[PATCH 5/6] accel/ivpu/40xx: Fix missing VPUIP interrupts

[Stanislaw Gruszka]

From: Karol Wachowski <karol.wachowski at linux.intel.com>

Move sequence of masking and unmasking global interrupts from buttress
interrupt handler to generic one that handles both VPUIP and BTRS
interrupts.

Unmasking global interrupts will re-trigger MSI for any pending interrupts.
Lack of this sequence can randomly cause to miss any VPUIP interrupt that
comes after reading VPU_40XX_HOST_SS_ICB_STATUS_0 and before clearing
all active interrupt sources.

Fixes: 79cdc56c4a54 ("accel/ivpu: Add initial support for VPU 4")
Signed-off-by: Karol Wachowski <karol.wachowski at linux.intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
---
 drivers/accel/ivpu/ivpu_hw_40xx.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/accel/ivpu/ivpu_hw_40xx.c b/drivers/accel/ivpu/ivpu_hw_40xx.c
index 87b1085d44cf..8bdb59a45da6 100644
--- a/drivers/accel/ivpu/ivpu_hw_40xx.c
+++ b/drivers/accel/ivpu/ivpu_hw_40xx.c
@@ -1059,9 +1059,6 @@ static irqreturn_t ivpu_hw_40xx_irqb_handler(struct ivpu_device *vdev, int irq)
 	if (status == 0)
 		return IRQ_NONE;
 
-	/* Disable global interrupt before handling local buttress interrupts */
-	REGB_WR32(VPU_40XX_BUTTRESS_GLOBAL_INT_MASK, 0x1);
-
 	if (REG_TEST_FLD(VPU_40XX_BUTTRESS_INTERRUPT_STAT, FREQ_CHANGE, status))
 		ivpu_dbg(vdev, IRQ, "FREQ_CHANGE");
 
@@ -1109,9 +1106,6 @@ static irqreturn_t ivpu_hw_40xx_irqb_handler(struct ivpu_device *vdev, int irq)
 	/* This must be done after interrupts are cleared at the source. */
 	REGB_WR32(VPU_40XX_BUTTRESS_INTERRUPT_STAT, status);
 
-	/* Re-enable global interrupt */
-	REGB_WR32(VPU_40XX_BUTTRESS_GLOBAL_INT_MASK, 0x0);
-
 	if (schedule_recovery)
 		ivpu_pm_schedule_recovery(vdev);
 
@@ -1123,9 +1117,14 @@ static irqreturn_t ivpu_hw_40xx_irq_handler(int irq, void *ptr)
 	struct ivpu_device *vdev = ptr;
 	irqreturn_t ret = IRQ_NONE;
 
+	REGB_WR32(VPU_40XX_BUTTRESS_GLOBAL_INT_MASK, 0x1);
+
 	ret |= ivpu_hw_40xx_irqv_handler(vdev, irq);
 	ret |= ivpu_hw_40xx_irqb_handler(vdev, irq);
 
+	/* Re-enable global interrupts to re-trigger MSI for pending interrupts */
+	REGB_WR32(VPU_40XX_BUTTRESS_GLOBAL_INT_MASK, 0x0);
+
 	if (ret & IRQ_WAKE_THREAD)
 		return IRQ_WAKE_THREAD;
 
-- 
2.25.1