linux-kernel - [PATCH 5.4 29/78] drm/i915: Add Wa

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Date:   Tue, 14 Jan 2020 11:01:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Lionel Landwerlin <lionel.g.landwerlin@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Matt Atwood <matthew.s.atwood@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Subject: [PATCH 5.4 29/78] drm/i915: Add Wa_1407352427:icl,ehl

From: Matt Roper <matthew.d.roper@...el.com>

commit 25b79ad51bf04a8aa67b5bccd631fc05f963b8e0 upstream.

The workaround database now indicates we need to disable psdunit clock
gating as well.

v3:
 - Rebase on top of other workarounds that have landed.
 - Restrict cc:stable tag to 5.2+ since that's when ICL was first
   officially supported.

Bspec: 32354
Bspec: 33450
Bspec: 33451
Suggested-by: Lionel Landwerlin <lionel.g.landwerlin@...el.com>
Cc: stable@...r.kernel.org # v5.2+
Cc: Lionel Landwerlin <lionel.g.landwerlin@...el.com>
Cc: Lucas De Marchi <lucas.demarchi@...el.com>
Cc: Matt Atwood <matthew.s.atwood@...el.com>
Signed-off-by: Matt Roper <matthew.d.roper@...el.com>
Acked-by: Lionel Landwerlin <lionel.g.landwerlin@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191231190713.1549533-1-matthew.d.roper@intel.com
(cherry picked from commit 1cd21a7c5679015352e8a6f46813aced51d71bb8)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_reg.h |    4 ++++
 drivers/gpu/drm/i915/intel_pm.c |    3 +++
 2 files changed, 7 insertions(+)

--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4053,6 +4053,10 @@ enum {
 #define   HSUNIT_CLKGATE_DIS		REG_BIT(8)
 #define   VSUNIT_CLKGATE_DIS		REG_BIT(3)
 
+#define UNSLICE_UNIT_LEVEL_CLKGATE2	_MMIO(0x94e4)
+#define   VSUNIT_CLKGATE_DIS_TGL	REG_BIT(19)
+#define   PSDUNIT_CLKGATE_DIS		REG_BIT(5)
+
 #define INF_UNIT_LEVEL_CLKGATE		_MMIO(0x9560)
 #define   CGPSF_CLKGATE_DIS		(1 << 3)
 
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -9202,6 +9202,9 @@ static void icl_init_clock_gating(struct
 	intel_uncore_rmw(&dev_priv->uncore, UNSLICE_UNIT_LEVEL_CLKGATE,
 			 0, VSUNIT_CLKGATE_DIS | HSUNIT_CLKGATE_DIS);
 
+	/* Wa_1407352427:icl,ehl */
+	intel_uncore_rmw(&dev_priv->uncore, UNSLICE_UNIT_LEVEL_CLKGATE2,
+			 0, PSDUNIT_CLKGATE_DIS);
 }
 
 static void cnp_init_clock_gating(struct drm_i915_private *dev_priv)