patch "mei: me: allow runtime pm for platform with D0i3" added to char-misc-testing

This is a note to let you know that I've just added the patch titled

mei: me: allow runtime pm for platform with D0i3

to my char-misc git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git
in the char-misc-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the char-misc-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From: Tomas Winkler <[email protected]>
Date: Tue, 2 Jan 2018 12:01:41 +0200
Subject: mei: me: allow runtime pm for platform with D0i3

"The driver itself should not call pm_runtime_allow(), though. Instead, it should let user space or some platform-specific code do that (user space can do it via sysfs as stated above)..."

However, the S0ix residency cannot be reached without MEI device getting into low power state. Hence, for mei devices that support D0i3, it's better to make runtime power management mandatory and not rely on the system integration such as udev rules.
This policy cannot be applied globally as some older platforms were found to have broken power management.

---
 drivers/misc/mei/pci-me.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

index f4f17552c9b8..4a0ccda4d04b 100644
@@ -238,8 +238,11 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 */
 	mei_me_set_pm_domain(dev);
 
-	if (mei_pg_is_enabled(dev))
+	if (mei_pg_is_enabled(dev)) {
 		pm_runtime_put_noidle(&pdev->dev);
+		if (hw->d0i3_supported)
+			pm_runtime_allow(&pdev->dev);
+	}
 
 	dev_dbg(&pdev->dev, "initialization successful.\n");
 

2.15.1