diff options
| author | Ye Xiang <xiang.ye@intel.com> | 2021-06-13 06:25:07 +0300 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2021-07-15 21:49:09 +0300 |
| commit | e48bf29cf9d6d60d810e2af71e54b71a324094e0 (patch) | |
| tree | accc6d0cf319fcbb302e9ef2988e7f1fa22057d3 /drivers/hid/intel-ish-hid/ishtp/bus.c | |
| parent | df04fbe8680bfe07f3d7487eccff9f768bb02533 (diff) | |
| download | linux-e48bf29cf9d6d60d810e2af71e54b71a324094e0.tar.xz | |
HID: intel-ish-hid: use async resume function
ISH IPC driver uses asynchronous workqueue to do resume now, but there is
a potential timing issue: when child devices resume before bus driver, it
will cause child devices resume failed and cannot be recovered until
reboot. The current implementation in this case do wait for IPC to resume
but fail to accommodate for a case when there is no ISH reboot and soft
resume is taking time. This issue is apparent on Tiger Lake platform with
5.11.13 kernel when doing suspend to idle then resume(s0ix) test. To
resolve this issue, we change ISHTP HID client to use asynchronous resume
callback too. In the asynchronous resume callback, it waits for the ISHTP
resume done event, and then notify ISHTP HID client link ready.
Signed-off-by: Ye Xiang <xiang.ye@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/intel-ish-hid/ishtp/bus.c')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp/bus.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/bus.c b/drivers/hid/intel-ish-hid/ishtp/bus.c index f0802b047ed8..aa2c51624012 100644 --- a/drivers/hid/intel-ish-hid/ishtp/bus.c +++ b/drivers/hid/intel-ish-hid/ishtp/bus.c @@ -314,13 +314,6 @@ static int ishtp_cl_device_resume(struct device *dev) if (!device) return 0; - /* - * When ISH needs hard reset, it is done asynchrnously, hence bus - * resume will be called before full ISH resume - */ - if (device->ishtp_dev->resume_flag) - return 0; - driver = to_ishtp_cl_driver(dev->driver); if (driver && driver->driver.pm) { if (driver->driver.pm->resume) @@ -850,6 +843,28 @@ struct device *ishtp_device(struct ishtp_cl_device *device) EXPORT_SYMBOL(ishtp_device); /** + * ishtp_wait_resume() - Wait for IPC resume + * + * Wait for IPC resume + * + * Return: resume complete or not + */ +bool ishtp_wait_resume(struct ishtp_device *dev) +{ + /* 50ms to get resume response */ + #define WAIT_FOR_RESUME_ACK_MS 50 + + /* Waiting to get resume response */ + if (dev->resume_flag) + wait_event_interruptible_timeout(dev->resume_wait, + !dev->resume_flag, + msecs_to_jiffies(WAIT_FOR_RESUME_ACK_MS)); + + return (!dev->resume_flag); +} +EXPORT_SYMBOL_GPL(ishtp_wait_resume); + +/** * ishtp_get_pci_device() - Return PCI device dev pointer * This interface is used to return PCI device pointer * from ishtp_cl_device instance. |