Revert "USB: xhci: fix U1/U2 handling for hardware with XHCI_INTEL_HOST quirk set"
This reverts commit 5d5323a6. That commit effectively disabled Intel host initiated U1/U2 lpm for devices with periodic endpoints. Before that commit we disabled host initiated U1/U2 lpm if the exit latency was larger than any periodic endpoint service interval, this is according to xhci spec xhci 1.1 specification section 4.23.5.2 After that commit we incorrectly checked that service interval was smaller than U1/U2 inactivity timeout. This is not relevant, and can't happen for Intel hosts as previously set U1/U2 timeout = 105% * service interval. Patch claimed it solved cases where devices can't be enumerated because of bandwidth issues. This might be true but it's a side effect of accidentally turning off lpm. exit latency calculations have been revised since then Signed-off-by:Mathias Nyman <mathias.nyman@linux.intel.com> Link: https://lore.kernel.org/r/20210820123503.2605901-5-mathias.nyman@linux.intel.comSigned-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Showing
Please register or sign in to comment