[Intel-gfx] [PATCH 21/22] drm/i915/icl: WaForwardProgressSoftReset

[Oscar Mateo]

Avoids a hang during soft reset.

Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
Signed-off-by: Oscar Mateo <oscar.mateo at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 5 +++++
 drivers/gpu/drm/i915/intel_pm.c | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index af4fee2..408697b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9703,6 +9703,11 @@ enum skl_power_gate {
 #define GEN9_VEBOX_MOCS(i)	_MMIO(0xcb00 + (i) * 4)	/* Video MOCS registers */
 #define GEN9_BLT_MOCS(i)	_MMIO(0xcc00 + (i) * 4)	/* Blitter MOCS registers */
 
+#define GEN10_SCRATCH_LNCF2		_MMIO(0xb0a0)
+#define   PMFLUSHDONE_LNICRSDROP	(1 << 20)
+#define   PMFLUSH_GAPL3UNBLOCK		(1 << 21)
+#define   PMFLUSHDONE_LNEBLK		(1 << 22)
+
 /* gamt regs */
 #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
 #define   GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW  0x67F1427F /* max/min for LRA1/2 */
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1acc719..b1c00e5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -8581,6 +8581,14 @@ static void icl_init_clock_gating(struct drm_i915_private *dev_priv)
 		I915_WRITE(INF_UNIT_LEVEL_CLKGATE,
 			   (I915_READ(INF_UNIT_LEVEL_CLKGATE) |
 			    CGPSF_CLKGATE_DIS));
+
+	/* WaForwardProgressSoftReset:icl (pre-prod) */
+	if (IS_ICL_REVID(dev_priv, ICL_REVID_A0, ICL_REVID_B0))
+		I915_WRITE(GEN10_SCRATCH_LNCF2,
+			   (I915_READ(GEN10_SCRATCH_LNCF2) |
+			    PMFLUSHDONE_LNICRSDROP |
+			    PMFLUSH_GAPL3UNBLOCK |
+			    PMFLUSHDONE_LNEBLK));
 }
 
 static void cnl_init_clock_gating(struct drm_i915_private *dev_priv)
-- 
1.9.1