diff options
| author | Mathias Nyman <mathias.nyman@linux.intel.com> | 2013-05-23 17:14:30 +0300 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2013-06-05 16:48:24 -0700 |
| commit | a558ccdcc71c7770c5e80c926a31cfe8a3892a09 (patch) | |
| tree | dca37d89cd14666c3f107463817f4309ba1f2b68 /drivers/usb/host/xhci.h | |
| parent | b6e76371c888f5cb677f190a28444ac8875359ad (diff) | |
usb: xhci: add USB2 Link power management BESL support
usb 2.0 devices with link power managment (LPM) can describe their idle link
timeouts either in BESL or HIRD format, so far xHCI has only supported HIRD but
later xHCI errata add BESL support as well
BESL timeouts need to inform exit latency changes with an evaluate
context command the same way USB 3.0 link PM code does.
The same xhci_change_max_exit_latency() function is used as with USB3
but code is pulled out from #ifdef CONFIG_PM as USB2.0 BESL LPM
funcionality does not depend on CONFIG_PM.
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci.h')
| -rw-r--r-- | drivers/usb/host/xhci.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 01325710424c..c306849eb299 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -386,6 +386,27 @@ struct xhci_op_regs { #define PORT_L1DS(p) (((p) & 0xff) << 8) #define PORT_HLE (1 << 16) + +/* USB2 Protocol PORTHLPMC */ +#define PORT_HIRDM(p)((p) & 3) +#define PORT_L1_TIMEOUT(p)(((p) & 0xff) << 2) +#define PORT_BESLD(p)(((p) & 0xf) << 10) + +/* use 512 microseconds as USB2 LPM L1 default timeout. */ +#define XHCI_L1_TIMEOUT 512 + +/* Set default HIRD/BESL value to 4 (350/400us) for USB2 L1 LPM resume latency. + * Safe to use with mixed HIRD and BESL systems (host and device) and is used + * by other operating systems. + * + * XHCI 1.0 errata 8/14/12 Table 13 notes: + * "Software should choose xHC BESL/BESLD field values that do not violate a + * device's resume latency requirements, + * e.g. not program values > '4' if BLC = '1' and a HIRD device is attached, + * or not program values < '4' if BLC = '0' and a BESL device is attached. + */ +#define XHCI_DEFAULT_BESL 4 + /** * struct xhci_intr_reg - Interrupt Register Set * @irq_pending: IMAN - Interrupt Management Register. Used to enable |