TUSB7340 windows driver (v1.12.24) can not accept LGO_U1

owen chung

my usb3.0 device will issue LGO_U1 to Host, but Host will always reject my request by LXU, can you modify driver to enable this behavior?

also, driver won't issue SET_FEATURE[U1_ENABLE] request to device, is there any reason of doing this (cause it decreases the flexibility of power management)?

i assume the driver will have to enable certain bit (ex. U1Enable) in xhci register in order to accept LGO_U1 request from device, right?

over 13 years ago

0 Elias Villegas M. over 13 years ago

TI__Guru* 76130 points

Hello Owen,

Unfortunately it is not that simple to change the driver, please go to below link to see a configuration option for power management.

Regards.

http://www.ti.com/lit/an/slla318/slla318.pdf

0 owen chung over 13 years ago in reply to Elias Villegas M.

Prodigy 30 points

Hi, i have tried the PCI 0xE8 setting, but it didn't work. i thought that is for PCI BUS power management (D0->D3), not for USB BUS power management (U0->U1).

i found NEC xhic will send SET_FEATURE[U1_ENABLE] and also accept LGO_U1 from device. Is there any other way to achieve these behaviors on TI xhci?

if not, i will have to use NEC xhci instead (for better power management). thanks.

0 -DK- over 13 years ago in reply to owen chung

TI__Mastermind 27890 points

Owen,

U1/U2 support is currently disabled in the driver as a large number of devices currently on the market do not properly implement U1/U2 which can result in a poor user experience.

TI plans to enable U1/U2 support once a mechanism for selectively excluding these problem devices has been identified.

0 owen chung over 13 years ago in reply to -DK-

Prodigy 30 points

Thank you for your reply

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TUSB7340 windows driver (v1.12.24) can not accept LGO_U1