1 files changed, 24 insertions, 8 deletions

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index 846dd697c410..f38385fe76bb 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -231,6 +231,8 @@ void panfrost_mmu_reset(struct panfrost_device *pfdev)
 {
 	struct panfrost_mmu *mmu, *mmu_tmp;
 
+	clear_bit(PANFROST_COMP_BIT_MMU, pfdev->is_suspended);
+
 	spin_lock(&pfdev->as_lock);
 
 	pfdev->as_alloc_mask = 0;
@@ -670,6 +672,9 @@ static irqreturn_t panfrost_mmu_irq_handler(int irq, void *data)
 {
 	struct panfrost_device *pfdev = data;
 
+	if (test_bit(PANFROST_COMP_BIT_MMU, pfdev->is_suspended))
+		return IRQ_NONE;
+
 	if (!mmu_read(pfdev, MMU_INT_STAT))
 		return IRQ_NONE;
 
@@ -744,22 +749,25 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
 			status = mmu_read(pfdev, MMU_INT_RAWSTAT) & ~pfdev->as_faulty_mask;
 	}
 
-	spin_lock(&pfdev->as_lock);
-	mmu_write(pfdev, MMU_INT_MASK, ~pfdev->as_faulty_mask);
-	spin_unlock(&pfdev->as_lock);
+	/* Enable interrupts only if we're not about to get suspended */
+	if (!test_bit(PANFROST_COMP_BIT_MMU, pfdev->is_suspended)) {
+		spin_lock(&pfdev->as_lock);
+		mmu_write(pfdev, MMU_INT_MASK, ~pfdev->as_faulty_mask);
+		spin_unlock(&pfdev->as_lock);
+	}
 
 	return IRQ_HANDLED;
 };
 
 int panfrost_mmu_init(struct panfrost_device *pfdev)
 {
-	int err, irq;
+	int err;
 
-	irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu");
-	if (irq < 0)
-		return irq;
+	pfdev->mmu_irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "mmu");
+	if (pfdev->mmu_irq < 0)
+		return pfdev->mmu_irq;
 
-	err = devm_request_threaded_irq(pfdev->dev, irq,
+	err = devm_request_threaded_irq(pfdev->dev, pfdev->mmu_irq,
 					panfrost_mmu_irq_handler,
 					panfrost_mmu_irq_handler_thread,
 					IRQF_SHARED, KBUILD_MODNAME "-mmu",
@@ -777,3 +785,11 @@ void panfrost_mmu_fini(struct panfrost_device *pfdev)
 {
 	mmu_write(pfdev, MMU_INT_MASK, 0);
 }
+
+void panfrost_mmu_suspend_irq(struct panfrost_device *pfdev)
+{
+	set_bit(PANFROST_COMP_BIT_MMU, pfdev->is_suspended);
+
+	mmu_write(pfdev, MMU_INT_MASK, 0);
+	synchronize_irq(pfdev->mmu_irq);
+}