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-rw-r--r--drivers/mailbox/bcm-flexrm-mailbox.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index ae6146311934..f052a3eb2098 100644
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -1365,8 +1365,8 @@ static void flexrm_shutdown(struct mbox_chan *chan)
/* Disable/inactivate ring */
writel_relaxed(0x0, ring->regs + RING_CONTROL);
- /* Flush ring with timeout of 1s */
- timeout = 1000;
+ /* Set ring flush state */
+ timeout = 1000; /* timeout of 1s */
writel_relaxed(BIT(CONTROL_FLUSH_SHIFT),
ring->regs + RING_CONTROL);
do {
@@ -1374,7 +1374,23 @@ static void flexrm_shutdown(struct mbox_chan *chan)
FLUSH_DONE_MASK)
break;
mdelay(1);
- } while (timeout--);
+ } while (--timeout);
+ if (!timeout)
+ dev_err(ring->mbox->dev,
+ "setting ring%d flush state timedout\n", ring->num);
+
+ /* Clear ring flush state */
+ timeout = 1000; /* timeout of 1s */
+ writel_relaxed(0x0, ring + RING_CONTROL);
+ do {
+ if (!(readl_relaxed(ring + RING_FLUSH_DONE) &
+ FLUSH_DONE_MASK))
+ break;
+ mdelay(1);
+ } while (--timeout);
+ if (!timeout)
+ dev_err(ring->mbox->dev,
+ "clearing ring%d flush state timedout\n", ring->num);
/* Abort all in-flight requests */
for (reqid = 0; reqid < RING_MAX_REQ_COUNT; reqid++) {