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| author | Jack Pham <jackp@qti.qualcomm.com> | 2025-03-06 11:03:55 -0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2025-03-18 20:29:20 +0000 |
| commit | f1a2bd23337b274dbc79826a07a742604ad26a7a (patch) | |
| tree | 60f3894cddc65d72c27f50e7793780b300102f73 /ArmVirtPkg/Library | |
| parent | 70db6510d1b40978dcb8877de55bc6915fa1145a (diff) | |
| download | edk2-master.zip edk2-master.tar.gz edk2-master.tar.bz2 | |
When a USB device is enumerated it will report one or more endpoint
descriptors which contains a bInterval field which specifies the
interval a host should periodically poll for that particular endpoint
when scheduling transfers. But the units this value is expressed in
(in whole ms, a power of 2 x 1ms, or a power of 2 x 125us) may differ
depending on the speed of the device and whether the endpoint is
isochronous or interrupt.
Some high/super-speed devices, which are supposed to report isoc/int
bInterval as a power of 2 x 125us, incorrectly report full-speed
bInterval values (that is, in whole units of ms) in their interrupt
endpoint descriptors which results in an assertion error due to being
out of range of the spec-expected values. Rather than asserting, try
to adjust those assuming they were expressed in units of ms with an
upper limit of 128ms.
Signed-off-by: Jack Pham <jackp@qti.qualcomm.com>
Diffstat (limited to 'ArmVirtPkg/Library')
0 files changed, 0 insertions, 0 deletions