[PATCH 8/9] drm/i915/pxp: On MTL, KCR HW can be enabled instantly

Alan Previn alan.previn.teres.alexis at intel.com
Wed Jan 11 00:56:41 UTC 2023


On legacy platforms, KCR HW enabling is done at the time
the mei component interface is loaded. It's also disabled
during unbind. For MTL onwards, we don't need a separate
component driver to send FW messages via GSC-CS.

Thus, immediately enable KCR HW on PXP's init, fini
and resume.

Signed-off-by: Alan Previn <alan.previn.teres.alexis at intel.com>
---
 drivers/gpu/drm/i915/pxp/intel_pxp.c     | 52 ++++++++++++++++++------
 drivers/gpu/drm/i915/pxp/intel_pxp.h     |  4 +-
 drivers/gpu/drm/i915/pxp/intel_pxp_pm.c  | 10 ++---
 drivers/gpu/drm/i915/pxp/intel_pxp_tee.c | 13 +-----
 4 files changed, 49 insertions(+), 30 deletions(-)

diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index 809b49f59594..90e739345924 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -143,10 +143,12 @@ static void pxp_init_full(struct intel_pxp *pxp)
 	if (ret)
 		return;
 
-	if (pxp->uses_gsccs)
+	if (pxp->uses_gsccs) {
 		ret = intel_pxp_gsccs_init(pxp);
-	else
+		intel_pxp_init_hw(pxp, true);
+	} else {
 		ret = intel_pxp_tee_component_init(pxp);
+	}
 	if (ret)
 		goto out_context;
 
@@ -249,10 +251,12 @@ void intel_pxp_fini(struct drm_i915_private *i915)
 
 	i915->pxp->arb_is_valid = false;
 
-	if (i915->pxp->uses_gsccs)
+	if (i915->pxp->uses_gsccs) {
+		intel_pxp_fini_hw(i915->pxp, true);
 		intel_pxp_gsccs_fini(i915->pxp);
-	else
+	} else {
 		intel_pxp_tee_component_fini(i915->pxp);
+	}
 
 	destroy_vcs_context(i915->pxp);
 
@@ -304,8 +308,9 @@ int intel_pxp_start(struct intel_pxp *pxp)
 	if (!intel_pxp_is_enabled(pxp))
 		return -ENODEV;
 
-	if (wait_for(pxp_component_bound(pxp), 250))
-		return -ENXIO;
+	if (!pxp->uses_gsccs)
+		if (wait_for(pxp_component_bound(pxp), 250))
+			return -ENXIO;
 
 	mutex_lock(&pxp->arb_mutex);
 
@@ -331,16 +336,39 @@ int intel_pxp_start(struct intel_pxp *pxp)
 	return ret;
 }
 
-void intel_pxp_init_hw(struct intel_pxp *pxp)
+static void
+intel_pxp_hw_state_change(struct intel_pxp *pxp, bool enable,
+			  bool skip_if_runtime_pm_off)
+{
+	intel_wakeref_t wakeref;
+
+	if (skip_if_runtime_pm_off) {
+		/* if we are suspended, the HW will be re-initialized on resume */
+		wakeref = intel_runtime_pm_get_if_in_use(&pxp->ctrl_gt->i915->runtime_pm);
+		if (!wakeref)
+			return;
+	}
+
+	if (enable) {
+		kcr_pxp_enable(pxp);
+		intel_pxp_irq_enable(pxp);
+	} else {
+		kcr_pxp_disable(pxp);
+		intel_pxp_irq_disable(pxp);
+	}
+
+	if (skip_if_runtime_pm_off)
+		intel_runtime_pm_put(&pxp->ctrl_gt->i915->runtime_pm, wakeref);
+}
+
+void intel_pxp_init_hw(struct intel_pxp *pxp, bool skip_if_runtime_pm_off)
 {
-	kcr_pxp_enable(pxp);
-	intel_pxp_irq_enable(pxp);
+	intel_pxp_hw_state_change(pxp, true, skip_if_runtime_pm_off);
 }
 
-void intel_pxp_fini_hw(struct intel_pxp *pxp)
+void intel_pxp_fini_hw(struct intel_pxp *pxp, bool skip_if_runtime_pm_off)
 {
-	kcr_pxp_disable(pxp);
-	intel_pxp_irq_disable(pxp);
+	intel_pxp_hw_state_change(pxp, false, skip_if_runtime_pm_off);
 }
 
 int intel_pxp_key_check(struct intel_pxp *pxp,
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h
index 04440fada711..6c1fe3f0a20c 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h
@@ -20,8 +20,8 @@ bool intel_pxp_is_active(const struct intel_pxp *pxp);
 int intel_pxp_init(struct drm_i915_private *i915);
 void intel_pxp_fini(struct drm_i915_private *i915);
 
-void intel_pxp_init_hw(struct intel_pxp *pxp);
-void intel_pxp_fini_hw(struct intel_pxp *pxp);
+void intel_pxp_init_hw(struct intel_pxp *pxp, bool skip_if_runtime_pm_off);
+void intel_pxp_fini_hw(struct intel_pxp *pxp, bool skip_if_runtime_pm_off);
 
 void intel_pxp_mark_termination_in_progress(struct intel_pxp *pxp);
 
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
index 892d39cc61c1..94c1b2fe1eb2 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_pm.c
@@ -29,7 +29,7 @@ void intel_pxp_suspend(struct intel_pxp *pxp)
 		return;
 
 	with_intel_runtime_pm(&pxp->ctrl_gt->i915->runtime_pm, wakeref) {
-		intel_pxp_fini_hw(pxp);
+		intel_pxp_fini_hw(pxp, false);
 		pxp->hw_state_invalidated = false;
 	}
 }
@@ -40,14 +40,14 @@ void intel_pxp_resume(struct intel_pxp *pxp)
 		return;
 
 	/*
-	 * The PXP component gets automatically unbound when we go into S3 and
+	 * On Pre-MTL, PXP component gets automatically unbound when we go into S3 and
 	 * re-bound after we come out, so in that scenario we can defer the
 	 * hw init to the bind call.
 	 */
-	if (!pxp->pxp_component)
+	if (!pxp->uses_gsccs & !pxp->pxp_component)
 		return;
 
-	intel_pxp_init_hw(pxp);
+	intel_pxp_init_hw(pxp, false);
 }
 
 void intel_pxp_runtime_suspend(struct intel_pxp *pxp)
@@ -57,7 +57,7 @@ void intel_pxp_runtime_suspend(struct intel_pxp *pxp)
 
 	pxp->arb_is_valid = false;
 
-	intel_pxp_fini_hw(pxp);
+	intel_pxp_fini_hw(pxp, false);
 
 	pxp->hw_state_invalidated = false;
 }
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
index d50354bfb993..9b34f2056b19 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_tee.c
@@ -141,16 +141,9 @@ static int i915_pxp_tee_component_bind(struct device *i915_kdev,
 		}
 	}
 
-	/* if we are suspended, the HW will be re-initialized on resume */
-	wakeref = intel_runtime_pm_get_if_in_use(&i915->runtime_pm);
-	if (!wakeref)
-		return 0;
-
 	/* the component is required to fully start the PXP HW */
 	if (intel_pxp_is_enabled(pxp))
-		intel_pxp_init_hw(pxp);
-
-	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
+		intel_pxp_init_hw(pxp, true);
 
 	return ret;
 }
@@ -160,11 +153,9 @@ static void i915_pxp_tee_component_unbind(struct device *i915_kdev,
 {
 	struct drm_i915_private *i915 = kdev_to_i915(i915_kdev);
 	struct intel_pxp *pxp = i915->pxp;
-	intel_wakeref_t wakeref;
 
 	if (intel_pxp_is_enabled(pxp))
-		with_intel_runtime_pm_if_in_use(&i915->runtime_pm, wakeref)
-			intel_pxp_fini_hw(pxp);
+		intel_pxp_fini_hw(pxp, true);
 
 	mutex_lock(&pxp->tee_mutex);
 	pxp->pxp_component = NULL;
-- 
2.39.0



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