diff options
| author | Andrew Bresticker <abrestic@chromium.org> | 2014-10-30 21:01:07 +0100 |
|---|---|---|
| committer | Jassi Brar <jaswinder.singh@linaro.org> | 2014-11-27 07:51:27 +0100 |
| commit | 52a49306d7d19ef127e6d6f4fd92f84d4864296f (patch) | |
| tree | 9e6608b633caf55d6552b124654af4a16cb79d6f /drivers/mailbox/mailbox.c | |
| parent | Linux 3.18-rc3 (diff) | |
| download | linux-52a49306d7d19ef127e6d6f4fd92f84d4864296f.tar.xz linux-52a49306d7d19ef127e6d6f4fd92f84d4864296f.zip | |
mailbox: Don't unnecessarily re-arm the polling timer
poll_txdone() will unconditionally re-arm the polling timer if there was
an active request, even if the active request completed and no other
requests were submitted. This is fixed by:
- only re-arming the timer if the controller reported that the current
transmission has not completed, and,
- moving the call to poll_txdone() into msg_submit() so that the
controller gets polled (and the timer re-armed, if necessary) whenever
a new message is submitted.
Signed-off-by: Andrew Bresticker <abrestic@chromium.org>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
Diffstat (limited to 'drivers/mailbox/mailbox.c')
| -rw-r--r-- | drivers/mailbox/mailbox.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index afcb430508ec..c281e5562876 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -28,6 +28,8 @@ static LIST_HEAD(mbox_cons); static DEFINE_MUTEX(con_mutex); +static void poll_txdone(unsigned long data); + static int add_to_rbuf(struct mbox_chan *chan, void *mssg) { int idx; @@ -60,7 +62,7 @@ static void msg_submit(struct mbox_chan *chan) unsigned count, idx; unsigned long flags; void *data; - int err; + int err = -EBUSY; spin_lock_irqsave(&chan->lock, flags); @@ -84,6 +86,9 @@ static void msg_submit(struct mbox_chan *chan) } exit: spin_unlock_irqrestore(&chan->lock, flags); + + if (!err && chan->txdone_method == TXDONE_BY_POLL) + poll_txdone((unsigned long)chan->mbox); } static void tx_tick(struct mbox_chan *chan, int r) @@ -117,10 +122,11 @@ static void poll_txdone(unsigned long data) struct mbox_chan *chan = &mbox->chans[i]; if (chan->active_req && chan->cl) { - resched = true; txdone = chan->mbox->ops->last_tx_done(chan); if (txdone) tx_tick(chan, 0); + else + resched = true; } } @@ -252,9 +258,6 @@ int mbox_send_message(struct mbox_chan *chan, void *mssg) msg_submit(chan); - if (chan->txdone_method == TXDONE_BY_POLL) - poll_txdone((unsigned long)chan->mbox); - if (chan->cl->tx_block && chan->active_req) { unsigned long wait; int ret; |