[PATCH 4/8] drm/i915/gt: Reapply ppgtt enabling after engine resets

[Chris Wilson]

The GFX_MODE is reset along with the engine, turning off ppGTT. We need
to re-enable it upon resume.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/gen6_ppgtt.c            |  9 ---------
 drivers/gpu/drm/i915/gt/intel_ring_submission.c | 13 ++++++++++---
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
index 680bd9442eb0..0f02afe7f43a 100644
--- a/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
+++ b/drivers/gpu/drm/i915/gt/gen6_ppgtt.c
@@ -27,8 +27,6 @@ void gen7_ppgtt_enable(struct intel_gt *gt)
 {
 	struct drm_i915_private *i915 = gt->i915;
 	struct intel_uncore *uncore = gt->uncore;
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
 	u32 ecochk;
 
 	intel_uncore_rmw(uncore, GAC_ECO_BITS, 0, ECOBITS_PPGTT_CACHE64B);
@@ -41,13 +39,6 @@ void gen7_ppgtt_enable(struct intel_gt *gt)
 		ecochk &= ~ECOCHK_PPGTT_GFDT_IVB;
 	}
 	intel_uncore_write(uncore, GAM_ECOCHK, ecochk);
-
-	for_each_engine(engine, gt, id) {
-		/* GFX_MODE is per-ring on gen7+ */
-		ENGINE_WRITE(engine,
-			     RING_MODE_GEN7,
-			     _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
-	}
 }
 
 void gen6_ppgtt_enable(struct intel_gt *gt)
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 90b483b4ae5d..d794e13610b2 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -188,9 +188,16 @@ static void set_pp_dir(struct intel_engine_cs *engine)
 {
 	struct i915_address_space *vm = vm_alias(engine->gt->vm);
 
-	if (vm) {
-		ENGINE_WRITE(engine, RING_PP_DIR_DCLV, PP_DIR_DCLV_2G);
-		ENGINE_WRITE(engine, RING_PP_DIR_BASE, pp_dir(vm));
+	if (!vm)
+		return;
+
+	ENGINE_WRITE(engine, RING_PP_DIR_DCLV, PP_DIR_DCLV_2G);
+	ENGINE_WRITE(engine, RING_PP_DIR_BASE, pp_dir(vm));
+
+	if (INTEL_GEN(engine->i915) >= 7) {
+		ENGINE_WRITE(engine,
+			     RING_MODE_GEN7,
+			     _MASKED_BIT_ENABLE(GFX_PPGTT_ENABLE));
 	}
 }
 
-- 
2.20.1