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mailbox: sprd: clear delivery flag before handling TX done

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[ Upstream commit c77661d60d ]

If there are any pending messages in the mailbox queue, they are sent
as soon as a TX done event arrives from the driver. This may trigger a
new delivery interrupt while the previous one is still being handled.
If the delivery status is cleared after this, the interrupt is lost.
To prevent this from happening, clear the delivery status immediately
after checking it and before any new messages are sent.

Signed-off-by: Otto Pflüger <otto.pflueger@abscue.de>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Otto Pflüger
2026-03-04 07:20:52 -05:00
committed by Sasha Levin
parent 4c4679b31b
commit e2809ad082
1 changed files with 5 additions and 5 deletions
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drivers/mailbox/sprd-mailbox.c
+5 -5
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@@ -167,6 +167,11 @@ static irqreturn_t sprd_mbox_inbox_isr(int irq, void *data)
return IRQ_NONE;
}
/* Clear FIFO delivery and overflow status first */
writel(fifo_sts &
(SPRD_INBOX_FIFO_DELIVER_MASK | SPRD_INBOX_FIFO_OVERLOW_MASK),
priv->inbox_base + SPRD_MBOX_FIFO_RST);
while (send_sts) {
id = __ffs(send_sts);
send_sts &= (send_sts - 1);
@@ -182,11 +187,6 @@ static irqreturn_t sprd_mbox_inbox_isr(int irq, void *data)
mbox_chan_txdone(chan, 0);
}
/* Clear FIFO delivery and overflow status */
writel(fifo_sts &
(SPRD_INBOX_FIFO_DELIVER_MASK | SPRD_INBOX_FIFO_OVERLOW_MASK),
priv->inbox_base + SPRD_MBOX_FIFO_RST);
/* Clear irq status */
writel(SPRD_MBOX_IRQ_CLR, priv->inbox_base + SPRD_MBOX_IRQ_STS);