CONFIG_USB_EHCI_TT_NEWSCHED: Improved Transaction Translator scheduling

General informations

The Linux kernel configuration item CONFIG_USB_EHCI_TT_NEWSCHED has multiple definitions:

Improved Transaction Translator scheduling found in drivers/usb/host/Kconfig

The configuration item CONFIG_USB_EHCI_TT_NEWSCHED:

• prompt: Improved Transaction Translator scheduling
• type: bool
• depends on: CONFIG_USB_EHCI_HCD
• defined in drivers/usb/host/Kconfig
• found in Linux kernels: 2.6.36–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.11, 6.12-rc+HEAD

Help text

This changes the periodic scheduling code to fill more of the low and full speed bandwidth available from the Transaction Translator (TT) in USB 2.0 hubs. Without this, only one transfer will be issued in each microframe, significantly reducing the number of periodic low/fullspeed transfers possible.

If you have multiple periodic low/fullspeed devices connected to a highspeed USB hub which is connected to a highspeed USB Host Controller, and some of those devices will not work correctly (possibly due to "ENOSPC" or "-28" errors), say Y. Conversely, if you have only one such device and it doesn't work, you could try saying N.

If unsure, say Y.

Improved Transaction Translator scheduling (EXPERIMENTAL) found in drivers/usb/host/Kconfig

The configuration item CONFIG_USB_EHCI_TT_NEWSCHED:

• prompt: Improved Transaction Translator scheduling (EXPERIMENTAL)
• type: bool
• depends on: CONFIG_USB_EHCI_HCD && CONFIG_EXPERIMENTAL
• defined in drivers/usb/host/Kconfig
• found in Linux kernels: 2.6.18–2.6.35

Help text

This changes the periodic scheduling code to fill more of the low and full speed bandwidth available from the Transaction Translator (TT) in USB 2.0 hubs. Without this, only one transfer will be issued in each microframe, significantly reducing the number of periodic low/fullspeed transfers possible.

If you have multiple periodic low/fullspeed devices connected to a highspeed USB hub which is connected to a highspeed USB Host Controller, and some of those devices will not work correctly (possibly due to "ENOSPC" or "-28" errors), say Y.

If unsure, say N.

Hardware

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