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| author | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2011-09-13 16:41:13 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-09-20 12:33:50 -0700 |
| commit | 2b69899934c63b7b9432568584fb4c4a2924f40c (patch) | |
| tree | fd857f901beaf7c60b7015422aa5bc85e4a8eebe /drivers/usb/host/xhci.h | |
| parent | 170c026347c867a71e27713b98c58b266146c468 (diff) | |
| download | linux-2b69899934c63b7b9432568584fb4c4a2924f40c.tar.gz linux-2b69899934c63b7b9432568584fb4c4a2924f40c.tar.bz2 linux-2b69899934c63b7b9432568584fb4c4a2924f40c.zip | |
xhci: USB 3.0 BW checking.
The Intel Panther Point xHCI host tracks SuperSpeed endpoints in a
different way than USB 2.0/1.1 endpoints. The bandwidth interval tables
are not used, and instead the bandwidth is calculated in a very simple
way. Bandwidth for SuperSpeed endpoints is tracked individually in each
direction, since each direction has the full USB 3.0 bandwidth available.
10% of the bus bandwidth is reserved for non-periodic transfers.
This checking would be more complex if we had USB 3.0 LPM enabled, because
an additional latency for isochronous ping times need to be taken into
account. However, we don't have USB 3.0 LPM support in Linux yet.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 752a500f8695..2882074eb2c8 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -799,6 +799,7 @@ struct xhci_bw_info { /* Percentage of bus bandwidth reserved for non-periodic transfers */ #define FS_BW_RESERVED 10 #define HS_BW_RESERVED 20 +#define SS_BW_RESERVED 10 struct xhci_virt_ep { struct xhci_ring *ring; @@ -869,6 +870,8 @@ struct xhci_interval_bw_table { struct xhci_interval_bw interval_bw[XHCI_MAX_INTERVAL]; /* Includes reserved bandwidth for async endpoints */ unsigned int bw_used; + unsigned int ss_bw_in; + unsigned int ss_bw_out; }; |