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Reduce polling interval for low-speed devices

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Fixes #7651, my Logitech gamepad works.

Change-Id: Ia3f92ba817576946dabee262a2fd5af8102a109f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2198
Reviewed-by: Stephan Aßmus <superstippi@gmx.de>
This commit is contained in:
Adrien Destugues 2020-02-04 20:02:05 +01:00 committed by Stephan Aßmus
parent 78fea2759f
commit 79ded8ca16
1 changed files with 7 additions and 2 deletions
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9
src/add-ons/kernel/busses/usb/ehci.cpp
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@ -2221,11 +2221,16 @@ EHCI::LinkInterruptQueueHead(ehci_qh *queueHead, Pipe *pipe)
queueHead->endpoint_caps |= (0xff << EHCI_QH_CAPS_ISM_SHIFT);
} else {
// As we do not yet support FSTNs to correctly reference low/full
// speed interrupt transfers, we simply put them into the 1 interval
// speed interrupt transfers, we simply put them into the 1 or 8 interval
// queue. This way we ensure that we reach them on every micro frame
// and can do the corresponding start/complete split transactions.
// ToDo: use FSTNs to correctly link non high speed interrupt transfers
interval = 1;
if (pipe->Speed() == USB_SPEED_LOWSPEED) {
// Low speed devices can't be polled faster than 8ms, so just use
// that.
interval = 4;
} else
interval = 1;
// For now we also force start splits to be in micro frame 0 and
// complete splits to be in micro frame 2, 3 and 4.