|author||Sarah Sharp <firstname.lastname@example.org>||2014-01-17 14:15:44 -0800|
|committer||Sarah Sharp <email@example.com>||2014-03-04 15:38:00 -0800|
usb/xhci: Change how we indicate a host supports Link PM.
The xHCI driver currently uses a USB core internal field, udev->lpm_capable, to indicate the xHCI driver knows how to calculate the LPM timeout values. If this value is set for the host controller udev, it means Link PM can be enabled for child devices under that host. Change the code so the xHCI driver isn't mucking with USB core internal fields. Instead, indicate the xHCI driver doesn't support Link PM on this host by clearing the U1 and U2 exit latencies in the roothub SuperSpeed Extended Capabilities BOS descriptor. The code to check for the roothub setting U1 and U2 exit latencies to zero will also disable LPM for external devices that do that same. This was already effectively done with commit ae8963adb4ad8c5f2a89ca1d99fb7bb721e7599f "usb: Don't enable LPM if the exit latency is zero." Leave that code in place, so that if a device sets one exit latency value to zero, but the other is set to a valid value, LPM is only enabled for the U1 or U2 state that had the valid value. This is the same behavior the code had before. Also, change messages about missing Link PM information from warning level to info level. Only print a warning about the first device that doesn't support LPM, to avoid log spam. Further, cleanup some unnecessary line breaks to help people to grep for the error messages. Signed-off-by: Sarah Sharp <firstname.lastname@example.org> Cc: Alan Stern <email@example.com>
Diffstat (limited to 'drivers/usb/host/xhci-pci.c')
1 files changed, 0 insertions, 6 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 04f986d9234f..6c03584ac15f 100644
@@ -222,12 +222,6 @@ static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
/* Roothub already marked as USB 3.0 speed */
- /* We know the LPM timeout algorithms for this host, let the USB core
- * enable and disable LPM for devices under the USB 3.0 roothub.
- if (xhci->quirks & XHCI_LPM_SUPPORT)
- hcd_to_bus(xhci->shared_hcd)->root_hub->lpm_capable = 1;