USB: EHCI: create a "periodic schedule info" struct

This patch begins the process of unifying the scheduling parameters
that ehci-hcd uses for interrupt and isochronous transfers.  It
creates an ehci_per_sched structure, which will be stored in both
ehci_qh and ehci_iso_stream structures, and will contain the common
scheduling information needed for both.

Initially we merely create the new structure and move some existing
fields into it.  Later patches will add more fields and utilize these
structures in improved scheduling algorithms.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 16 insertions, 13 deletions

diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index b93eb59bb529..e2b64c40d94f 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -54,6 +54,19 @@ struct ehci_stats {
 	unsigned long		unlink;
 };
 
+/*
+ * Scheduling and budgeting information for periodic transfers, for both
+ * high-speed devices and full/low-speed devices lying behind a TT.
+ */
+struct ehci_per_sched {
+	struct usb_device	*udev;		/* access to the TT */
+	struct usb_host_endpoint *ep;
+	u16			tt_usecs;	/* time on the FS/LS bus */
+	u16			period;		/* actual period in frames */
+	u16			phase;		/* actual phase, frame part */
+	u8			phase_uf;	/* uframe part of the phase */
+	u8			usecs, c_usecs;	/* times on the HS bus */
+};
 #define NO_FRAME	29999			/* frame not assigned yet */
 
 /* ehci_hcd->lock guards shared data against other CPUs:
@@ -387,6 +400,7 @@ struct ehci_qh {
 	struct list_head	intr_node;	/* list of intr QHs */
 	struct ehci_qtd		*dummy;
 	struct list_head	unlink_node;
+	struct ehci_per_sched	ps;		/* scheduling info */
 
 	unsigned		unlink_cycle;
 
@@ -400,15 +414,8 @@ struct ehci_qh {
 	u8			xacterrs;	/* XactErr retry counter */
 #define	QH_XACTERR_MAX		32		/* XactErr retry limit */
 
-	/* periodic schedule info */
-	u8			usecs;		/* intr bandwidth */
 	u8			gap_uf;		/* uframes split/csplit gap */
-	u8			c_usecs;	/* ... split completion bw */
-	u16			tt_usecs;	/* tt downstream bandwidth */
-	unsigned short		period;		/* polling interval */
-	unsigned short		start;		/* where polling starts */
 
-	struct usb_device	*dev;		/* access to TT */
 	unsigned		is_out:1;	/* bulk or intr OUT */
 	unsigned		clearing_tt:1;	/* Clear-TT-Buf in progress */
 	unsigned		dequeue_during_giveback:1;
@@ -451,20 +458,16 @@ struct ehci_iso_stream {
 	u8			highspeed;
 	struct list_head	td_list;	/* queued itds/sitds */
 	struct list_head	free_list;	/* list of unused itds/sitds */
-	struct usb_device	*udev;
-	struct usb_host_endpoint *ep;
 
 	/* output of (re)scheduling */
+	struct ehci_per_sched	ps;		/* scheduling info */
 	unsigned		next_uframe;
 	__hc32			splits;
 
 	/* the rest is derived from the endpoint descriptor,
-	 * trusting urb->interval == f(epdesc->bInterval) and
 	 * including the extra info for hw_bufp[0..2]
 	 */
-	u8			usecs, c_usecs;
-	u16			interval;
-	u16			tt_usecs;
+	u16			uperiod;	/* period in uframes */
 	u16			maxp;
 	u16			raw_mask;
 	unsigned		bandwidth;