diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2006-05-12 11:35:45 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-06-21 15:04:11 -0700 |
| commit | 84afddd7ac58adad00cb0e50d0af25fcf825668b (patch) | |
| tree | b528f0169ae61309ea4a0020bd53504f8faa827e /drivers/usb/host/uhci-hcd.h | |
| parent | 04538a255ac8b404c20cbf15867c9829254c470f (diff) | |
[PATCH] UHCI: Reimplement FSBR
This patch (as683) re-implements Full-Speed Bandwidth Reclamation (FSBR)
properly. It keeps track of which endpoint queues have advanced, and
when none have advanced for a sufficiently long time, FSBR is turned
off. The next TD on each of the non-moving queues is modified to
generate an interrupt on completion, so that FSBR can be re-enabled as
soon as the hardware starts to make some progress.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/uhci-hcd.h')
| -rw-r--r-- | drivers/usb/host/uhci-hcd.h | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h index 90ef7fbbf2fb..04938e64799f 100644 --- a/drivers/usb/host/uhci-hcd.h +++ b/drivers/usb/host/uhci-hcd.h @@ -84,6 +84,13 @@ #define CAN_SCHEDULE_FRAMES 1000 /* how far in the future frames * can be scheduled */ +/* When no queues need Full-Speed Bandwidth Reclamation, + * delay this long before turning FSBR off */ +#define FSBR_OFF_DELAY msecs_to_jiffies(400) + +/* If a queue hasn't advanced after this much time, assume it is stuck */ +#define QH_WAIT_TIMEOUT msecs_to_jiffies(200) + /* * Queue Headers @@ -131,6 +138,7 @@ struct uhci_qh { struct uhci_td *dummy_td; /* Dummy TD to end the queue */ struct uhci_td *post_td; /* Last TD completed */ + unsigned long advance_jiffies; /* Time of last queue advance */ unsigned int unlink_frame; /* When the QH was unlinked */ int state; /* QH_STATE_xxx; see above */ int type; /* Queue type (control, bulk, etc) */ @@ -138,6 +146,7 @@ struct uhci_qh { unsigned int initial_toggle:1; /* Endpoint's current toggle value */ unsigned int needs_fixup:1; /* Must fix the TD toggle values */ unsigned int is_stopped:1; /* Queue was stopped by error/unlink */ + unsigned int wait_expired:1; /* QH_WAIT_TIMEOUT has expired */ } __attribute__((aligned(16))); /* @@ -397,8 +406,7 @@ struct uhci_hcd { __le32 *frame; void **frame_cpu; /* CPU's frame list */ - int fsbr; /* Full-speed bandwidth reclamation */ - unsigned long fsbrtimeout; /* FSBR delay */ + unsigned long fsbr_jiffies; /* Time when FSBR was last wanted */ enum uhci_rh_state rh_state; unsigned long auto_stop_time; /* When to AUTO_STOP */ @@ -413,6 +421,7 @@ struct uhci_hcd { unsigned int working_RD:1; /* Suspended root hub doesn't need to be polled */ unsigned int is_initialized:1; /* Data structure is usable */ + unsigned int fsbr_is_on:1; /* FSBR is turned on */ /* Support for port suspend/resume/reset */ unsigned long port_c_suspend; /* Bit-arrays of ports */ @@ -451,7 +460,7 @@ struct urb_priv { struct uhci_qh *qh; /* QH for this URB */ struct list_head td_list; - unsigned fsbr : 1; /* URB turned on FSBR */ + unsigned fsbr:1; /* URB wants FSBR */ }; |