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-rw-r--r--Documentation/usb/power-management.txt11
1 files changed, 6 insertions, 5 deletions
diff --git a/Documentation/usb/power-management.txt b/Documentation/usb/power-management.txt
index 4a15c90bc11d..0a94ffe17ab6 100644
--- a/Documentation/usb/power-management.txt
+++ b/Documentation/usb/power-management.txt
@@ -537,17 +537,18 @@ relevant attribute files are usb2_hardware_lpm and usb3_hardware_lpm.
537 can write y/Y/1 or n/N/0 to the file to enable/disable 537 can write y/Y/1 or n/N/0 to the file to enable/disable
538 USB2 hardware LPM manually. This is for test purpose mainly. 538 USB2 hardware LPM manually. This is for test purpose mainly.
539 539
540 power/usb3_hardware_lpm 540 power/usb3_hardware_lpm_u1
541 power/usb3_hardware_lpm_u2
541 542
542 When a USB 3.0 lpm-capable device is plugged in to a 543 When a USB 3.0 lpm-capable device is plugged in to a
543 xHCI host which supports link PM, it will check if U1 544 xHCI host which supports link PM, it will check if U1
544 and U2 exit latencies have been set in the BOS 545 and U2 exit latencies have been set in the BOS
545 descriptor; if the check is is passed and the host 546 descriptor; if the check is is passed and the host
546 supports USB3 hardware LPM, USB3 hardware LPM will be 547 supports USB3 hardware LPM, USB3 hardware LPM will be
547 enabled for the device and this file will be created. 548 enabled for the device and these files will be created.
548 The file holds a string value (enable or disable) 549 The files hold a string value (enable or disable)
549 indicating whether or not USB3 hardware LPM is 550 indicating whether or not USB3 hardware LPM U1 or U2
550 enabled for the device. 551 is enabled for the device.
551 552
552 USB Port Power Control 553 USB Port Power Control
553 ---------------------- 554 ----------------------