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xHCI: Check host USB2 LPM capability

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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>
This commit is contained in:
Andiry Xu 2011-09-23 14:19:51 -07:00 committed by Greg Kroah-Hartman
parent 6fd4562178
commit fc71ff7583
3 changed files with 27 additions and 0 deletions
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6
drivers/usb/host/xhci-ext-caps.h
View File

@ -65,6 +65,12 @@
/* bits 1:2, 5:12, and 17:19 need to be preserved; bits 21:28 should be zero */
#define XHCI_LEGACY_DISABLE_SMI ((0x3 << 1) + (0xff << 5) + (0x7 << 17))
/* USB 2.0 xHCI 0.96 L1C capability - section 7.2.2.1.3.2 */
#define XHCI_L1C (1 << 16)
/* USB 2.0 xHCI 1.0 hardware LMP capability - section 7.2.2.1.3.2 */
#define XHCI_HLC (1 << 19)
/* command register values to disable interrupts and halt the HC */
/* start/stop HC execution - do not write unless HC is halted*/
#define XHCI_CMD_RUN (1 << 0)

17
drivers/usb/host/xhci-mem.c
View File

@ -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. */

4
drivers/usb/host/xhci.h
View File

@ -1459,6 +1459,10 @@ struct xhci_hcd {
/* Array of pointers to USB 2.0 PORTSC registers */
__le32 __iomem **usb2_ports;
unsigned int num_usb2_ports;
/* support xHCI 0.96 spec USB2 software LPM */
unsigned sw_lpm_support:1;
/* support xHCI 1.0 spec USB2 hardware LPM */
unsigned hw_lpm_support:1;
};
/* convert between an HCD pointer and the corresponding EHCI_HCD */