From: Sanjay R Mehta <sanju.mehta@xxxxxxx>
As per USB4 specification by default "Disable ISR Auto-Clear" bit is set
to zero and the Tx/Rx ring interrupt status needs to be cleared.
Hence handle it by reading the "Interrupt status" register in the ISR.
Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@xxxxxxx>
Signed-off-by: Sanjay R Mehta <sanju.mehta@xxxxxxx>
---
drivers/thunderbolt/nhi.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index 7979638..56ac343 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -385,11 +385,25 @@ void tb_ring_poll_complete(struct tb_ring *ring)
}
EXPORT_SYMBOL_GPL(tb_ring_poll_complete);
+static void check_and_clear_intr_status(struct tb_ring *ring)
+{
+ if (!(ring->nhi->quirks & REG_DMA_MISC_INT_AUTO_CLEAR)) {
+ if (ring->is_tx)
+ ioread32(ring->nhi->iobase
+ + REG_RING_NOTIFY_BASE);
+ else
+ ioread32(ring->nhi->iobase
+ + REG_RING_NOTIFY_BASE
+ + 4 * (ring->nhi->hop_count / 32));
+ }
+}
+
static irqreturn_t ring_msix(int irq, void *data)
{
struct tb_ring *ring = data;
spin_lock(&ring->nhi->lock);
+ check_and_clear_intr_status(ring);
spin_lock(&ring->lock);
__ring_interrupt(ring);
spin_unlock(&ring->lock);
--
2.7.4
