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authorAlan Stern <stern@rowland.harvard.edu>2016-09-16 10:24:26 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-16 16:29:41 +0200
commit08c5cd37480f59ea39682f4585d92269be6b1424 (patch)
treeef69ed0b3c7f5805ac80eba1d9b01ccd6be2046d
parented3d6d0ac036bcff6e4649a6f8fb987bb4e34444 (diff)
downloadlinux-stericsson-08c5cd37480f59ea39682f4585d92269be6b1424.tar.gz
USB: change bInterval default to 10 ms
Some full-speed mceusb infrared transceivers contain invalid endpoint descriptors for their interrupt endpoints, with bInterval set to 0. In the past they have worked out okay with the mceusb driver, because the driver sets the bInterval field in the descriptor to 1, overwriting whatever value may have been there before. However, this approach was never sanctioned by the USB core, and in fact it does not work with xHCI controllers, because they use the bInterval value that was present when the configuration was installed. Currently usbcore uses 32 ms as the default interval if the value in the endpoint descriptor is invalid. It turns out that these IR transceivers don't work properly unless the interval is set to 10 ms or below. To work around this mceusb problem, this patch changes the endpoint-descriptor parsing routine, making the default interval value be 10 ms rather than 32 ms. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Tested-by: Wade Berrier <wberrier@gmail.com> CC: <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/core/config.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/usb/core/config.c b/drivers/usb/core/config.c
index 15ce4ab11688..a2d90aca779f 100644
--- a/drivers/usb/core/config.c
+++ b/drivers/usb/core/config.c
@@ -240,8 +240,10 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
memcpy(&endpoint->desc, d, n);
INIT_LIST_HEAD(&endpoint->urb_list);
- /* Fix up bInterval values outside the legal range. Use 32 ms if no
- * proper value can be guessed. */
+ /*
+ * Fix up bInterval values outside the legal range.
+ * Use 10 or 8 ms if no proper value can be guessed.
+ */
i = 0; /* i = min, j = max, n = default */
j = 255;
if (usb_endpoint_xfer_int(d)) {
@@ -250,13 +252,15 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
case USB_SPEED_SUPER_PLUS:
case USB_SPEED_SUPER:
case USB_SPEED_HIGH:
- /* Many device manufacturers are using full-speed
+ /*
+ * Many device manufacturers are using full-speed
* bInterval values in high-speed interrupt endpoint
- * descriptors. Try to fix those and fall back to a
- * 32 ms default value otherwise. */
+ * descriptors. Try to fix those and fall back to an
+ * 8-ms default value otherwise.
+ */
n = fls(d->bInterval*8);
if (n == 0)
- n = 9; /* 32 ms = 2^(9-1) uframes */
+ n = 7; /* 8 ms = 2^(7-1) uframes */
j = 16;
/*
@@ -271,10 +275,12 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
}
break;
default: /* USB_SPEED_FULL or _LOW */
- /* For low-speed, 10 ms is the official minimum.
+ /*
+ * For low-speed, 10 ms is the official minimum.
* But some "overclocked" devices might want faster
- * polling so we'll allow it. */
- n = 32;
+ * polling so we'll allow it.
+ */
+ n = 10;
break;
}
} else if (usb_endpoint_xfer_isoc(d)) {
@@ -282,10 +288,10 @@ static int usb_parse_endpoint(struct device *ddev, int cfgno, int inum,
j = 16;
switch (to_usb_device(ddev)->speed) {
case USB_SPEED_HIGH:
- n = 9; /* 32 ms = 2^(9-1) uframes */
+ n = 7; /* 8 ms = 2^(7-1) uframes */
break;
default: /* USB_SPEED_FULL */
- n = 6; /* 32 ms = 2^(6-1) frames */
+ n = 4; /* 8 ms = 2^(4-1) frames */
break;
}
}