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| author | Mathias Nyman <[email protected]> | 2018-12-05 12:22:39 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2018-12-06 12:00:10 +0000 |
| commit | 0472bf06c6fd33c1a18aaead4c8f91e5a03d8d7b (patch) | |
| tree | 429aa5236402a508f3144670dda76beec5dd189a /drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | |
| parent | xhci: workaround CSS timeout on AMD SNPS 3.0 xHC (diff) | |
| download | kernel-0472bf06c6fd33c1a18aaead4c8f91e5a03d8d7b.tar.gz kernel-0472bf06c6fd33c1a18aaead4c8f91e5a03d8d7b.zip | |
xhci: Prevent U1/U2 link pm states if exit latency is too long
Don't allow USB3 U1 or U2 if the latency to wake up from the U-state
reaches the service interval for a periodic endpoint.
This is according to xhci 1.1 specification section 4.23.5.2 extra note:
"Software shall ensure that a device is prevented from entering a U-state
where its worst case exit latency approaches the ESIT."
Allowing too long exit latencies for periodic endpoint confuses xHC
internal scheduling, and new devices may fail to enumerate with a
"Not enough bandwidth for new device state" error from the host.
Cc: <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c')
0 files changed, 0 insertions, 0 deletions