diff options
Diffstat (limited to 'drivers/mailbox/mailbox.c')
| -rw-r--r-- | drivers/mailbox/mailbox.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 08ce9a1ab53a..6abb35ff49fa 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -284,6 +284,34 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg) EXPORT_SYMBOL_GPL(mbox_send_message); /** + * mbox_flush - flush a mailbox channel + * @chan: mailbox channel to flush + * @timeout: time, in milliseconds, to allow the flush operation to succeed + * + * Mailbox controllers that need to work in atomic context can implement the + * ->flush() callback to busy loop until a transmission has been completed. + * The implementation must call mbox_chan_txdone() upon success. Clients can + * call the mbox_flush() function at any time after mbox_send_message() to + * flush the transmission. After the function returns success, the mailbox + * transmission is guaranteed to have completed. + * + * Returns: 0 on success or a negative error code on failure. + */ +int mbox_flush(struct mbox_chan *chan, unsigned long timeout) +{ + int ret; + + if (!chan->mbox->ops->flush) + return -ENOTSUPP; + + ret = chan->mbox->ops->flush(chan, timeout); + if (ret < 0) + tx_tick(chan, ret); + + return ret; +} + +/** * mbox_request_channel - Request a mailbox channel. * @cl: Identity of the client requesting the channel. * @index: Index of mailbox specifier in 'mboxes' property. |