clock = intel_mpllb_disable;
 		encoder->get_config = dg2_ddi_get_config;
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index b28c8dc..64b6a5e 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -989,6 +989,18 @@ struct intel_csc_matrix {
 	u16 postoff[3];
 };
 
+struct intel_c10pll_state {
+	u32 clock; /* in KHz */
+	u8 tx;
+	u8 cmn;
+	u8 pll[20];
+};
+
+struct intel_cx0pll_state {
+	struct intel_c10pll_state c10;
+	bool ssc_enabled;
+};
+
 struct intel_crtc_state {
 	/*
 	 * uapi (drm) state. This is the software state shown to userspace.
@@ -1134,6 +1146,7 @@ struct intel_crtc_state {
 	union {
 		struct intel_dpll_hw_state dpll_hw_state;
 		struct intel_mpllb_state mpllb_state;
+		struct intel_cx0pll_state cx0pll_state;
 	};
 
 	/*
diff --git a/drivers/gpu/drm/i915/display/intel_dpll.c b/drivers/gpu/drm/i915/display/intel_dpll.c
index 4e9c18b..a9fbef0 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll.c
@@ -8,6 +8,7 @@
 
 #include "i915_reg.h"
 #include "intel_crtc.h"
+#include "intel_cx0_phy.h"
 #include "intel_de.h"
 #include "intel_display.h"
 #include "intel_display_types.h"
@@ -995,6 +996,30 @@ static int dg2_crtc_compute_clock(struct intel_atomic_state *state,
 	return 0;
 }
 
+static int mtl_crtc_compute_clock(struct intel_atomic_state *state,
+				  struct intel_crtc *crtc)
+{
+	struct drm_i915_private *i915 = to_i915(state->base.dev);
+	struct intel_crtc_state *crtc_state =
+		intel_atomic_get_new_crtc_state(state, crtc);
+	struct intel_encoder *encoder =
+		intel_get_crtc_new_encoder(state, crtc_state);
+	enum phy phy = intel_port_to_phy(i915, encoder->port);
+	int ret;
+
+	ret = intel_cx0pll_calc_state(crtc_state, encoder);
+	if (ret)
+		return ret;
+
+	/* TODO: Do the readback via intel_compute_shared_dplls() */
+	if (intel_is_c10phy(i915, phy))
+		crtc_state->port_clock = intel_c10pll_calc_port_clock(encoder, &crtc_state->cx0pll_state.c10);
+
+	crtc_state->hw.adjusted_mode.crtc_clock = intel_crtc_dotclock(crtc_state);
+
+	return 0;
+}
+
 static bool ilk_needs_fb_cb_tune(const struct dpll *dpll, int factor)
 {
 	return dpll->m < factor * dpll->n;
@@ -1423,6 +1448,10 @@ static int i8xx_crtc_compute_clock(struct intel_atomic_state *state,
 	return 0;
 }
 
+static const struct intel_dpll_funcs mtl_dpll_funcs = {
+	.crtc_compute_clock = mtl_crtc_compute_clock,
+};
+
 static const struct intel_dpll_funcs dg2_dpll_funcs = {
 	.crtc_compute_clock = dg2_crtc_compute_clock,
 };
@@ -1517,7 +1546,9 @@ int intel_dpll_crtc_get_shared_dpll(struct intel_atomic_state *state,
 void
 intel_dpll_init_clock_hook(struct drm_i915_private *dev_priv)
 {
-	if (IS_DG2(dev_priv))
+	if (DISPLAY_VER(dev_priv) >= 14)
+		dev_priv->display.funcs.dpll = &mtl_dpll_funcs;
+	else if (IS_DG2(dev_priv))
 		dev_priv->display.funcs.dpll = &dg2_dpll_funcs;
 	else if (DISPLAY_VER(dev_priv) >= 9 || HAS_DDI(dev_priv))
 		dev_priv->display.funcs.dpll = &hsw_dpll_funcs;
diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
index 22fc908..ed372d2 100644
--- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
+++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
@@ -4104,7 +4104,7 @@ void intel_shared_dpll_init(struct drm_i915_private *dev_priv)
 
 	mutex_init(&dev_priv->display.dpll.lock);
 
-	if (IS_DG2(dev_priv))
+	if (DISPLAY_VER(dev_priv) >= 14 || IS_DG2(dev_priv))
 		/* No shared DPLLs on DG2; port PLLs are part of the PHY */
 		dpll_mgr = NULL;
 	else if (IS_ALDERLAKE_P(dev_priv))
diff --git a/drivers/gpu/drm/i915/display/intel_modeset_verify.c b/drivers/gpu/drm/i915/display/intel_modeset_verify.c
index 842d70f..5e0ec15 100644
--- a/drivers/gpu/drm/i915/display/intel_modeset_verify.c
+++ b/drivers/gpu/drm/i915/display/intel_modeset_verify.c
@@ -11,6 +11,7 @@
 #include "intel_atomic.h"
 #include "intel_crtc.h"
 #include "intel_crtc_state_dump.h"
+#include "intel_cx0_phy.h"
 #include "intel_display.h"
 #include "intel_display_types.h"
 #include "intel_fdi.h"
@@ -236,6 +237,7 @@ void intel_modeset_verify_crtc(struct intel_crtc *crtc,
 	verify_crtc_state(crtc, old_crtc_state, new_crtc_state);
 	intel_shared_dpll_state_verify(crtc, old_crtc_state, new_crtc_state);
 	intel_mpllb_state_verify(state, new_crtc_state);
+	intel_c10pll_state_verify(state, new_crtc_state);
 }
 
 void intel_modeset_verify_disabled(struct drm_i915_private *dev_priv,
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 4511f01..9245572 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1799,6 +1799,11 @@
 #define CLKGATE_DIS_PSL_EXT(pipe) \
 	_MMIO_PIPE(pipe, _CLKGATE_DIS_PSL_EXT_A, _CLKGATE_DIS_PSL_EXT_B)
 
+/* DDI Buffer Control */
+#define _DDI_CLK_VALFREQ_A		0x64030
+#define _DDI_CLK_VALFREQ_B		0x64130
+#define DDI_CLK_VALFREQ(port)		_MMIO_PORT(port, _DDI_CLK_VALFREQ_A, _DDI_CLK_VALFREQ_B)
+
 /*
  * Display engine regs
  */
diff --git a/drivers/gpu/drm/i915/i915_reg_defs.h b/drivers/gpu/drm/i915/i915_reg_defs.h
index db26de6..622d603 100644
--- a/drivers/gpu/drm/i915/i915_reg_defs.h
+++ b/drivers/gpu/drm/i915/i915_reg_defs.h
@@ -23,6 +23,19 @@
 				 ((__n) < 0 || (__n) > 31))))
 
 /**
+ * REG_BIT8() - Prepare a u8 bit value
+ * @__n: 0-based bit number
+ *
+ * Local wrapper for BIT() to force u8, with compile time checks.
+ *
+ * @return: Value with bit @__n set.
+ */
+#define REG_BIT8(__n)                                                   \
+	((u8)(BIT(__n) +                                                \
+	       BUILD_BUG_ON_ZERO(__is_constexpr(__n) &&         \
+				 ((__n) < 0 || (__n) > 7))))
+
+/**
  * REG_GENMASK() - Prepare a continuous u32 bitmask
  * @__high: 0-based high bit
  * @__low: 0-based low bit
@@ -52,6 +65,21 @@
 				 __is_constexpr(__low) &&		\
 				 ((__low) < 0 || (__high) > 63 || (__low) > (__high)))))
 
+/**
+ * REG_GENMASK8() - Prepare a continuous u8 bitmask
+ * @__high: 0-based high bit
+ * @__low: 0-based low bit
+ *
+ * Local wrapper for GENMASK() to force u8, with compile time checks.
+ *
+ * @return: Continuous bitmask from @__high to @__low, inclusive.
+ */
+#define REG_GENMASK8(__high, __low)                                     \
+	((u8)(GENMASK(__high, __low) +                                  \
+	       BUILD_BUG_ON_ZERO(__is_constexpr(__high) &&      \
+				 __is_constexpr(__low) &&               \
+				 ((__low) < 0 || (__high) > 7 || (__low) > (__high)))))
+
 /*
  * Local integer constant expression version of is_power_of_2().
  */
@@ -75,6 +103,23 @@
 	       BUILD_BUG_ON_ZERO(__builtin_choose_expr(__is_constexpr(__val), (~((__mask) >> __bf_shf(__mask)) & (__val)), 0))))
 
 /**
+ * REG_FIELD_PREP8() - Prepare a u8 bitfield value
+ * @__mask: shifted mask defining the field's length and position
+ * @__val: value to put in the field
+ *
+ * Local copy of FIELD_PREP() to generate an integer constant expression, force
+ * u8 and for consistency with REG_FIELD_GET8(), REG_BIT8() and REG_GENMASK8().
+ *
+ * @return: @__val masked and shifted into the field defined by @__mask.
+ */
+#define REG_FIELD_PREP8(__mask, __val)                                          \
+	((u8)((((typeof(__mask))(__val) << __bf_shf(__mask)) & (__mask)) +      \
+	       BUILD_BUG_ON_ZERO(!__is_constexpr(__mask)) +             \
+	       BUILD_BUG_ON_ZERO((__mask) == 0 || (__mask) > U8_MAX) +          \
+	       BUILD_BUG_ON_ZERO(!IS_POWER_OF_2((__mask) + (1ULL << __bf_shf(__mask)))) + \
+	       BUILD_BUG_ON_ZERO(__builtin_choose_expr(__is_constexpr(__val), (~((__mask) >> __bf_shf(__mask)) & (__val)), 0))))
+
+/**
  * REG_FIELD_GET() - Extract a u32 bitfield value
  * @__mask: shifted mask defining the field's length and position
  * @__val: value to extract the bitfield value from
@@ -155,6 +200,18 @@
  */
 #define _PICK(__index, ...) (((const u32 []){ __VA_ARGS__ })[__index])
 
+/**
+ * REG_FIELD_GET8() - Extract a u8 bitfield value
+ * @__mask: shifted mask defining the field's length and position
+ * @__val: value to extract the bitfield value from
+ *
+ * Local wrapper for FIELD_GET() to force u8 and for consistency with
+ * REG_FIELD_PREP(), REG_BIT() and REG_GENMASK().
+ *
+ * @return: Masked and shifted value of the field defined by @__mask in @__val.
+ */
+#define REG_FIELD_GET8(__mask, __val)   ((u8)FIELD_GET(__mask, __val))
+
 typedef struct {
 	u32 reg;
 } i915_reg_t;