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authorTomas Winkler <tomas.winkler@intel.com>2018-01-02 12:01:41 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-02-03 17:39:22 +0100
commite00c5c771877abdb70814ce555f020deab42bd46 (patch)
parent86eda3864a704a98d5444ae60654b898731bfea5 (diff)
mei: me: allow runtime pm for platform with D0i3
commit cc365dcf0e56271bedf3de95f88922abe248e951 upstream. >From the pci power documentation: "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. Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Reviewed-by: Alexander Usyskin <alexander.usyskin@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 78b3172c8e6e..d46cb1f0868f 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -238,8 +238,11 @@ static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
- if (mei_pg_is_enabled(dev))
+ if (mei_pg_is_enabled(dev)) {
+ if (hw->d0i3_supported)
+ pm_runtime_allow(&pdev->dev);
+ }
dev_dbg(&pdev->dev, "initialization successful.\n");