diff options
| author | Andiry Xu <andiry.xu@amd.com> | 2011-09-23 14:19:51 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-26 15:51:09 -0700 |
| commit | fc71ff7583b14347fa1cb592b698f088ecff36e3 (patch) | |
| tree | e10b2ea18dafac36f7da843c7d0d87cb0f2a8194 /drivers/usb/host/xhci-mem.c | |
| parent | 6fd4562178508a0949c9fdecd8558d8b10d671bd (diff) | |
xHCI: Check host USB2 LPM capability
Check the host's USB2 LPM capability.
USB2 software LPM support is optional for xHCI 0.96 hosts. xHCI 1.0 hosts
should support software LPM, and may support hardware LPM.
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-mem.c')
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index bc6ec0cb3c6..9c7ddf0f3a4 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1959,6 +1959,23 @@ static void xhci_add_in_port(struct xhci_hcd *xhci, unsigned int num_ports, if (port_offset == 0 || (port_offset + port_count - 1) > num_ports) /* WTF? "Valid values are ‘1’ to MaxPorts" */ return; + + /* Check the host's USB2 LPM capability */ + if ((xhci->hci_version == 0x96) && (major_revision != 0x03) && + (temp & XHCI_L1C)) { + xhci_dbg(xhci, "xHCI 0.96: support USB2 software lpm\n"); + xhci->sw_lpm_support = 1; + } + + if ((xhci->hci_version >= 0x100) && (major_revision != 0x03)) { + xhci_dbg(xhci, "xHCI 1.0: support USB2 software lpm\n"); + xhci->sw_lpm_support = 1; + if (temp & XHCI_HLC) { + xhci_dbg(xhci, "xHCI 1.0: support USB2 hardware lpm\n"); + xhci->hw_lpm_support = 1; + } + } + port_offset--; for (i = port_offset; i < (port_offset + port_count); i++) { /* Duplicate entry. Ignore the port if the revisions differ. */ |