From 500132a0f26ad7d9916102193cbc6c1b1becb373 Mon Sep 17 00:00:00 2001 From: Paul Zimmerman Date: Mon, 28 Feb 2011 18:11:27 -0800 Subject: [PATCH] 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 Signed-off-by: Sarah Sharp Cc: stable@kernel.org --- drivers/usb/core/urb.c | 11 ++++++++++- include/linux/usb/ch9.h | 2 ++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index c14fc082864f..ae334b067c13 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -366,7 +366,16 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) if (xfertype == USB_ENDPOINT_XFER_ISOC) { int n, len; - /* FIXME SuperSpeed isoc endpoints have up to 16 bursts */ + /* SuperSpeed isoc endpoints have up to 16 bursts of up to + * 3 packets each + */ + if (dev->speed == USB_SPEED_SUPER) { + int burst = 1 + ep->ss_ep_comp.bMaxBurst; + int mult = USB_SS_MULT(ep->ss_ep_comp.bmAttributes); + max *= burst; + max *= mult; + } + /* "high bandwidth" mode, 1-3 packets/uframe? */ if (dev->speed == USB_SPEED_HIGH) { int mult = 1 + ((max >> 11) & 0x03); diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h index 34316ba05f29..b72f305ce6bd 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)) /*-------------------------------------------------------------------------*/ -- 2.34.1