diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c b/drivers/gpu/drm/i915/display/intel_cdclk.c
index be268c6abe21..ad0f03e51e4a 100644
--- a/drivers/gpu/drm/i915/display/intel_cdclk.c
+++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
@@ -1876,6 +1876,19 @@ static bool cdclk_pll_is_unknown(unsigned int vco)
 	return vco == ~0;
 }
 
+static bool mdclk_source_is_cdclk_pll(struct drm_i915_private *i915)
+{
+	return DISPLAY_VER(i915) >= 20;
+}
+
+static u32 xe2lpd_mdclk_source_sel(struct drm_i915_private *i915)
+{
+	if (mdclk_source_is_cdclk_pll(i915))
+		return MDCLK_SOURCE_SEL_CDCLK_PLL;
+
+	return MDCLK_SOURCE_SEL_CD2XCLK;
+}
+
 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,
@@ -1980,7 +1993,7 @@ static u32 bxt_cdclk_ctl(struct drm_i915_private *i915,
 		val |= BXT_CDCLK_SSA_PRECHARGE_ENABLE;
 
 	if (DISPLAY_VER(i915) >= 20)
-		val |= MDCLK_SOURCE_SEL_CDCLK_PLL;
+		val |= xe2lpd_mdclk_source_sel(i915);
 	else
 		val |= skl_cdclk_decimal(cdclk);
 
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8823531b8770..d6193c858a74 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -5891,7 +5891,9 @@ enum skl_power_gate {
 #define  CDCLK_FREQ_540		REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 1)
 #define  CDCLK_FREQ_337_308		REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 2)
 #define  CDCLK_FREQ_675_617		REG_FIELD_PREP(CDCLK_FREQ_SEL_MASK, 3)
-#define  MDCLK_SOURCE_SEL_CDCLK_PLL	REG_BIT(25)
+#define  MDCLK_SOURCE_SEL_MASK		REG_GENMASK(25, 25)
+#define  MDCLK_SOURCE_SEL_CD2XCLK	REG_FIELD_PREP(MDCLK_SOURCE_SEL_MASK, 0)
+#define  MDCLK_SOURCE_SEL_CDCLK_PLL	REG_FIELD_PREP(MDCLK_SOURCE_SEL_MASK, 1)
 #define  BXT_CDCLK_CD2X_DIV_SEL_MASK	REG_GENMASK(23, 22)
 #define  BXT_CDCLK_CD2X_DIV_SEL_1	REG_FIELD_PREP(BXT_CDCLK_CD2X_DIV_SEL_MASK, 0)
 #define  BXT_CDCLK_CD2X_DIV_SEL_1_5	REG_FIELD_PREP(BXT_CDCLK_CD2X_DIV_SEL_MASK, 1)