xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

PCI / PM: Update runtime PM documentation for PCI devices

Browse Source 
Section 3.2 "Device Runtime Power Management" of pci.txt has become
outdated, so update it to correctly reflect the current code flow.

Also update the comment in local_pci_probe() to document the fact
that pm_runtime_put_noidle() is not the only runtime PM helper
function that can be used to decrement the device's runtime PM
usage counter in .probe().

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
This commit is contained in:
Rafael J. Wysocki
2015-09-18 03:08:40 +02:00
parent 1f93e4a96c
commit a8360062cc
2 changed files with 42 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/pci/pci-driver.c
View File

@@ -299,9 +299,10 @@ static long local_pci_probe(void *_ddi)
* Unbound PCI devices are always put in D0, regardless of
* runtime PM status. During probe, the device is set to
* active and the usage count is incremented. If the driver
* supports runtime PM, it should call pm_runtime_put_noidle()
* in its probe routine and pm_runtime_get_noresume() in its
* remove routine.
* supports runtime PM, it should call pm_runtime_put_noidle(),
* or any other runtime PM helper function decrementing the usage
* count, in its probe routine and pm_runtime_get_noresume() in
* its remove routine.
*/
pm_runtime_get_sync(dev);
pci_dev->driver = pci_drv;