e1000e / PCI / PM: Add basic runtime PM support (rev. 4)

Use the PCI runtime power management framework to add basic PCI
runtime PM support to the e1000e driver.  Namely, make the driver
suspend the device when the link is off and set it up for generating
a wakeup event after the link has been detected again.  [This
feature is disabled until the user space enables it with the help of
the /sys/devices/.../power/contol device attribute.]

Based on a patch from Matthew Garrett.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/net/e1000e/e1000.h b/drivers/net/e1000e/e1000.h
index c2ec095d216..8da190b930a 100644
--- a/drivers/net/e1000e/e1000.h
+++ b/drivers/net/e1000e/e1000.h
@@ -158,6 +158,9 @@ struct e1000_info;
 #define HV_M_STATUS_SPEED_1000            0x0200
 #define HV_M_STATUS_LINK_UP               0x0040
 
+/* Time to wait before putting the device into D3 if there's no link (in ms). */
+#define LINK_TIMEOUT            100
+
 enum e1000_boards {
         board_82571,
         board_82572,
@@ -370,6 +373,8 @@ struct e1000_adapter {
         struct work_struct update_phy_task;
         struct work_struct led_blink_task;
         struct work_struct print_hang_task;
+
+        bool idle_check;
 };
 
 struct e1000_info {