[PATCH 2/3][SRU][OEM-5.10] drm/i915/gen9bc: Handle TGP PCH during suspend/resume

[Koba Ko]

From: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>

BugLink: https://bugs.launchpad.net/bugs/1922768                                 

For Legacy S3 suspend/resume GEN9 BC needs to enable and
setup TGP PCH.

v2:
* Move Wa_14010685332 into it's own function - vsyrjala
* Add TODO comment about figuring out if we can move this workaround - imre
v3:
* Rename cnp_irq_post_reset() to cnp_display_clock_wa()
* Add TODO item mentioning we need to clarify which platforms this
  workaround applies to
* Just use ibx_irq_reset() in gen8_irq_reset(). This code should be
  functionally equivalent on gen9 bc to the code v2 added
* Drop icp_hpd_irq_setup() call in spt_hpd_irq_setup(), this looks to be
  more or less identical to spt_hpd_irq_setup() minus additionally enabling
  one port. Will update i915 to use icp_hpd_irq_setup() for ICP in a
  separate patch.
v4:
* Revert Wa_14010685332 system list in comments to how it was before
* Add back HAS_PCH_SPLIT() check before calling ibx_irq_reset()

Cc: Matt Roper <matthew.d.roper at intel.com>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
Signed-off-by: Lyude Paul <lyude at redhat.com>
Reviewed-by: Imre Deak <imre.deak at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210217180016.1937401-1-lyude@redhat.com
(cherry picked from commit 59b7cb44cffde6ab5b8ace1aef9b79f50be1c3eb git://anongit.freedesktop.org/drm-tip)
Signed-off-by: Koba Ko <koba.ko at canonical.com>
---
 drivers/gpu/drm/i915/i915_irq.c | 69 ++++++++++++++++-----------------
 1 file changed, 33 insertions(+), 36 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 1a7b8342a5a9d..91637cfa3be1c 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2838,6 +2838,24 @@ static void valleyview_irq_reset(struct drm_i915_private *dev_priv)
 	spin_unlock_irq(&dev_priv->irq_lock);
 }
 
+static void cnp_display_clock_wa(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+
+	/*
+	 * Wa_14010685332:cnp/cmp,tgp,adp
+	 * TODO: Clarify which platforms this applies to
+	 * TODO: Figure out if this workaround can be applied in the s0ix suspend/resume handlers as
+	 * on earlier platforms and whether the workaround is also needed for runtime suspend/resume
+	 */
+	if (INTEL_PCH_TYPE(dev_priv) == PCH_CNP ||
+	    (INTEL_PCH_TYPE(dev_priv) >= PCH_TGP && INTEL_PCH_TYPE(dev_priv) < PCH_DG1)) {
+		intel_uncore_rmw(uncore, SOUTH_CHICKEN1, SBCLK_RUN_REFCLK_DIS,
+				 SBCLK_RUN_REFCLK_DIS);
+		intel_uncore_rmw(uncore, SOUTH_CHICKEN1, SBCLK_RUN_REFCLK_DIS, 0);
+	}
+}
+
 static void gen8_irq_reset(struct drm_i915_private *dev_priv)
 {
 	struct intel_uncore *uncore = &dev_priv->uncore;
@@ -2861,6 +2879,8 @@ static void gen8_irq_reset(struct drm_i915_private *dev_priv)
 
 	if (HAS_PCH_SPLIT(dev_priv))
 		ibx_irq_reset(dev_priv);
+
+	cnp_display_clock_wa(dev_priv);
 }
 
 static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
@@ -2902,13 +2922,7 @@ static void gen11_display_irq_reset(struct drm_i915_private *dev_priv)
 	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
 		GEN3_IRQ_RESET(uncore, SDE);
 
-	/* Wa_14010685332:icl,jsl,ehl,tgl,rkl */
-	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP) {
-		intel_uncore_rmw(uncore, SOUTH_CHICKEN1,
-				 SBCLK_RUN_REFCLK_DIS, SBCLK_RUN_REFCLK_DIS);
-		intel_uncore_rmw(uncore, SOUTH_CHICKEN1,
-				 SBCLK_RUN_REFCLK_DIS, 0);
-	}
+	cnp_display_clock_wa(dev_priv);
 }
 
 static void gen11_irq_reset(struct drm_i915_private *dev_priv)
@@ -3474,10 +3488,20 @@ static void gen8_de_irq_postinstall(struct drm_i915_private *dev_priv)
 	}
 }
 
+static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
+{
+	struct intel_uncore *uncore = &dev_priv->uncore;
+	u32 mask = SDE_GMBUS_ICP;
+
+	GEN3_IRQ_INIT(uncore, SDE, ~mask, 0xffffffff);
+}
+
 static void gen8_irq_postinstall(struct drm_i915_private *dev_priv)
 {
-	if (HAS_PCH_SPLIT(dev_priv))
-		ibx_irq_pre_postinstall(dev_priv);
+	if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
+		icp_irq_postinstall(dev_priv);
+	else if (HAS_PCH_SPLIT(dev_priv))
+		ibx_irq_postinstall(dev_priv);
 
 	gen8_gt_irq_postinstall(&dev_priv->gt);
 	gen8_de_irq_postinstall(dev_priv);
@@ -3488,33 +3512,6 @@ static void gen8_irq_postinstall(struct drm_i915_private *dev_priv)
 	gen8_master_intr_enable(dev_priv->uncore.regs);
 }
 
-static void icp_irq_postinstall(struct drm_i915_private *dev_priv)
-{
-	u32 mask = SDE_GMBUS_ICP;
-
-	drm_WARN_ON(&dev_priv->drm, I915_READ(SDEIER) != 0);
-	I915_WRITE(SDEIER, 0xffffffff);
-	POSTING_READ(SDEIER);
-
-	gen3_assert_iir_is_zero(&dev_priv->uncore, SDEIIR);
-	I915_WRITE(SDEIMR, ~mask);
-
-	if (HAS_PCH_DG1(dev_priv))
-		icp_ddi_hpd_detection_setup(dev_priv, DG1_DDI_HPD_ENABLE_MASK);
-	else if (HAS_PCH_TGP(dev_priv)) {
-		icp_ddi_hpd_detection_setup(dev_priv, TGP_DDI_HPD_ENABLE_MASK);
-		icp_tc_hpd_detection_setup(dev_priv, TGP_TC_HPD_ENABLE_MASK);
-	} else if (HAS_PCH_JSP(dev_priv)) {
-		icp_ddi_hpd_detection_setup(dev_priv, TGP_DDI_HPD_ENABLE_MASK);
-	} else if (HAS_PCH_MCC(dev_priv)) {
-		icp_ddi_hpd_detection_setup(dev_priv, ICP_DDI_HPD_ENABLE_MASK);
-		icp_tc_hpd_detection_setup(dev_priv, ICP_TC_HPD_ENABLE(TC_PORT_1));
-	} else {
-		icp_ddi_hpd_detection_setup(dev_priv, ICP_DDI_HPD_ENABLE_MASK);
-		icp_tc_hpd_detection_setup(dev_priv, ICP_TC_HPD_ENABLE_MASK);
-	}
-}
-
 static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
 {
 	struct intel_uncore *uncore = &dev_priv->uncore;
-- 
2.17.1