diff options
| author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2017-03-13 20:50:08 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2017-07-18 18:40:14 +0100 |
| commit | f7fdc5e2f2d2a6432f8023aaac174d16d5243781 (patch) | |
| tree | 242ad3986aaadf84133eb12c82855000b1b6dd1e | |
| parent | 9c313915e8c23e83995325c482180104af384956 (diff) | |
usb-core: Add LINEAR_FRAME_INTR_BINTERVAL USB quirk
commit 3243367b209faed5c320a4e5f9a565ee2a2ba958 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | drivers/usb/core/config.c | 10 | ||||
| -rw-r--r-- | drivers/usb/core/quirks.c | 8 | ||||
| -rw-r--r-- | include/linux/usb/quirks.h | 6 |
3 files changed, 24 insertions, 0 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index 13d8c60c286a..627038883c55 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -245,6 +245,16 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, /* * Adjust bInterval for quirked devices. + */ + /* + * This quirk fixes bIntervals reported in ms. + */ + if (to_usb_device(ddev)->quirks & + USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL) { + n = clamp(fls(d->bInterval) + 3, i, j); + i = j = n; + } + /* * This quirk fixes bIntervals reported in * linear microframes. */ diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 3a010c19e0ec..3a5a4f49e894 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -167,6 +167,14 @@ static const struct usb_device_id usb_quirk_list[] = { /* M-Systems Flash Disk Pioneers */ { USB_DEVICE(0x08ec, 0x1000), .driver_info = USB_QUIRK_RESET_RESUME }, + /* Baum Vario Ultra */ + { USB_DEVICE(0x0904, 0x6101), .driver_info = + USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL }, + { USB_DEVICE(0x0904, 0x6102), .driver_info = + USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL }, + { USB_DEVICE(0x0904, 0x6103), .driver_info = + USB_QUIRK_LINEAR_FRAME_INTR_BINTERVAL }, + /* Keytouch QWERTY Panel keyboard */ { USB_DEVICE(0x0926, 0x3333), .driver_info = USB_QUIRK_CONFIG_INTF_STRINGS }, diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h index 8f4f2214652f..b54fdcb52b1c 100644 --- a/include/linux/usb/quirks.h +++ b/include/linux/usb/quirks.h @@ -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 */ |