diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1a135a7..9e5ccf8 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10543,6 +10543,14 @@ enum skl_power_gate {
 #define  BXT_CDCLK_SSA_PRECHARGE_ENABLE	(1 << 16)
 #define  CDCLK_FREQ_DECIMAL_MASK	(0x7ff)
 
+/* CDCLK_SQUASH_CTL */
+#define CDCLK_SQUASH_CTL		_MMIO(0x46008)
+#define  CDCLK_SQUASH_ENABLE		REG_BIT(31)
+#define  CDCLK_SQUASH_WINDOW_SIZE_MASK	REG_GENMASK(27, 24)
+#define  CDCLK_SQUASH_WINDOW_SIZE(x)	REG_FIELD_PREP(CDCLK_SQUASH_WINDOW_SIZE_MASK, (x))
+#define  CDCLK_SQUASH_WAVEFORM_MASK	REG_GENMASK(15, 0)
+#define  CDCLK_SQUASH_WAVEFORM(x)	REG_FIELD_PREP(CDCLK_SQUASH_WAVEFORM_MASK, (x))
+
 /* LCPLL_CTL */
 #define LCPLL1_CTL		_MMIO(0x46010)
 #define LCPLL2_CTL		_MMIO(0x46014)