[PATCH 3/3] drm/panfrost: Stay in the threaded MMU IRQ handler until we've handled all IRQs

[Boris Brezillon]

Doing a hw-irq -> threaded-irq round-trip is counter-productive, stay
in the threaded irq handler as long as we can.

Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
---
 drivers/gpu/drm/panfrost/panfrost_mmu.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index 21e552d1ac71..65bc20628c4e 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
@@ -580,6 +580,8 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
 	u32 status = mmu_read(pfdev, MMU_INT_RAWSTAT);
 	int i, ret;
 
+again:
+
 	for (i = 0; status; i++) {
 		u32 mask = BIT(i) | BIT(i + 16);
 		u64 addr;
@@ -628,6 +630,11 @@ static irqreturn_t panfrost_mmu_irq_handler_thread(int irq, void *data)
 		status &= ~mask;
 	}
 
+	/* If we received new MMU interrupts, process them before returning. */
+	status = mmu_read(pfdev, MMU_INT_RAWSTAT);
+	if (status)
+		goto again;
+
 	mmu_write(pfdev, MMU_INT_MASK, ~0);
 	return IRQ_HANDLED;
 };
-- 
2.26.2