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
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 @@
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 @@
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 @@
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 @@
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 @@
}
}
- 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 @@
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 @@
mbox_free_channel(&mbox->chans[i]);
if (mbox->txdone_poll)
- del_timer_sync(&mbox->poll);
+ hrtimer_cancel(&mbox->poll_hrt);
mutex_unlock(&con_mutex);
}
diff --git a/include/linux/mailbox_controller.h b/include/linux/mailbox_controller.h
index 68c4245..74deadb 100644
--- a/include/linux/mailbox_controller.h
+++ b/include/linux/mailbox_controller.h
@@ -9,7 +9,7 @@
#include <linux/of.h>
#include <linux/types.h>
-#include <linux/timer.h>
+#include <linux/hrtimer.h>
#include <linux/device.h>
#include <linux/completion.h>
@@ -67,7 +67,8 @@
* @txpoll_period: If 'txdone_poll' is in effect, the API polls for
* last TX's status after these many millisecs
* @of_xlate: Controller driver specific mapping of channel via DT
- * @poll: API private. Used to poll for TXDONE on all channels.
+ * @poll_hrt: API private. hrtimer used to poll for TXDONE on all
+ * channels.
* @node: API private. To hook into list of controllers.
*/
struct mbox_controller {
@@ -81,7 +82,7 @@
struct mbox_chan *(*of_xlate)(struct mbox_controller *mbox,
const struct of_phandle_args *sp);
/* Internal to API */
- struct timer_list poll;
+ struct hrtimer poll_hrt;
struct list_head node;
};