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authorAndiry Xu <andiry.xu@amd.com>2011-09-23 14:19:51 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2011-09-26 15:51:10 -0700
commit9574323c39d1f8359a04843075d89c9f32d8b7e6 (patch)
tree38514abe7e4485face5fa1fb081c4a51a6f300c7 /drivers/usb/host/xhci-pci.c
parentfc71ff7583b14347fa1cb592b698f088ecff36e3 (diff)
downloadlinux-9574323c39d1f8359a04843075d89c9f32d8b7e6.tar.bz2
xHCI: test USB2 software LPM
This patch tests USB2 software LPM for a USB2 LPM-capable device. When a lpm-capable device is addressed, if the host also supports software LPM, apply a test by putting the device into L1 state and resume it to see if the device can do L1 suspend/resume successfully. If the device fails to enter L1 or resume from L1 state, it may not function normally and usbcore may disconnect and re-enumerate it. In this case, store the device's Vid and Pid information, make sure the host will not test LPM for it twice. The test result is per device/host. Some devices claim to be lpm-capable, but fail to enter L1 or resume. So the test is necessary. The xHCI 1.0 errata has modified the USB2.0 LPM implementation. It redefines the HIRD field to BESL, and adds another register Port Hardware LPM Control (PORTHLPMC). However, this should not affect the LPM behavior on xHC which does not implement 1.0 errata. USB2.0 LPM errata defines a new bit BESL in the device's USB 2.0 extension descriptor. If the device reports it uses BESL, driver should use BESL instead of HIRD for it. Signed-off-by: Andiry Xu <andiry.xu@amd.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/xhci-pci.c')
-rw-r--r--drivers/usb/host/xhci-pci.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index a1110996b76f..213a7d73b118 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -345,6 +345,10 @@ static const struct hc_driver xhci_pci_hc_driver = {
.hub_status_data = xhci_hub_status_data,
.bus_suspend = xhci_bus_suspend,
.bus_resume = xhci_bus_resume,
+ /*
+ * call back when device connected and addressed
+ */
+ .update_device = xhci_update_device,
};
/*-------------------------------------------------------------------------*/