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| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2020-03-12 15:45:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-12 17:34:49 +0100 |
| commit | ceca49382ac20e06ce04c21279c7f2868c4ec1d4 (patch) | |
| tree | 4c5435efa61e65fd0f67716541b79d205b293d8c /init | |
| parent | xhci: Wait until link state trainsits to U0 after setting USB_SS_PORT_LS_U0 (diff) | |
| download | linux-ceca49382ac20e06ce04c21279c7f2868c4ec1d4.tar.xz linux-ceca49382ac20e06ce04c21279c7f2868c4ec1d4.zip | |
xhci: Finetune host initiated USB3 rootport link suspend and resume
Depending on the current link state the steps to resume the link to U0
varies. The normal case when a port is suspended (U3) we set the link
to U0 and wait for a port event when U3exit completed and port moved to
U0.
If the port is in U1/U2, then no event is issued, just set link to U0
If port is in Resume or Recovery state then the device has already
initiated resume, and this host initiated resume is racing against it.
Port event handler for device initiated resume will set link to U0,
just wait for the port to reach U0 before returning.
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200312144517.1593-9-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions