diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index 4e143082dca1..31aaa9780dfc 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -40,6 +40,7 @@
 #include "intel_psr.h"
 #include "intel_vdsc.h"
 #include "skl_watermark.h"
+#include "skl_watermark_regs.h"
 #include "vlv_sideband.h"
 
 /**
@@ -1683,6 +1684,8 @@ static void bxt_get_cdclk(struct drm_i915_private *dev_priv,
 	}
 
  out:
+	if (DISPLAY_VER(dev_priv) >= 20)
+		cdclk_config->joined_mbus = intel_de_read(dev_priv, MBUS_CTL) & MBUS_JOIN;
 	/*
 	 * Can't read this out :( Let's assume it's
 	 * at least what the CDCLK frequency requires.
@@ -1900,6 +1903,14 @@ u8 intel_mdclk_cdclk_ratio(struct drm_i915_private *i915,
 	return 2;
 }
 
+static void xe2lpd_mdclk_cdclk_ratio_program(struct drm_i915_private *i915,
+					     const struct intel_cdclk_config *cdclk_config)
+{
+	intel_dbuf_mdclk_cdclk_ratio_update(i915,
+					    intel_mdclk_cdclk_ratio(i915, cdclk_config),
+					    cdclk_config->joined_mbus);
+}
+
 static bool cdclk_compute_crawl_and_squash_midpoint(struct drm_i915_private *i915,
 						    const struct intel_cdclk_config *old_cdclk_config,
 						    const struct intel_cdclk_config *new_cdclk_config,
@@ -2080,6 +2091,9 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 		return;
 	}
 
+	if (DISPLAY_VER(dev_priv) >= 20 && cdclk < dev_priv->display.cdclk.hw.cdclk)
+		xe2lpd_mdclk_cdclk_ratio_program(dev_priv, cdclk_config);
+
 	if (cdclk_compute_crawl_and_squash_midpoint(dev_priv, &dev_priv->display.cdclk.hw,
 						    cdclk_config, &mid_cdclk_config)) {
 		_bxt_set_cdclk(dev_priv, &mid_cdclk_config, pipe);
@@ -2088,6 +2102,9 @@ static void bxt_set_cdclk(struct drm_i915_private *dev_priv,
 		_bxt_set_cdclk(dev_priv, cdclk_config, pipe);
 	}
 
+	if (DISPLAY_VER(dev_priv) >= 20 && cdclk > dev_priv->display.cdclk.hw.cdclk)
+		xe2lpd_mdclk_cdclk_ratio_program(dev_priv, cdclk_config);
+
 	if (DISPLAY_VER(dev_priv) >= 14)
 		/*
 		 * NOOP - No Pcode communication needed for
@@ -3170,6 +3187,20 @@ int intel_cdclk_atomic_check(struct intel_atomic_state *state,
 	return 0;
 }
 
+int intel_cdclk_state_set_joined_mbus(struct intel_atomic_state *state, bool joined_mbus)
+{
+	struct intel_cdclk_state *cdclk_state;
+
+	cdclk_state = intel_atomic_get_cdclk_state(state);
+	if (IS_ERR(cdclk_state))
+		return PTR_ERR(cdclk_state);
+
+	cdclk_state->actual.joined_mbus = joined_mbus;
+	cdclk_state->logical.joined_mbus = joined_mbus;
+
+	return intel_atomic_lock_global_state(&cdclk_state->base);
+}
+
 int intel_cdclk_init(struct drm_i915_private *dev_priv)
 {
 	struct intel_cdclk_state *cdclk_state;
diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.h b/drivers/gpu/drm/i915/display/intel_cdclk.h
index 8e6e302bd599..e358234bfe26 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.h
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.h
@@ -18,6 +18,8 @@ struct intel_crtc_state;
 struct intel_cdclk_config {
 	unsigned int cdclk, vco, ref, bypass;
 	u8 voltage_level;
+	/* This field is only valid for Xe2LPD and above. */
+	bool joined_mbus;
 };
 
 struct intel_cdclk_state {
@@ -74,6 +76,7 @@ void intel_cdclk_get_cdclk(struct drm_i915_private *dev_priv,
 			   struct intel_cdclk_config *cdclk_config);
 int intel_cdclk_atomic_check(struct intel_atomic_state *state,
 			     bool *need_cdclk_calc);
+int intel_cdclk_state_set_joined_mbus(struct intel_atomic_state *state, bool joined_mbus);
 struct intel_cdclk_state *
 intel_atomic_get_cdclk_state(struct intel_atomic_state *state);
 
diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c
index 4410e21888ad..bc341abcab2f 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -12,6 +12,7 @@
 #include "intel_atomic.h"
 #include "intel_atomic_plane.h"
 #include "intel_bw.h"
+#include "intel_cdclk.h"
 #include "intel_crtc.h"
 #include "intel_de.h"
 #include "intel_display.h"
@@ -2601,10 +2602,17 @@ skl_compute_ddb(struct intel_atomic_state *state)
 			return ret;
 	}
 
-	if (HAS_MBUS_JOINING(i915))
+	if (HAS_MBUS_JOINING(i915)) {
 		new_dbuf_state->joined_mbus =
 			adlp_check_mbus_joined(new_dbuf_state->active_pipes);
 
+		if (old_dbuf_state->joined_mbus != new_dbuf_state->joined_mbus) {
+			ret = intel_cdclk_state_set_joined_mbus(state, new_dbuf_state->joined_mbus);
+			if (ret)
+				return ret;
+		}
+	}
+
 	for_each_intel_crtc(&i915->drm, crtc) {
 		enum pipe pipe = crtc->pipe;
 
@@ -3545,12 +3553,14 @@ int intel_dbuf_state_set_mdclk_cdclk_ratio(struct intel_atomic_state *state, u8
 	return intel_atomic_lock_global_state(&dbuf_state->base);
 }
 
-static void intel_dbuf_mdclk_cdclk_ratio_update(struct drm_i915_private *i915,
-						u8 ratio,
-						bool joined_mbus)
+void intel_dbuf_mdclk_cdclk_ratio_update(struct drm_i915_private *i915, u8 ratio, bool joined_mbus)
 {
 	enum dbuf_slice slice;
 
+	if (DISPLAY_VER(i915) >= 20)
+		intel_de_rmw(i915, MBUS_CTL, MBUS_TRANSLATION_THROTTLE_MIN_MASK,
+			     MBUS_TRANSLATION_THROTTLE_MIN(ratio - 1));
+
 	if (joined_mbus)
 		ratio *= 2;
 
@@ -3568,7 +3578,9 @@ static void update_mbus_pre_enable(struct intel_atomic_state *state)
 {
 	struct drm_i915_private *i915 = to_i915(state->base.dev);
 	u32 mbus_ctl;
-	const struct intel_dbuf_state *dbuf_state =
+	const struct intel_dbuf_state *old_dbuf_state =
+		intel_atomic_get_old_dbuf_state(state);
+	const struct intel_dbuf_state *new_dbuf_state =
 		intel_atomic_get_new_dbuf_state(state);
 
 	if (!HAS_MBUS_JOINING(i915))
@@ -3578,7 +3590,7 @@ static void update_mbus_pre_enable(struct intel_atomic_state *state)
 	 * TODO: Implement vblank synchronized MBUS joining changes.
 	 * Must be properly coordinated with dbuf reprogramming.
 	 */
-	if (dbuf_state->joined_mbus)
+	if (new_dbuf_state->joined_mbus)
 		mbus_ctl = MBUS_HASHING_MODE_1x4 | MBUS_JOIN |
 			MBUS_JOIN_PIPE_SELECT_NONE;
 	else
@@ -3589,8 +3601,20 @@ static void update_mbus_pre_enable(struct intel_atomic_state *state)
 		     MBUS_HASHING_MODE_MASK | MBUS_JOIN |
 		     MBUS_JOIN_PIPE_SELECT_MASK, mbus_ctl);
 
-	intel_dbuf_mdclk_cdclk_ratio_update(i915, dbuf_state->mdclk_cdclk_ratio,
-					    dbuf_state->joined_mbus);
+	if (DISPLAY_VER(i915) >= 20 &&
+	    old_dbuf_state->mdclk_cdclk_ratio != new_dbuf_state->mdclk_cdclk_ratio) {
+		/*
+		 * For Xe2LPD and beyond, when there is a change in the ratio
+		 * between MDCLK and CDCLK, updates to related registers need to
+		 * happen at a specific point in the CDCLK change sequence. In
+		 * that case, we defer to the call to
+		 * intel_dbuf_mdclk_cdclk_ratio_update() to the CDCLK logic.
+		 */
+		return;
+	}
+
+	intel_dbuf_mdclk_cdclk_ratio_update(i915, new_dbuf_state->mdclk_cdclk_ratio,
+					    new_dbuf_state->joined_mbus);
 }
 
 void intel_dbuf_pre_plane_update(struct intel_atomic_state *state)
diff --git a/drivers/gpu/drm/i915/display/skl_watermark.h b/drivers/gpu/drm/i915/display/skl_watermark.h
index fed4d12df584..3a90741cab06 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.h
+++ b/drivers/gpu/drm/i915/display/skl_watermark.h
@@ -76,6 +76,7 @@ int intel_dbuf_state_set_mdclk_cdclk_ratio(struct intel_atomic_state *state, u8
 
 void intel_dbuf_pre_plane_update(struct intel_atomic_state *state);
 void intel_dbuf_post_plane_update(struct intel_atomic_state *state);
+void intel_dbuf_mdclk_cdclk_ratio_update(struct drm_i915_private *i915, u8 ratio, bool joined_mbus);
 void intel_mbus_dbox_update(struct intel_atomic_state *state);
 
 #endif /* __SKL_WATERMARK_H__ */
diff --git a/drivers/gpu/drm/i915/display/skl_watermark_regs.h b/drivers/gpu/drm/i915/display/skl_watermark_regs.h
index 20b30c9a6613..269163fa3350 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark_regs.h
+++ b/drivers/gpu/drm/i915/display/skl_watermark_regs.h
@@ -32,14 +32,16 @@
 #define MBUS_BBOX_CTL_S1		_MMIO(0x45040)
 #define MBUS_BBOX_CTL_S2		_MMIO(0x45044)
 
-#define MBUS_CTL			_MMIO(0x4438C)
-#define MBUS_JOIN			REG_BIT(31)
-#define MBUS_HASHING_MODE_MASK		REG_BIT(30)
-#define MBUS_HASHING_MODE_2x2		REG_FIELD_PREP(MBUS_HASHING_MODE_MASK, 0)
-#define MBUS_HASHING_MODE_1x4		REG_FIELD_PREP(MBUS_HASHING_MODE_MASK, 1)
-#define MBUS_JOIN_PIPE_SELECT_MASK	REG_GENMASK(28, 26)
-#define MBUS_JOIN_PIPE_SELECT(pipe)	REG_FIELD_PREP(MBUS_JOIN_PIPE_SELECT_MASK, pipe)
-#define MBUS_JOIN_PIPE_SELECT_NONE	MBUS_JOIN_PIPE_SELECT(7)
+#define MBUS_CTL				_MMIO(0x4438C)
+#define   MBUS_JOIN				REG_BIT(31)
+#define   MBUS_HASHING_MODE_MASK		REG_BIT(30)
+#define   MBUS_HASHING_MODE_2x2			REG_FIELD_PREP(MBUS_HASHING_MODE_MASK, 0)
+#define   MBUS_HASHING_MODE_1x4			REG_FIELD_PREP(MBUS_HASHING_MODE_MASK, 1)
+#define   MBUS_JOIN_PIPE_SELECT_MASK		REG_GENMASK(28, 26)
+#define   MBUS_JOIN_PIPE_SELECT(pipe)		REG_FIELD_PREP(MBUS_JOIN_PIPE_SELECT_MASK, pipe)
+#define   MBUS_JOIN_PIPE_SELECT_NONE		MBUS_JOIN_PIPE_SELECT(7)
+#define   MBUS_TRANSLATION_THROTTLE_MIN_MASK	REG_GENMASK(15, 13)
+#define   MBUS_TRANSLATION_THROTTLE_MIN(val)	REG_FIELD_PREP(MBUS_TRANSLATION_THROTTLE_MIN_MASK, val)
 
 /* Watermark register definitions for SKL */
 #define _CUR_WM_A_0		0x70140