diff --git a/drivers/gpu/drm/i915/display/intel_display_clock_gating.c b/drivers/gpu/drm/i915/display/intel_display_clock_gating.c
index 59041c807d6d..a8966e6ace38 100644
--- a/drivers/gpu/drm/i915/display/intel_display_clock_gating.c
+++ b/drivers/gpu/drm/i915/display/intel_display_clock_gating.c
@@ -6,11 +6,39 @@
 #include <drm/intel/intel_gmd_misc_regs.h>
 
 #include "intel_de.h"
+#include "intel_display.h"
 #include "intel_display_clock_gating.h"
+#include "intel_display_core.h"
 #include "intel_display_regs.h"
 
+static void intel_display_gen9_init_clock_gating(struct intel_display *display)
+{
+	/* See Bspec note for PSR2_CTL bit 31, Wa#828:skl,bxt,kbl,cfl */
+	intel_de_rmw(display, CHICKEN_PAR1_1, 0, SKL_EDP_PSR_FIX_RDWRAP);
+
+	/* WaEnableChickenDCPR:skl,bxt,kbl,glk,cfl */
+	intel_de_rmw(display, GEN8_CHICKEN_DCPR_1, 0, MASK_WAKEMEM);
+
+	/*
+	 * WaFbcWakeMemOn:skl,bxt,kbl,glk,cfl
+	 * Display WA #0859: skl,bxt,kbl,glk,cfl
+	 */
+	intel_de_rmw(display, DISP_ARB_CTL, 0, DISP_FBC_MEMORY_WAKE);
+}
+
 void intel_display_skl_init_clock_gating(struct intel_display *display)
 {
+	/*
+	 * WaCompressedResourceDisplayNewHashMode:skl,kbl
+	 * Display WA #0390: skl,kbl
+	 *
+	 * Must match Sampler, Pixel Back End, and Media. See
+	 * WaCompressedResourceSamplerPbeMediaNewHashMode.
+	 */
+	intel_de_rmw(display, CHICKEN_PAR1_1, 0, SKL_DE_COMPRESSED_HASH_MODE);
+
+	intel_display_gen9_init_clock_gating(display);
+
 	/*
 	 * WaFbcTurnOffFbcWatermark:skl
 	 * Display WA #0562: skl
@@ -20,6 +48,17 @@ void intel_display_skl_init_clock_gating(struct intel_display *display)
 
 void intel_display_kbl_init_clock_gating(struct intel_display *display)
 {
+	/*
+	 * WaCompressedResourceDisplayNewHashMode:skl,kbl
+	 * Display WA #0390: skl,kbl
+	 *
+	 * Must match Sampler, Pixel Back End, and Media. See
+	 * WaCompressedResourceSamplerPbeMediaNewHashMode.
+	 */
+	intel_de_rmw(display, CHICKEN_PAR1_1, 0, SKL_DE_COMPRESSED_HASH_MODE);
+
+	intel_display_gen9_init_clock_gating(display);
+
 	/*
 	 * WaFbcTurnOffFbcWatermark:kbl
 	 * Display WA #0562: kbl
@@ -29,6 +68,23 @@ void intel_display_kbl_init_clock_gating(struct intel_display *display)
 
 void intel_display_cfl_init_clock_gating(struct intel_display *display)
 {
+	/*
+	 * WaCompressedResourceDisplayNewHashMode:skl,kbl (and cfl, cml)
+	 * Display WA #0390: skl,kbl (and cfl, cml)
+	 *
+	 * Must match Sampler, Pixel Back End, and Media. See
+	 * WaCompressedResourceSamplerPbeMediaNewHashMode.
+	 *
+	 * NOTE: this is the same workaround used for skl and kbl,
+	 * because the original implementation was checking HAS_LLC(),
+	 * which cfl/cml have, even though the comment for the
+	 * workaround doesn't mention it.
+	 *
+	 */
+	intel_de_rmw(display, CHICKEN_PAR1_1, 0, SKL_DE_COMPRESSED_HASH_MODE);
+
+	intel_display_gen9_init_clock_gating(display);
+
 	/*
 	 * WaFbcTurnOffFbcWatermark:cfl
 	 * Display WA #0562: cfl
@@ -38,6 +94,8 @@ void intel_display_cfl_init_clock_gating(struct intel_display *display)
 
 void intel_display_bxt_init_clock_gating(struct intel_display *display)
 {
+	intel_display_gen9_init_clock_gating(display);
+
 	/*
 	 * Wa: Backlight PWM may stop in the asserted state, causing backlight
 	 * to stay fully on.
@@ -60,3 +118,17 @@ void intel_display_bxt_init_clock_gating(struct intel_display *display)
 	 */
 	intel_de_rmw(display, DISP_ARB_CTL, 0, DISP_FBC_WM_DIS);
 }
+
+void intel_display_glk_init_clock_gating(struct intel_display *display)
+{
+	intel_display_gen9_init_clock_gating(display);
+
+	/*
+	 * WaDisablePWMClockGating:glk
+	 * Backlight PWM may stop in the asserted state, causing backlight
+	 * to stay fully on.
+	 */
+	intel_de_write(display, GEN9_CLKGATE_DIS_0,
+		       intel_de_read(display, GEN9_CLKGATE_DIS_0) |
+		       PWM1_GATING_DIS | PWM2_GATING_DIS);
+}
diff --git a/drivers/gpu/drm/i915/display/intel_display_clock_gating.h b/drivers/gpu/drm/i915/display/intel_display_clock_gating.h
index 6bc84a9a4342..a7784db9d97a 100644
--- a/drivers/gpu/drm/i915/display/intel_display_clock_gating.h
+++ b/drivers/gpu/drm/i915/display/intel_display_clock_gating.h
@@ -12,5 +12,6 @@ void intel_display_skl_init_clock_gating(struct intel_display *display);
 void intel_display_kbl_init_clock_gating(struct intel_display *display);
 void intel_display_cfl_init_clock_gating(struct intel_display *display);
 void intel_display_bxt_init_clock_gating(struct intel_display *display);
+void intel_display_glk_init_clock_gating(struct intel_display *display);
 
 #endif /* __INTEL_DISPLAY_CLOCK_GATING_H__ */
diff --git a/drivers/gpu/drm/i915/intel_clock_gating.c b/drivers/gpu/drm/i915/intel_clock_gating.c
index a9efa5ce8f6a..96fe16753e58 100644
--- a/drivers/gpu/drm/i915/intel_clock_gating.c
+++ b/drivers/gpu/drm/i915/intel_clock_gating.c
@@ -49,36 +49,8 @@ struct drm_i915_clock_gating_funcs {
 	void (*init_clock_gating)(struct drm_i915_private *i915);
 };
 
-static void gen9_init_clock_gating(struct drm_i915_private *i915)
-{
-	if (HAS_LLC(i915)) {
-		/*
-		 * WaCompressedResourceDisplayNewHashMode:skl,kbl
-		 * Display WA #0390: skl,kbl
-		 *
-		 * Must match Sampler, Pixel Back End, and Media. See
-		 * WaCompressedResourceSamplerPbeMediaNewHashMode.
-		 */
-		intel_uncore_rmw(&i915->uncore, CHICKEN_PAR1_1, 0, SKL_DE_COMPRESSED_HASH_MODE);
-	}
-
-	/* See Bspec note for PSR2_CTL bit 31, Wa#828:skl,bxt,kbl,cfl */
-	intel_uncore_rmw(&i915->uncore, CHICKEN_PAR1_1, 0, SKL_EDP_PSR_FIX_RDWRAP);
-
-	/* WaEnableChickenDCPR:skl,bxt,kbl,glk,cfl */
-	intel_uncore_rmw(&i915->uncore, GEN8_CHICKEN_DCPR_1, 0, MASK_WAKEMEM);
-
-	/*
-	 * WaFbcWakeMemOn:skl,bxt,kbl,glk,cfl
-	 * Display WA #0859: skl,bxt,kbl,glk,cfl
-	 */
-	intel_uncore_rmw(&i915->uncore, DISP_ARB_CTL, 0, DISP_FBC_MEMORY_WAKE);
-}
-
 static void bxt_init_clock_gating(struct drm_i915_private *i915)
 {
-	gen9_init_clock_gating(i915);
-
 	/* WaDisableSDEUnitClockGating:bxt */
 	intel_uncore_rmw(&i915->uncore, GEN8_UCGCTL6, 0, GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
 
@@ -93,16 +65,7 @@ static void bxt_init_clock_gating(struct drm_i915_private *i915)
 
 static void glk_init_clock_gating(struct drm_i915_private *i915)
 {
-	gen9_init_clock_gating(i915);
-
-	/*
-	 * WaDisablePWMClockGating:glk
-	 * Backlight PWM may stop in the asserted state, causing backlight
-	 * to stay fully on.
-	 */
-	intel_uncore_write(&i915->uncore, GEN9_CLKGATE_DIS_0,
-			   intel_uncore_read(&i915->uncore, GEN9_CLKGATE_DIS_0) |
-			   PWM1_GATING_DIS | PWM2_GATING_DIS);
+	intel_display_glk_init_clock_gating(i915->display);
 }
 
 static void g4x_disable_trickle_feed(struct drm_i915_private *dev_priv)
@@ -282,7 +245,6 @@ static void dg2_init_clock_gating(struct drm_i915_private *i915)
 static void cfl_init_clock_gating(struct drm_i915_private *i915)
 {
 	intel_pch_init_clock_gating(i915->display);
-	gen9_init_clock_gating(i915);
 
 	/* WAC6entrylatency:cfl */
 	intel_uncore_rmw(&i915->uncore, FBC_LLC_READ_CTRL, 0, FBC_LLC_FULLY_OPEN);
@@ -292,8 +254,6 @@ static void cfl_init_clock_gating(struct drm_i915_private *i915)
 
 static void kbl_init_clock_gating(struct drm_i915_private *i915)
 {
-	gen9_init_clock_gating(i915);
-
 	/* WAC6entrylatency:kbl */
 	intel_uncore_rmw(&i915->uncore, FBC_LLC_READ_CTRL, 0, FBC_LLC_FULLY_OPEN);
 
@@ -312,8 +272,6 @@ static void kbl_init_clock_gating(struct drm_i915_private *i915)
 
 static void skl_init_clock_gating(struct drm_i915_private *i915)
 {
-	gen9_init_clock_gating(i915);
-
 	/* WaDisableDopClockGating:skl */
 	intel_uncore_rmw(&i915->uncore, GEN7_MISCCPCTL,
 			 GEN7_DOP_CLOCK_GATE_ENABLE, 0);