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thunderbolt: Handle ring interrupt by reading interrupt status register 

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 (ISR) in the
MSI-X handler.

Signed-off-by: Basavaraj Natikar <Basavaraj.Natikar@amd.com>
Signed-off-by: Sanjay R Mehta <sanju.mehta@amd.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Sanjay R Mehta 2021-08-06 11:59:06 -05:00 committed by Mika Westerberg
parent e390909ac7
commit 7a1808f82a
1 changed files with 13 additions and 0 deletions
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13
drivers/thunderbolt/nhi.c
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@ -382,11 +382,24 @@ void tb_ring_poll_complete(struct tb_ring *ring)
}
EXPORT_SYMBOL_GPL(tb_ring_poll_complete);
static void ring_clear_msix(const struct tb_ring *ring)
{
if (ring->nhi->quirks & QUIRK_AUTO_CLEAR_INT)
return;
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);
ring_clear_msix(ring);
spin_lock(&ring->lock);
__ring_interrupt(ring);
spin_unlock(&ring->lock);