drm/i915: rename intel_pm.[ch] to intel_clock_gating.[ch]

Observe that intel_pm.[ch] is now purely about clock gating, so rename
them to intel_clock_gating.[ch]. Rename the functions to
intel_clock_gating_*() to follow coding conventions.

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230403122428.3526263-1-jani.nikula@intel.com

1 files changed, 885 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_clock_gating.c b/drivers/gpu/drm/i915/intel_clock_gating.c
new file mode 100644
index 000000000000..8cfc19b48760
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_clock_gating.c
@@ -0,0 +1,885 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Eugeni Dodonov <eugeni.dodonov@intel.com>
+ *
+ */
+
+#include "display/intel_de.h"
+#include "display/intel_display.h"
+#include "display/intel_display_trace.h"
+#include "display/skl_watermark.h"
+
+#include "gt/intel_engine_regs.h"
+#include "gt/intel_gt.h"
+#include "gt/intel_gt_mcr.h"
+#include "gt/intel_gt_regs.h"
+
+#include "i915_drv.h"
+#include "intel_clock_gating.h"
+#include "intel_mchbar_regs.h"
+#include "vlv_sideband.h"
+
+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 *dev_priv)
+{
+	if (HAS_LLC(dev_priv)) {
+		/*
+		 * WaCompressedResourceDisplayNewHashMode:skl,kbl
+		 * Display WA #0390: skl,kbl
+		 *
+		 * Must match Sampler, Pixel Back End, and Media. See
+		 * WaCompressedResourceSamplerPbeMediaNewHashMode.
+		 */
+		intel_uncore_rmw(&dev_priv->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(&dev_priv->uncore, CHICKEN_PAR1_1, 0, SKL_EDP_PSR_FIX_RDWRAP);
+
+	/* WaEnableChickenDCPR:skl,bxt,kbl,glk,cfl */
+	intel_uncore_rmw(&dev_priv->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(&dev_priv->uncore, DISP_ARB_CTL, 0, DISP_FBC_MEMORY_WAKE);
+}
+
+static void bxt_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	gen9_init_clock_gating(dev_priv);
+
+	/* WaDisableSDEUnitClockGating:bxt */
+	intel_uncore_rmw(&dev_priv->uncore, GEN8_UCGCTL6, 0, GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
+	/*
+	 * FIXME:
+	 * GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ applies on 3x6 GT SKUs only.
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, GEN8_UCGCTL6, 0, GEN8_HDCUNIT_CLOCK_GATE_DISABLE_HDCREQ);
+
+	/*
+	 * Wa: Backlight PWM may stop in the asserted state, causing backlight
+	 * to stay fully on.
+	 */
+	intel_uncore_write(&dev_priv->uncore, GEN9_CLKGATE_DIS_0, intel_uncore_read(&dev_priv->uncore, GEN9_CLKGATE_DIS_0) |
+		   PWM1_GATING_DIS | PWM2_GATING_DIS);
+
+	/*
+	 * Lower the display internal timeout.
+	 * This is needed to avoid any hard hangs when DSI port PLL
+	 * is off and a MMIO access is attempted by any privilege
+	 * application, using batch buffers or any other means.
+	 */
+	intel_uncore_write(&dev_priv->uncore, RM_TIMEOUT, MMIO_TIMEOUT_US(950));
+
+	/*
+	 * WaFbcTurnOffFbcWatermark:bxt
+	 * Display WA #0562: bxt
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, DISP_ARB_CTL, 0, DISP_FBC_WM_DIS);
+
+	/*
+	 * WaFbcHighMemBwCorruptionAvoidance:bxt
+	 * Display WA #0883: bxt
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A), 0, DPFC_DISABLE_DUMMY0);
+}
+
+static void glk_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	gen9_init_clock_gating(dev_priv);
+
+	/*
+	 * WaDisablePWMClockGating:glk
+	 * Backlight PWM may stop in the asserted state, causing backlight
+	 * to stay fully on.
+	 */
+	intel_uncore_write(&dev_priv->uncore, GEN9_CLKGATE_DIS_0, intel_uncore_read(&dev_priv->uncore, GEN9_CLKGATE_DIS_0) |
+		   PWM1_GATING_DIS | PWM2_GATING_DIS);
+}
+
+static void ibx_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * On Ibex Peak and Cougar Point, we need to disable clock
+	 * gating for the panel power sequencer or it will fail to
+	 * start up when no ports are active.
+	 */
+	intel_uncore_write(&dev_priv->uncore, SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE);
+}
+
+static void g4x_disable_trickle_feed(struct drm_i915_private *dev_priv)
+{
+	enum pipe pipe;
+
+	for_each_pipe(dev_priv, pipe) {
+		intel_uncore_rmw(&dev_priv->uncore, DSPCNTR(pipe), 0, DISP_TRICKLE_FEED_DISABLE);
+
+		intel_uncore_rmw(&dev_priv->uncore, DSPSURF(pipe), 0, 0);
+		intel_uncore_posting_read(&dev_priv->uncore, DSPSURF(pipe));
+	}
+}
+
+static void ilk_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	u32 dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
+
+	/*
+	 * Required for FBC
+	 * WaFbcDisableDpfcClockGating:ilk
+	 */
+	dspclk_gate |= ILK_DPFCRUNIT_CLOCK_GATE_DISABLE |
+		   ILK_DPFCUNIT_CLOCK_GATE_DISABLE |
+		   ILK_DPFDUNIT_CLOCK_GATE_ENABLE;
+
+	intel_uncore_write(&dev_priv->uncore, PCH_3DCGDIS0,
+		   MARIUNIT_CLOCK_GATE_DISABLE |
+		   SVSMUNIT_CLOCK_GATE_DISABLE);
+	intel_uncore_write(&dev_priv->uncore, PCH_3DCGDIS1,
+		   VFMUNIT_CLOCK_GATE_DISABLE);
+
+	/*
+	 * According to the spec the following bits should be set in
+	 * order to enable memory self-refresh
+	 * The bit 22/21 of 0x42004
+	 * The bit 5 of 0x42020
+	 * The bit 15 of 0x45000
+	 */
+	intel_uncore_write(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2,
+		   (intel_uncore_read(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2) |
+		    ILK_DPARB_GATE | ILK_VSDPFD_FULL));
+	dspclk_gate |= ILK_DPARBUNIT_CLOCK_GATE_ENABLE;
+	intel_uncore_write(&dev_priv->uncore, DISP_ARB_CTL,
+		   (intel_uncore_read(&dev_priv->uncore, DISP_ARB_CTL) |
+		    DISP_FBC_WM_DIS));
+
+	/*
+	 * Based on the document from hardware guys the following bits
+	 * should be set unconditionally in order to enable FBC.
+	 * The bit 22 of 0x42000
+	 * The bit 22 of 0x42004
+	 * The bit 7,8,9 of 0x42020.
+	 */
+	if (IS_IRONLAKE_M(dev_priv)) {
+		/* WaFbcAsynchFlipDisableFbcQueue:ilk */
+		intel_uncore_rmw(&dev_priv->uncore, ILK_DISPLAY_CHICKEN1, 0, ILK_FBCQ_DIS);
+		intel_uncore_rmw(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2, 0, ILK_DPARB_GATE);
+	}
+
+	intel_uncore_write(&dev_priv->uncore, ILK_DSPCLK_GATE_D, dspclk_gate);
+
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2, 0, ILK_ELPIN_409_SELECT);
+
+	g4x_disable_trickle_feed(dev_priv);
+
+	ibx_init_clock_gating(dev_priv);
+}
+
+static void cpt_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	enum pipe pipe;
+	u32 val;
+
+	/*
+	 * On Ibex Peak and Cougar Point, we need to disable clock
+	 * gating for the panel power sequencer or it will fail to
+	 * start up when no ports are active.
+	 */
+	intel_uncore_write(&dev_priv->uncore, SOUTH_DSPCLK_GATE_D, PCH_DPLSUNIT_CLOCK_GATE_DISABLE |
+		   PCH_DPLUNIT_CLOCK_GATE_DISABLE |
+		   PCH_CPUNIT_CLOCK_GATE_DISABLE);
+	intel_uncore_rmw(&dev_priv->uncore, SOUTH_CHICKEN2, 0, DPLS_EDP_PPS_FIX_DIS);
+	/* The below fixes the weird display corruption, a few pixels shifted
+	 * downward, on (only) LVDS of some HP laptops with IVY.
+	 */
+	for_each_pipe(dev_priv, pipe) {
+		val = intel_uncore_read(&dev_priv->uncore, TRANS_CHICKEN2(pipe));
+		val |= TRANS_CHICKEN2_TIMING_OVERRIDE;
+		val &= ~TRANS_CHICKEN2_FDI_POLARITY_REVERSED;
+		if (dev_priv->display.vbt.fdi_rx_polarity_inverted)
+			val |= TRANS_CHICKEN2_FDI_POLARITY_REVERSED;
+		val &= ~TRANS_CHICKEN2_DISABLE_DEEP_COLOR_COUNTER;
+		val &= ~TRANS_CHICKEN2_DISABLE_DEEP_COLOR_MODESWITCH;
+		intel_uncore_write(&dev_priv->uncore, TRANS_CHICKEN2(pipe), val);
+	}
+	/* WADP0ClockGatingDisable */
+	for_each_pipe(dev_priv, pipe) {
+		intel_uncore_write(&dev_priv->uncore, TRANS_CHICKEN1(pipe),
+			   TRANS_CHICKEN1_DP0UNIT_GC_DISABLE);
+	}
+}
+
+static void gen6_check_mch_setup(struct drm_i915_private *dev_priv)
+{
+	u32 tmp;
+
+	tmp = intel_uncore_read(&dev_priv->uncore, MCH_SSKPD);
+	if (REG_FIELD_GET(SSKPD_WM0_MASK_SNB, tmp) != 12)
+		drm_dbg_kms(&dev_priv->drm,
+			    "Wrong MCH_SSKPD value: 0x%08x This can cause underruns.\n",
+			    tmp);
+}
+
+static void gen6_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	u32 dspclk_gate = ILK_VRHUNIT_CLOCK_GATE_DISABLE;
+
+	intel_uncore_write(&dev_priv->uncore, ILK_DSPCLK_GATE_D, dspclk_gate);
+
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2, 0, ILK_ELPIN_409_SELECT);
+
+	intel_uncore_write(&dev_priv->uncore, GEN6_UCGCTL1,
+		   intel_uncore_read(&dev_priv->uncore, GEN6_UCGCTL1) |
+		   GEN6_BLBUNIT_CLOCK_GATE_DISABLE |
+		   GEN6_CSUNIT_CLOCK_GATE_DISABLE);
+
+	/* According to the BSpec vol1g, bit 12 (RCPBUNIT) clock
+	 * gating disable must be set.  Failure to set it results in
+	 * flickering pixels due to Z write ordering failures after
+	 * some amount of runtime in the Mesa "fire" demo, and Unigine
+	 * Sanctuary and Tropics, and apparently anything else with
+	 * alpha test or pixel discard.
+	 *
+	 * According to the spec, bit 11 (RCCUNIT) must also be set,
+	 * but we didn't debug actual testcases to find it out.
+	 *
+	 * WaDisableRCCUnitClockGating:snb
+	 * WaDisableRCPBUnitClockGating:snb
+	 */
+	intel_uncore_write(&dev_priv->uncore, GEN6_UCGCTL2,
+		   GEN6_RCPBUNIT_CLOCK_GATE_DISABLE |
+		   GEN6_RCCUNIT_CLOCK_GATE_DISABLE);
+
+	/*
+	 * According to the spec the following bits should be
+	 * set in order to enable memory self-refresh and fbc:
+	 * The bit21 and bit22 of 0x42000
+	 * The bit21 and bit22 of 0x42004
+	 * The bit5 and bit7 of 0x42020
+	 * The bit14 of 0x70180
+	 * The bit14 of 0x71180
+	 *
+	 * WaFbcAsynchFlipDisableFbcQueue:snb
+	 */
+	intel_uncore_write(&dev_priv->uncore, ILK_DISPLAY_CHICKEN1,
+		   intel_uncore_read(&dev_priv->uncore, ILK_DISPLAY_CHICKEN1) |
+		   ILK_FBCQ_DIS | ILK_PABSTRETCH_DIS);
+	intel_uncore_write(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2,
+		   intel_uncore_read(&dev_priv->uncore, ILK_DISPLAY_CHICKEN2) |
+		   ILK_DPARB_GATE | ILK_VSDPFD_FULL);
+	intel_uncore_write(&dev_priv->uncore, ILK_DSPCLK_GATE_D,
+		   intel_uncore_read(&dev_priv->uncore, ILK_DSPCLK_GATE_D) |
+		   ILK_DPARBUNIT_CLOCK_GATE_ENABLE  |
+		   ILK_DPFDUNIT_CLOCK_GATE_ENABLE);
+
+	g4x_disable_trickle_feed(dev_priv);
+
+	cpt_init_clock_gating(dev_priv);
+
+	gen6_check_mch_setup(dev_priv);
+}
+
+static void lpt_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * TODO: this bit should only be enabled when really needed, then
+	 * disabled when not needed anymore in order to save power.
+	 */
+	if (HAS_PCH_LPT_LP(dev_priv))
+		intel_uncore_rmw(&dev_priv->uncore, SOUTH_DSPCLK_GATE_D,
+				 0, PCH_LP_PARTITION_LEVEL_DISABLE);
+
+	/* WADPOClockGatingDisable:hsw */
+	intel_uncore_rmw(&dev_priv->uncore, TRANS_CHICKEN1(PIPE_A),
+			 0, TRANS_CHICKEN1_DP0UNIT_GC_DISABLE);
+}
+
+static void gen8_set_l3sqc_credits(struct drm_i915_private *dev_priv,
+				   int general_prio_credits,
+				   int high_prio_credits)
+{
+	u32 misccpctl;
+	u32 val;
+
+	/* WaTempDisableDOPClkGating:bdw */
+	misccpctl = intel_uncore_rmw(&dev_priv->uncore, GEN7_MISCCPCTL,
+				     GEN7_DOP_CLOCK_GATE_ENABLE, 0);
+
+	val = intel_gt_mcr_read_any(to_gt(dev_priv), GEN8_L3SQCREG1);
+	val &= ~L3_PRIO_CREDITS_MASK;
+	val |= L3_GENERAL_PRIO_CREDITS(general_prio_credits);
+	val |= L3_HIGH_PRIO_CREDITS(high_prio_credits);
+	intel_gt_mcr_multicast_write(to_gt(dev_priv), GEN8_L3SQCREG1, val);
+
+	/*
+	 * Wait at least 100 clocks before re-enabling clock gating.
+	 * See the definition of L3SQCREG1 in BSpec.
+	 */
+	intel_gt_mcr_read_any(to_gt(dev_priv), GEN8_L3SQCREG1);
+	udelay(1);
+	intel_uncore_write(&dev_priv->uncore, GEN7_MISCCPCTL, misccpctl);
+}
+
+static void icl_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* Wa_1409120013:icl,ehl */
+	intel_uncore_write(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A),
+			   DPFC_CHICKEN_COMP_DUMMY_PIXEL);
+
+	/*Wa_14010594013:icl, ehl */
+	intel_uncore_rmw(&dev_priv->uncore, GEN8_CHICKEN_DCPR_1,
+			 0, ICL_DELAY_PMRSP);
+}
+
+static void gen12lp_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* Wa_1409120013 */
+	if (DISPLAY_VER(dev_priv) == 12)
+		intel_uncore_write(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A),
+				   DPFC_CHICKEN_COMP_DUMMY_PIXEL);
+
+	/* Wa_14013723622:tgl,rkl,dg1,adl-s */
+	if (DISPLAY_VER(dev_priv) == 12)
+		intel_uncore_rmw(&dev_priv->uncore, CLKREQ_POLICY,
+				 CLKREQ_POLICY_MEM_UP_OVRD, 0);
+}
+
+static void adlp_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	gen12lp_init_clock_gating(dev_priv);
+
+	/* Wa_22011091694:adlp */
+	intel_de_rmw(dev_priv, GEN9_CLKGATE_DIS_5, 0, DPCE_GATING_DIS);
+
+	/* Bspec/49189 Initialize Sequence */
+	intel_de_rmw(dev_priv, GEN8_CHICKEN_DCPR_1, DDI_CLOCK_REG_ACCESS, 0);
+}
+
+static void xehpsdv_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* Wa_22010146351:xehpsdv */
+	if (IS_XEHPSDV_GRAPHICS_STEP(dev_priv, STEP_A0, STEP_B0))
+		intel_uncore_rmw(&dev_priv->uncore, XEHP_CLOCK_GATE_DIS, 0, SGR_DIS);
+}
+
+static void dg2_init_clock_gating(struct drm_i915_private *i915)
+{
+	/* Wa_22010954014:dg2 */
+	intel_uncore_rmw(&i915->uncore, XEHP_CLOCK_GATE_DIS, 0,
+			 SGSI_SIDECLK_DIS);
+
+	/*
+	 * Wa_14010733611:dg2_g10
+	 * Wa_22010146351:dg2_g10
+	 */
+	if (IS_DG2_GRAPHICS_STEP(i915, G10, STEP_A0, STEP_B0))
+		intel_uncore_rmw(&i915->uncore, XEHP_CLOCK_GATE_DIS, 0,
+				 SGR_DIS | SGGI_DIS);
+}
+
+static void pvc_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* Wa_14012385139:pvc */
+	if (IS_PVC_BD_STEP(dev_priv, STEP_A0, STEP_B0))
+		intel_uncore_rmw(&dev_priv->uncore, XEHP_CLOCK_GATE_DIS, 0, SGR_DIS);
+
+	/* Wa_22010954014:pvc */
+	if (IS_PVC_BD_STEP(dev_priv, STEP_A0, STEP_B0))
+		intel_uncore_rmw(&dev_priv->uncore, XEHP_CLOCK_GATE_DIS, 0, SGSI_SIDECLK_DIS);
+}
+
+static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	if (!HAS_PCH_CNP(dev_priv))
+		return;
+
+	/* Display WA #1181 WaSouthDisplayDisablePWMCGEGating: cnp */
+	intel_uncore_rmw(&dev_priv->uncore, SOUTH_DSPCLK_GATE_D, 0, CNP_PWM_CGE_GATING_DISABLE);
+}
+
+static void cfl_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	cnp_init_clock_gating(dev_priv);
+	gen9_init_clock_gating(dev_priv);
+
+	/* WAC6entrylatency:cfl */
+	intel_uncore_rmw(&dev_priv->uncore, FBC_LLC_READ_CTRL, 0, FBC_LLC_FULLY_OPEN);
+
+	/*
+	 * WaFbcTurnOffFbcWatermark:cfl
+	 * Display WA #0562: cfl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, DISP_ARB_CTL, 0, DISP_FBC_WM_DIS);
+
+	/*
+	 * WaFbcNukeOnHostModify:cfl
+	 * Display WA #0873: cfl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A),
+			 0, DPFC_NUKE_ON_ANY_MODIFICATION);
+}
+
+static void kbl_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	gen9_init_clock_gating(dev_priv);
+
+	/* WAC6entrylatency:kbl */
+	intel_uncore_rmw(&dev_priv->uncore, FBC_LLC_READ_CTRL, 0, FBC_LLC_FULLY_OPEN);
+
+	/* WaDisableSDEUnitClockGating:kbl */
+	if (IS_KBL_GRAPHICS_STEP(dev_priv, 0, STEP_C0))
+		intel_uncore_rmw(&dev_priv->uncore, GEN8_UCGCTL6,
+				 0, GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
+	/* WaDisableGamClockGating:kbl */
+	if (IS_KBL_GRAPHICS_STEP(dev_priv, 0, STEP_C0))
+		intel_uncore_rmw(&dev_priv->uncore, GEN6_UCGCTL1,
+				 0, GEN6_GAMUNIT_CLOCK_GATE_DISABLE);
+
+	/*
+	 * WaFbcTurnOffFbcWatermark:kbl
+	 * Display WA #0562: kbl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, DISP_ARB_CTL, 0, DISP_FBC_WM_DIS);
+
+	/*
+	 * WaFbcNukeOnHostModify:kbl
+	 * Display WA #0873: kbl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A),
+			 0, DPFC_NUKE_ON_ANY_MODIFICATION);
+}
+
+static void skl_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	gen9_init_clock_gating(dev_priv);
+
+	/* WaDisableDopClockGating:skl */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_MISCCPCTL,
+			 GEN7_DOP_CLOCK_GATE_ENABLE, 0);
+
+	/* WAC6entrylatency:skl */
+	intel_uncore_rmw(&dev_priv->uncore, FBC_LLC_READ_CTRL, 0, FBC_LLC_FULLY_OPEN);
+
+	/*
+	 * WaFbcTurnOffFbcWatermark:skl
+	 * Display WA #0562: skl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, DISP_ARB_CTL, 0, DISP_FBC_WM_DIS);
+
+	/*
+	 * WaFbcNukeOnHostModify:skl
+	 * Display WA #0873: skl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A),
+			 0, DPFC_NUKE_ON_ANY_MODIFICATION);
+
+	/*
+	 * WaFbcHighMemBwCorruptionAvoidance:skl
+	 * Display WA #0883: skl
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DPFC_CHICKEN(INTEL_FBC_A), 0, DPFC_DISABLE_DUMMY0);
+}
+
+static void bdw_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	enum pipe pipe;
+
+	/* WaFbcAsynchFlipDisableFbcQueue:hsw,bdw */
+	intel_uncore_rmw(&dev_priv->uncore, CHICKEN_PIPESL_1(PIPE_A), 0, HSW_FBCQ_DIS);
+
+	/* WaSwitchSolVfFArbitrationPriority:bdw */
+	intel_uncore_rmw(&dev_priv->uncore, GAM_ECOCHK, 0, HSW_ECOCHK_ARB_PRIO_SOL);
+
+	/* WaPsrDPAMaskVBlankInSRD:bdw */
+	intel_uncore_rmw(&dev_priv->uncore, CHICKEN_PAR1_1, 0, DPA_MASK_VBLANK_SRD);
+
+	for_each_pipe(dev_priv, pipe) {
+		/* WaPsrDPRSUnmaskVBlankInSRD:bdw */
+		intel_uncore_rmw(&dev_priv->uncore, CHICKEN_PIPESL_1(pipe),
+				 0, BDW_DPRS_MASK_VBLANK_SRD);
+	}
+
+	/* WaVSRefCountFullforceMissDisable:bdw */
+	/* WaDSRefCountFullforceMissDisable:bdw */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_FF_THREAD_MODE,
+			 GEN8_FF_DS_REF_CNT_FFME | GEN7_FF_VS_REF_CNT_FFME, 0);
+
+	intel_uncore_write(&dev_priv->uncore, RING_PSMI_CTL(RENDER_RING_BASE),
+		   _MASKED_BIT_ENABLE(GEN8_RC_SEMA_IDLE_MSG_DISABLE));
+
+	/* WaDisableSDEUnitClockGating:bdw */
+	intel_uncore_rmw(&dev_priv->uncore, GEN8_UCGCTL6, 0, GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
+	/* WaProgramL3SqcReg1Default:bdw */
+	gen8_set_l3sqc_credits(dev_priv, 30, 2);
+
+	/* WaKVMNotificationOnConfigChange:bdw */
+	intel_uncore_rmw(&dev_priv->uncore, CHICKEN_PAR2_1,
+			 0, KVM_CONFIG_CHANGE_NOTIFICATION_SELECT);
+
+	lpt_init_clock_gating(dev_priv);
+
+	/* WaDisableDopClockGating:bdw
+	 *
+	 * Also see the CHICKEN2 write in bdw_init_workarounds() to disable DOP
+	 * clock gating.
+	 */
+	intel_uncore_rmw(&dev_priv->uncore, GEN6_UCGCTL1, 0, GEN6_EU_TCUNIT_CLOCK_GATE_DISABLE);
+}
+
+static void hsw_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* WaFbcAsynchFlipDisableFbcQueue:hsw,bdw */
+	intel_uncore_rmw(&dev_priv->uncore, CHICKEN_PIPESL_1(PIPE_A), 0, HSW_FBCQ_DIS);
+
+	/* This is required by WaCatErrorRejectionIssue:hsw */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
+			 0, GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
+
+	/* WaSwitchSolVfFArbitrationPriority:hsw */
+	intel_uncore_rmw(&dev_priv->uncore, GAM_ECOCHK, 0, HSW_ECOCHK_ARB_PRIO_SOL);
+
+	lpt_init_clock_gating(dev_priv);
+}
+
+static void ivb_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	intel_uncore_write(&dev_priv->uncore, ILK_DSPCLK_GATE_D, ILK_VRHUNIT_CLOCK_GATE_DISABLE);
+
+	/* WaFbcAsynchFlipDisableFbcQueue:ivb */
+	intel_uncore_rmw(&dev_priv->uncore, ILK_DISPLAY_CHICKEN1, 0, ILK_FBCQ_DIS);
+
+	/* WaDisableBackToBackFlipFix:ivb */
+	intel_uncore_write(&dev_priv->uncore, IVB_CHICKEN3,
+		   CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
+		   CHICKEN3_DGMG_DONE_FIX_DISABLE);
+
+	if (IS_IVB_GT1(dev_priv))
+		intel_uncore_write(&dev_priv->uncore, GEN7_ROW_CHICKEN2,
+			   _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
+	else {
+		/* must write both registers */
+		intel_uncore_write(&dev_priv->uncore, GEN7_ROW_CHICKEN2,
+			   _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
+		intel_uncore_write(&dev_priv->uncore, GEN7_ROW_CHICKEN2_GT2,
+			   _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
+	}
+
+	/*
+	 * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
+	 * This implements the WaDisableRCZUnitClockGating:ivb workaround.
+	 */
+	intel_uncore_write(&dev_priv->uncore, GEN6_UCGCTL2,
+		   GEN6_RCZUNIT_CLOCK_GATE_DISABLE);
+
+	/* This is required by WaCatErrorRejectionIssue:ivb */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
+			 0, GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
+
+	g4x_disable_trickle_feed(dev_priv);
+
+	intel_uncore_rmw(&dev_priv->uncore, GEN6_MBCUNIT_SNPCR, GEN6_MBC_SNPCR_MASK,
+			 GEN6_MBC_SNPCR_MED);
+
+	if (!HAS_PCH_NOP(dev_priv))
+		cpt_init_clock_gating(dev_priv);
+
+	gen6_check_mch_setup(dev_priv);
+}
+
+static void vlv_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* WaDisableBackToBackFlipFix:vlv */
+	intel_uncore_write(&dev_priv->uncore, IVB_CHICKEN3,
+		   CHICKEN3_DGMG_REQ_OUT_FIX_DISABLE |
+		   CHICKEN3_DGMG_DONE_FIX_DISABLE);
+
+	/* WaDisableDopClockGating:vlv */
+	intel_uncore_write(&dev_priv->uncore, GEN7_ROW_CHICKEN2,
+		   _MASKED_BIT_ENABLE(DOP_CLOCK_GATING_DISABLE));
+
+	/* This is required by WaCatErrorRejectionIssue:vlv */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_SQ_CHICKEN_MBCUNIT_CONFIG,
+			 0, GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB);
+
+	/*
+	 * According to the spec, bit 13 (RCZUNIT) must be set on IVB.
+	 * This implements the WaDisableRCZUnitClockGating:vlv workaround.
+	 */
+	intel_uncore_write(&dev_priv->uncore, GEN6_UCGCTL2,
+		   GEN6_RCZUNIT_CLOCK_GATE_DISABLE);
+
+	/* WaDisableL3Bank2xClockGate:vlv
+	 * Disabling L3 clock gating- MMIO 940c[25] = 1
+	 * Set bit 25, to disable L3_BANK_2x_CLK_GATING */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_UCGCTL4, 0, GEN7_L3BANK2X_CLOCK_GATE_DISABLE);
+
+	/*
+	 * WaDisableVLVClockGating_VBIIssue:vlv
+	 * Disable clock gating on th GCFG unit to prevent a delay
+	 * in the reporting of vblank events.
+	 */
+	intel_uncore_write(&dev_priv->uncore, VLV_GUNIT_CLOCK_GATE, GCFG_DIS);
+}
+
+static void chv_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	/* WaVSRefCountFullforceMissDisable:chv */
+	/* WaDSRefCountFullforceMissDisable:chv */
+	intel_uncore_rmw(&dev_priv->uncore, GEN7_FF_THREAD_MODE,
+			 GEN8_FF_DS_REF_CNT_FFME | GEN7_FF_VS_REF_CNT_FFME, 0);
+
+	/* WaDisableSemaphoreAndSyncFlipWait:chv */
+	intel_uncore_write(&dev_priv->uncore, RING_PSMI_CTL(RENDER_RING_BASE),
+		   _MASKED_BIT_ENABLE(GEN8_RC_SEMA_IDLE_MSG_DISABLE));
+
+	/* WaDisableCSUnitClockGating:chv */
+	intel_uncore_rmw(&dev_priv->uncore, GEN6_UCGCTL1, 0, GEN6_CSUNIT_CLOCK_GATE_DISABLE);
+
+	/* WaDisableSDEUnitClockGating:chv */
+	intel_uncore_rmw(&dev_priv->uncore, GEN8_UCGCTL6, 0, GEN8_SDEUNIT_CLOCK_GATE_DISABLE);
+
+	/*
+	 * WaProgramL3SqcReg1Default:chv
+	 * See gfxspecs/Related Documents/Performance Guide/
+	 * LSQC Setting Recommendations.
+	 */
+	gen8_set_l3sqc_credits(dev_priv, 38, 2);
+}
+
+static void g4x_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	u32 dspclk_gate;
+
+	intel_uncore_write(&dev_priv->uncore, RENCLK_GATE_D1, 0);
+	intel_uncore_write(&dev_priv->uncore, RENCLK_GATE_D2, VF_UNIT_CLOCK_GATE_DISABLE |
+		   GS_UNIT_CLOCK_GATE_DISABLE |
+		   CL_UNIT_CLOCK_GATE_DISABLE);
+	intel_uncore_write(&dev_priv->uncore, RAMCLK_GATE_D, 0);
+	dspclk_gate = VRHUNIT_CLOCK_GATE_DISABLE |
+		OVRUNIT_CLOCK_GATE_DISABLE |
+		OVCUNIT_CLOCK_GATE_DISABLE;
+	if (IS_GM45(dev_priv))
+		dspclk_gate |= DSSUNIT_CLOCK_GATE_DISABLE;
+	intel_uncore_write(&dev_priv->uncore, DSPCLK_GATE_D(dev_priv), dspclk_gate);
+
+	g4x_disable_trickle_feed(dev_priv);
+}
+
+static void i965gm_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+
+	intel_uncore_write(uncore, RENCLK_GATE_D1, I965_RCC_CLOCK_GATE_DISABLE);
+	intel_uncore_write(uncore, RENCLK_GATE_D2, 0);
+	intel_uncore_write(uncore, DSPCLK_GATE_D(dev_priv), 0);
+	intel_uncore_write(uncore, RAMCLK_GATE_D, 0);
+	intel_uncore_write16(uncore, DEUC, 0);
+	intel_uncore_write(uncore,
+			   MI_ARB_STATE,
+			   _MASKED_BIT_ENABLE(MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE));
+}
+
+static void i965g_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	intel_uncore_write(&dev_priv->uncore, RENCLK_GATE_D1, I965_RCZ_CLOCK_GATE_DISABLE |
+		   I965_RCC_CLOCK_GATE_DISABLE |
+		   I965_RCPB_CLOCK_GATE_DISABLE |
+		   I965_ISC_CLOCK_GATE_DISABLE |
+		   I965_FBC_CLOCK_GATE_DISABLE);
+	intel_uncore_write(&dev_priv->uncore, RENCLK_GATE_D2, 0);
+	intel_uncore_write(&dev_priv->uncore, MI_ARB_STATE,
+		   _MASKED_BIT_ENABLE(MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE));
+}
+
+static void gen3_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	u32 dstate = intel_uncore_read(&dev_priv->uncore, D_STATE);
+
+	dstate |= DSTATE_PLL_D3_OFF | DSTATE_GFX_CLOCK_GATING |
+		DSTATE_DOT_CLOCK_GATING;
+	intel_uncore_write(&dev_priv->uncore, D_STATE, dstate);
+
+	if (IS_PINEVIEW(dev_priv))
+		intel_uncore_write(&dev_priv->uncore, ECOSKPD(RENDER_RING_BASE),
+				   _MASKED_BIT_ENABLE(ECO_GATING_CX_ONLY));
+
+	/* IIR "flip pending" means done if this bit is set */
+	intel_uncore_write(&dev_priv->uncore, ECOSKPD(RENDER_RING_BASE),
+			   _MASKED_BIT_DISABLE(ECO_FLIP_DONE));
+
+	/* interrupts should cause a wake up from C3 */
+	intel_uncore_write(&dev_priv->uncore, INSTPM, _MASKED_BIT_ENABLE(INSTPM_AGPBUSY_INT_EN));
+
+	/* On GEN3 we really need to make sure the ARB C3 LP bit is set */
+	intel_uncore_write(&dev_priv->uncore, MI_ARB_STATE, _MASKED_BIT_ENABLE(MI_ARB_C3_LP_WRITE_ENABLE));
+
+	intel_uncore_write(&dev_priv->uncore, MI_ARB_STATE,
+		   _MASKED_BIT_ENABLE(MI_ARB_DISPLAY_TRICKLE_FEED_DISABLE));
+}
+
+static void i85x_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	intel_uncore_write(&dev_priv->uncore, RENCLK_GATE_D1, SV_CLOCK_GATE_DISABLE);
+
+	/* interrupts should cause a wake up from C3 */
+	intel_uncore_write(&dev_priv->uncore, MI_STATE, _MASKED_BIT_ENABLE(MI_AGPBUSY_INT_EN) |
+		   _MASKED_BIT_DISABLE(MI_AGPBUSY_830_MODE));
+
+	intel_uncore_write(&dev_priv->uncore, MEM_MODE,
+		   _MASKED_BIT_ENABLE(MEM_DISPLAY_TRICKLE_FEED_DISABLE));
+
+	/*
+	 * Have FBC ignore 3D activity since we use software
+	 * render tracking, and otherwise a pure 3D workload
+	 * (even if it just renders a single frame and then does
+	 * abosultely nothing) would not allow FBC to recompress
+	 * until a 2D blit occurs.
+	 */
+	intel_uncore_write(&dev_priv->uncore, SCPD0,
+		   _MASKED_BIT_ENABLE(SCPD_FBC_IGNORE_3D));
+}
+
+static void i830_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	intel_uncore_write(&dev_priv->uncore, MEM_MODE,
+		   _MASKED_BIT_ENABLE(MEM_DISPLAY_A_TRICKLE_FEED_DISABLE) |
+		   _MASKED_BIT_ENABLE(MEM_DISPLAY_B_TRICKLE_FEED_DISABLE));
+}
+
+void intel_clock_gating_init(struct drm_i915_private *dev_priv)
+{
+	dev_priv->clock_gating_funcs->init_clock_gating(dev_priv);
+}
+
+static void nop_init_clock_gating(struct drm_i915_private *dev_priv)
+{
+	drm_dbg_kms(&dev_priv->drm,
+		    "No clock gating settings or workarounds applied.\n");
+}
+
+#define CG_FUNCS(platform)						\
+static const struct drm_i915_clock_gating_funcs platform##_clock_gating_funcs = { \
+	.init_clock_gating = platform##_init_clock_gating,		\
+}
+
+CG_FUNCS(pvc);
+CG_FUNCS(dg2);
+CG_FUNCS(xehpsdv);
+CG_FUNCS(adlp);
+CG_FUNCS(gen12lp);
+CG_FUNCS(icl);
+CG_FUNCS(cfl);
+CG_FUNCS(skl);
+CG_FUNCS(kbl);
+CG_FUNCS(bxt);
+CG_FUNCS(glk);
+CG_FUNCS(bdw);
+CG_FUNCS(chv);
+CG_FUNCS(hsw);
+CG_FUNCS(ivb);
+CG_FUNCS(vlv);
+CG_FUNCS(gen6);
+CG_FUNCS(ilk);
+CG_FUNCS(g4x);
+CG_FUNCS(i965gm);
+CG_FUNCS(i965g);
+CG_FUNCS(gen3);
+CG_FUNCS(i85x);
+CG_FUNCS(i830);
+CG_FUNCS(nop);
+#undef CG_FUNCS
+
+/**
+ * intel_clock_gating_hooks_init - setup the clock gating hooks
+ * @dev_priv: device private
+ *
+ * Setup the hooks that configure which clocks of a given platform can be
+ * gated and also apply various GT and display specific workarounds for these
+ * platforms. Note that some GT specific workarounds are applied separately
+ * when GPU contexts or batchbuffers start their execution.
+ */
+void intel_clock_gating_hooks_init(struct drm_i915_private *dev_priv)
+{
+	if (IS_METEORLAKE(dev_priv))
+		dev_priv->clock_gating_funcs = &nop_clock_gating_funcs;
+	else if (IS_PONTEVECCHIO(dev_priv))
+		dev_priv->clock_gating_funcs = &pvc_clock_gating_funcs;
+	else if (IS_DG2(dev_priv))
+		dev_priv->clock_gating_funcs = &dg2_clock_gating_funcs;
+	else if (IS_XEHPSDV(dev_priv))
+		dev_priv->clock_gating_funcs = &xehpsdv_clock_gating_funcs;
+	else if (IS_ALDERLAKE_P(dev_priv))
+		dev_priv->clock_gating_funcs = &adlp_clock_gating_funcs;
+	else if (GRAPHICS_VER(dev_priv) == 12)
+		dev_priv->clock_gating_funcs = &gen12lp_clock_gating_funcs;
+	else if (GRAPHICS_VER(dev_priv) == 11)
+		dev_priv->clock_gating_funcs = &icl_clock_gating_funcs;
+	else if (IS_COFFEELAKE(dev_priv) || IS_COMETLAKE(dev_priv))
+		dev_priv->clock_gating_funcs = &cfl_clock_gating_funcs;
+	else if (IS_SKYLAKE(dev_priv))
+		dev_priv->clock_gating_funcs = &skl_clock_gating_funcs;
+	else if (IS_KABYLAKE(dev_priv))
+		dev_priv->clock_gating_funcs = &kbl_clock_gating_funcs;
+	else if (IS_BROXTON(dev_priv))
+		dev_priv->clock_gating_funcs = &bxt_clock_gating_funcs;
+	else if (IS_GEMINILAKE(dev_priv))
+		dev_priv->clock_gating_funcs = &glk_clock_gating_funcs;
+	else if (IS_BROADWELL(dev_priv))
+		dev_priv->clock_gating_funcs = &bdw_clock_gating_funcs;
+	else if (IS_CHERRYVIEW(dev_priv))
+		dev_priv->clock_gating_funcs = &chv_clock_gating_funcs;
+	else if (IS_HASWELL(dev_priv))
+		dev_priv->clock_gating_funcs = &hsw_clock_gating_funcs;
+	else if (IS_IVYBRIDGE(dev_priv))
+		dev_priv->clock_gating_funcs = &ivb_clock_gating_funcs;
+	else if (IS_VALLEYVIEW(dev_priv))
+		dev_priv->clock_gating_funcs = &vlv_clock_gating_funcs;
+	else if (GRAPHICS_VER(dev_priv) == 6)
+		dev_priv->clock_gating_funcs = &gen6_clock_gating_funcs;
+	else if (GRAPHICS_VER(dev_priv) == 5)
+		dev_priv->clock_gating_funcs = &ilk_clock_gating_funcs;
+	else if (IS_G4X(dev_priv))
+		dev_priv->clock_gating_funcs = &g4x_clock_gating_funcs;
+	else if (IS_I965GM(dev_priv))
+		dev_priv->clock_gating_funcs = &i965gm_clock_gating_funcs;
+	else if (IS_I965G(dev_priv))
+		dev_priv->clock_gating_funcs = &i965g_clock_gating_funcs;
+	else if (GRAPHICS_VER(dev_priv) == 3)
+		dev_priv->clock_gating_funcs = &gen3_clock_gating_funcs;
+	else if (IS_I85X(dev_priv) || IS_I865G(dev_priv))
+		dev_priv->clock_gating_funcs = &i85x_clock_gating_funcs;
+	else if (GRAPHICS_VER(dev_priv) == 2)
+		dev_priv->clock_gating_funcs = &i830_clock_gating_funcs;
+	else {
+		MISSING_CASE(INTEL_DEVID(dev_priv));
+		dev_priv->clock_gating_funcs = &nop_clock_gating_funcs;
+	}
+}