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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-05 18:11:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-05 18:11:04 -0700
commite3a98ac47698bf1c1e4e6fae72afc9866953fce5 (patch)
treea33ba55286b55bcc092eac441071494c6ac17479 /drivers/mailbox
parent2a013e37ce691a7c072df27b35e9790fc8f5a82f (diff)
parent86e488adaab77a733b01e759bf7bfda054479660 (diff)
downloadop-kernel-dev-e3a98ac47698bf1c1e4e6fae72afc9866953fce5.zip
op-kernel-dev-e3a98ac47698bf1c1e4e6fae72afc9866953fce5.tar.gz
Merge branch 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration
Pull mailbox updates from Jassi Brar: "Mainly we move from jiffy based timer to HRTIMER for finer control over polling. Then a controller reduces its polling period from 10 to 1ms" * 'mailbox-for-next' of git://git.linaro.org/landing-teams/working/fujitsu/integration: mailbox: arm_mhu: reduce txpoll_period from 10ms to 1 ms mailbox: switch to hrtimer for tx_complete polling mailbox: Drop owner assignment from platform_driver
Diffstat (limited to 'drivers/mailbox')
-rw-r--r--drivers/mailbox/arm_mhu.c2
-rw-r--r--drivers/mailbox/bcm2835-mailbox.c1
-rw-r--r--drivers/mailbox/mailbox.c27
3 files changed, 16 insertions, 14 deletions
diff --git a/drivers/mailbox/arm_mhu.c b/drivers/mailbox/arm_mhu.c
index d0d0b03..99befa7 100644
--- a/drivers/mailbox/arm_mhu.c
+++ b/drivers/mailbox/arm_mhu.c
@@ -148,7 +148,7 @@ static int mhu_probe(struct amba_device *adev, const struct amba_id *id)
mhu->mbox.ops = &mhu_ops;
mhu->mbox.txdone_irq = false;
mhu->mbox.txdone_poll = true;
- mhu->mbox.txpoll_period = 10;
+ mhu->mbox.txpoll_period = 1;
amba_set_drvdata(adev, mhu);
diff --git a/drivers/mailbox/bcm2835-mailbox.c b/drivers/mailbox/bcm2835-mailbox.c
index 0b47dd4..cfb4b44 100644
--- a/drivers/mailbox/bcm2835-mailbox.c
+++ b/drivers/mailbox/bcm2835-mailbox.c
@@ -204,7 +204,6 @@ MODULE_DEVICE_TABLE(of, bcm2835_mbox_of_match);
static struct platform_driver bcm2835_mbox_driver = {
.driver = {
.name = "bcm2835-mbox",
- .owner = THIS_MODULE,
.of_match_table = bcm2835_mbox_of_match,
},
.probe = bcm2835_mbox_probe,
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index c7fdb57..6a4811f 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -26,8 +26,6 @@
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;
@@ -88,7 +86,9 @@ exit:
spin_unlock_irqrestore(&chan->lock, flags);
if (!err && (chan->txdone_method & TXDONE_BY_POLL))
- poll_txdone((unsigned long)chan->mbox);
+ /* kick start the timer immediately to avoid delays */
+ hrtimer_start(&chan->mbox->poll_hrt, ktime_set(0, 0),
+ HRTIMER_MODE_REL);
}
static void tx_tick(struct mbox_chan *chan, int r)
@@ -112,9 +112,10 @@ static void tx_tick(struct mbox_chan *chan, int r)
complete(&chan->tx_complete);
}
-static void poll_txdone(unsigned long data)
+static enum hrtimer_restart txdone_hrtimer(struct hrtimer *hrtimer)
{
- struct mbox_controller *mbox = (struct mbox_controller *)data;
+ struct mbox_controller *mbox =
+ container_of(hrtimer, struct mbox_controller, poll_hrt);
bool txdone, resched = false;
int i;
@@ -130,9 +131,11 @@ static void poll_txdone(unsigned long data)
}
}
- if (resched)
- mod_timer(&mbox->poll, jiffies +
- msecs_to_jiffies(mbox->txpoll_period));
+ if (resched) {
+ hrtimer_forward_now(hrtimer, ms_to_ktime(mbox->txpoll_period));
+ return HRTIMER_RESTART;
+ }
+ return HRTIMER_NORESTART;
}
/**
@@ -451,9 +454,9 @@ int mbox_controller_register(struct mbox_controller *mbox)
txdone = TXDONE_BY_ACK;
if (txdone == TXDONE_BY_POLL) {
- mbox->poll.function = &poll_txdone;
- mbox->poll.data = (unsigned long)mbox;
- init_timer(&mbox->poll);
+ hrtimer_init(&mbox->poll_hrt, CLOCK_MONOTONIC,
+ HRTIMER_MODE_REL);
+ mbox->poll_hrt.function = txdone_hrtimer;
}
for (i = 0; i < mbox->num_chans; i++) {
@@ -495,7 +498,7 @@ void mbox_controller_unregister(struct mbox_controller *mbox)
mbox_free_channel(&mbox->chans[i]);
if (mbox->txdone_poll)
- del_timer_sync(&mbox->poll);
+ hrtimer_cancel(&mbox->poll_hrt);
mutex_unlock(&con_mutex);
}
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