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authorPaul Zimmerman <Paul.Zimmerman@synopsys.com>2011-02-28 18:11:27 -0800
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2011-03-13 18:23:57 -0700
commit500132a0f26ad7d9916102193cbc6c1b1becb373 (patch)
treec5b55f5afa88fb5b7820237a9de4c897b0c830e9 /include/linux/usb
parentba0a4d9aaae789a6a632968b27c21d49b858b13a (diff)
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USB: Add support for SuperSpeed isoc endpoints
Use the Mult and bMaxBurst values from the endpoint companion descriptor to calculate the max length of an isoc transfer. Add USB_SS_MULT macro to access Mult field of bmAttributes, at Sarah's suggestion. This patch should be queued for the 2.6.36 and 2.6.37 stable trees, since those were the first kernels to have isochronous support for SuperSpeed devices. Signed-off-by: Paul Zimmerman <paulz@synopsys.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@kernel.org
Diffstat (limited to 'include/linux/usb')
-rw-r--r--include/linux/usb/ch9.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 34316ba..b72f305 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -585,6 +585,8 @@ struct usb_ss_ep_comp_descriptor {
#define USB_DT_SS_EP_COMP_SIZE 6
/* Bits 4:0 of bmAttributes if this is a bulk endpoint */
#define USB_SS_MAX_STREAMS(p) (1 << ((p) & 0x1f))
+/* Bits 1:0 of bmAttributes if this is an isoc endpoint */
+#define USB_SS_MULT(p) (1 + ((p) & 0x3))
/*-------------------------------------------------------------------------*/