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usb-core: Add LINEAR_FRAME_INTR_BINTERVAL USB quirk

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Some USB 2.0 devices erroneously report millisecond values in
bInterval. The generic config code manages to catch most of them,
but in some cases it's not completely enough.

The case at stake here is a USB 2.0 braille device, which wants to
announce 10ms and thus sets bInterval to 10, but with the USB 2.0
computation that yields to 64ms.  It happens that one can type fast
enough to reach this interval and get the device buffers overflown,
leading to problematic latencies.  The generic config code does not
catch this case because the 64ms is considered a sane enough value.

This change thus adds a USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL quirk
to mark devices which actually report milliseconds in bInterval,
and marks Vario Ultra devices as needing it.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Thibault
2017-03-13 20:50:08 +01:00
committed by Greg Kroah-Hartman
parent 4ce362711d
commit 3243367b20
3 changed files with 24 additions and 0 deletions
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6
include/linux/usb/quirks.h
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@@ -50,4 +50,10 @@
/* device can't handle Link Power Management */
#define USB_QUIRK_NO_LPM BIT(10)
/*
* Device reports its bInterval as linear frames instead of the
* USB 2.0 calculation.
*/
#define USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL BIT(11)
#endif /* __LINUX_USB_QUIRKS_H */