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greybus: loopback: add runtime pm support

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Add runtime pm to the loopback driver so that
the module wakes up from suspend while a test
is executed.

Testing Done: Let the module enter standby and
execute a loopback test.

Signed-off-by: Axel Haslam <haslam_axel@projectara.com>
Signed-off-by: David Lin <dtwlin@google.com>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Alex Elder <elder@linaro.org>
This commit is contained in:
Axel Haslam 2016-07-14 15:13:00 -05:00 committed by Alex Elder
parent 4c615dcc6a
commit e854ff58ed
1 changed files with 25 additions and 1 deletions
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26
drivers/staging/greybus/loopback.c
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@ -25,6 +25,7 @@
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>
#include <linux/pm_runtime.h>
#include <asm/div64.h>
@ -976,14 +977,26 @@ static int gb_loopback_fn(void *data)
int error = 0;
int us_wait = 0;
int type;
int ret;
u32 size;
struct gb_loopback *gb = data;
struct gb_bundle *bundle = gb->connection->bundle;
ret = gb_pm_runtime_get_sync(bundle);
if (ret)
return ret;
while (1) {
if (!gb->type)
if (!gb->type) {
gb_pm_runtime_put_autosuspend(bundle);
wait_event_interruptible(gb->wq, gb->type ||
kthread_should_stop());
ret = gb_pm_runtime_get_sync(bundle);
if (ret)
return ret;
}
if (kthread_should_stop())
break;
@ -1042,6 +1055,9 @@ static int gb_loopback_fn(void *data)
if (us_wait)
udelay(us_wait);
}
gb_pm_runtime_put_autosuspend(bundle);
return 0;
}
@ -1233,6 +1249,9 @@ static int gb_loopback_probe(struct gb_bundle *bundle,
spin_unlock_irqrestore(&gb_dev.lock, flags);
gb_connection_latency_tag_enable(connection);
gb_pm_runtime_put_autosuspend(bundle);
return 0;
out_kfifo1:
@ -1259,6 +1278,11 @@ static void gb_loopback_disconnect(struct gb_bundle *bundle)
{
struct gb_loopback *gb = greybus_get_drvdata(bundle);
unsigned long flags;
int ret;
ret = gb_pm_runtime_get_sync(bundle);
if (ret)
gb_pm_runtime_get_noresume(bundle);
gb_connection_disable(gb->connection);