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| author | James P Michels III <james.p.michels@gmail.com> | 2014-07-27 13:28:04 -0400 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-02-20 00:49:39 +0000 |
| commit | cca4d731e2e9ccebb069b84c8aea70f15834a203 (patch) | |
| tree | 54f9c613561cb317ff378bfca951604cf5ab9ebd /drivers/usb/core | |
| parent | 4fe697c2b34b5740118a477db535f2fb1ab24467 (diff) | |
| download | kernel_samsung_smdk4412-cca4d731e2e9ccebb069b84c8aea70f15834a203.zip kernel_samsung_smdk4412-cca4d731e2e9ccebb069b84c8aea70f15834a203.tar.gz kernel_samsung_smdk4412-cca4d731e2e9ccebb069b84c8aea70f15834a203.tar.bz2 | |
usb-core bInterval quirk
commit cd83ce9e6195aa3ea15ab4db92892802c20df5d0 upstream.
This patch adds a usb quirk to support devices with interupt endpoints
and bInterval values expressed as microframes. The quirk causes the
parse endpoint function to modify the reported bInterval to a standards
conforming value.
There is currently code in the endpoint parser that checks for
bIntervals that are outside of the valid range (1-16 for USB 2+ high
speed and super speed interupt endpoints). In this case, the code assumes
the bInterval is being reported in 1ms frames. As well, the correction
is only applied if the original bInterval value is out of the 1-16 range.
With this quirk applied to the device, the bInterval will be
accurately adjusted from microframes to an exponent.
Signed-off-by: James P Michels III <james.p.michels@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/config.c | 11 | ||||
| -rw-r--r-- | drivers/usb/core/quirks.c | 4 |
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c index 1e3e211..0276db3 100644 --- a/drivers/usb/core/config.c +++ b/drivers/usb/core/config.c @@ -201,6 +201,17 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum, if (n == 0) n = 9; /* 32 ms = 2^(9-1) uframes */ j = 16; + + /* + * Adjust bInterval for quirked devices. + * This quirk fixes bIntervals reported in + * linear microframes. + */ + if (to_usb_device(ddev)->quirks & + USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL) { + n = clamp(fls(d->bInterval), i, j); + i = j = n; + } break; default: /* USB_SPEED_FULL or _LOW */ /* For low-speed, 10 ms is the official minimum. diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 3dbb18c..28ee079 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -150,6 +150,10 @@ static const struct usb_device_id usb_quirk_list[] = { /* SKYMEDI USB_DRIVE */ { USB_DEVICE(0x1516, 0x8628), .driver_info = USB_QUIRK_RESET_RESUME }, + /* Razer - Razer Blade Keyboard */ + { USB_DEVICE(0x1532, 0x0116), .driver_info = + USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL }, + /* BUILDWIN Photo Frame */ { USB_DEVICE(0x1908, 0x1315), .driver_info = USB_QUIRK_HONOR_BNUMINTERFACES }, |