lkml.org 
[lkml]   [2019]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v1 05/11] ti948: Add alive check function using schedule_delayed_work()
Date
This simply runs the function once every 5 seconds, while the
device is supposed to be active. The alive check function is
currently simply a stub, that logs it has been called, and
re-inserts itself into the work queue.

Signed-off-by: Michael Drake <michael.drake@codethink.co.uk>
Cc: Patrick Glaser <pglaser@tesla.com>
Cc: Nate Case <ncase@tesla.com>
---
drivers/gpu/drm/bridge/ti948.c | 37 +++++++++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ti948.c b/drivers/gpu/drm/bridge/ti948.c
index 9cb37215f049..86daa3701b91 100644
--- a/drivers/gpu/drm/bridge/ti948.c
+++ b/drivers/gpu/drm/bridge/ti948.c
@@ -16,6 +16,7 @@

#include <linux/regulator/consumer.h>
#include <linux/of_device.h>
+#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/delay.h>
@@ -25,6 +26,9 @@
/* Number of times to try checking for device on bringup. */
#define TI948_DEVICE_ID_TRIES 10

+/* Alive check every 5 seconds. */
+#define TI948_ALIVE_CHECK_DELAY (5 * HZ)
+
/**
* enum ti948_reg - TI948 registers.
*
@@ -374,9 +378,27 @@ static inline struct ti948_ctx *ti948_ctx_from_dev(struct device *dev)
return i2c_get_clientdata(client);
}

+static inline struct ti948_ctx *delayed_work_to_ti948_ctx(
+ struct delayed_work *dwork)
+{
+ return container_of(dwork, struct ti948_ctx, alive_check);
+}
+
+static void ti948_alive_check(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct ti948_ctx *ti948 = delayed_work_to_ti948_ctx(dwork);
+
+ dev_info(&ti948->i2c->dev, "%s Alive check!\n", __func__);
+
+ /* Reschedule ourself for the next check. */
+ schedule_delayed_work(&ti948->alive_check, TI948_ALIVE_CHECK_DELAY);
+}
+
static int ti948_pm_resume(struct device *dev)
{
struct ti948_ctx *ti948 = ti948_ctx_from_dev(dev);
+ bool scheduled;
int ret;

if (ti948 == NULL)
@@ -386,7 +408,18 @@ static int ti948_pm_resume(struct device *dev)
if (ret != 0)
return ret;

- return ti948_write_config_seq(ti948);
+ ret = ti948_write_config_seq(ti948);
+ if (ret != 0)
+ return ret;
+
+ INIT_DELAYED_WORK(&ti948->alive_check, ti948_alive_check);
+
+ scheduled = schedule_delayed_work(
+ &ti948->alive_check, TI948_ALIVE_CHECK_DELAY);
+ if (!scheduled)
+ dev_warn(&ti948->i2c->dev, "Alive check already scheduled\n");
+
+ return 0;
}

static int ti948_pm_suspend(struct device *dev)
@@ -396,6 +429,8 @@ static int ti948_pm_suspend(struct device *dev)
if (ti948 == NULL)
return 0;

+ cancel_delayed_work_sync(&ti948->alive_check);
+
return ti948_power_off(ti948);
}

--
2.20.1
\
 
 \ /
  Last update: 2019-06-11 16:05    [W:0.104 / U:24.836 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site