AuxXxilium/linux_dsm_epyc7002
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25cd2882e2
linux_dsm_epyc7002/drivers/usb/core
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Sarah Sharp 25cd2882e2 usb/xhci: Change how we indicate a host supports Link PM. 
The xHCI driver currently uses a USB core internal field,
udev->lpm_capable, to indicate the xHCI driver knows how to calculate
the LPM timeout values.  If this value is set for the host controller
udev, it means Link PM can be enabled for child devices under that host.

Change the code so the xHCI driver isn't mucking with USB core internal
fields.  Instead, indicate the xHCI driver doesn't support Link PM on
this host by clearing the U1 and U2 exit latencies in the roothub
SuperSpeed Extended Capabilities BOS descriptor.

The code to check for the roothub setting U1 and U2 exit latencies to
zero will also disable LPM for external devices that do that same.  This
was already effectively done with commit
ae8963adb4 "usb: Don't enable LPM if the
exit latency is zero."  Leave that code in place, so that if a device
sets one exit latency value to zero, but the other is set to a valid
value, LPM is only enabled for the U1 or U2 state that had the valid
value.  This is the same behavior the code had before.

Also, change messages about missing Link PM information from warning
level to info level.  Only print a warning about the first device that
doesn't support LPM, to avoid log spam.  Further, cleanup some
unnecessary line breaks to help people to grep for the error messages.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
2014-03-04 15:38:00 -08:00
..
buffer.c USB: core: correct spelling mistakes in comments and warning 2014-01-07 16:17:40 -08:00
config.c usb: delete non-required instances of include <linux/init.h> 2014-01-08 15:01:39 -08:00
devices.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-02-26 20:16:07 -08:00
devio.c USB: complain if userspace resets an active endpoint 2014-02-24 17:07:53 -08:00
driver.c Merge 3.14-rc3 into usb-next 2014-02-18 09:27:12 -08:00
endpoint.c USB: core: be specific about attribute permissions 2013-08-25 15:12:03 -07:00
file.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2013-11-13 15:34:18 +09:00
generic.c USB: avoid error messages when a device is disconnected 2013-03-28 11:05:52 -07:00
hcd-pci.c usb: hcd: move controller wakeup setting initialization to individual driver 2013-12-08 18:06:46 -08:00
hcd.c Revert "usbcore: set lpm_capable field for LPM capable root hubs" 2014-01-22 13:59:35 -08:00
hub.c usb/xhci: Change how we indicate a host supports Link PM. 2014-03-04 15:38:00 -08:00
hub.h USB: core: correct spelling mistakes in comments and warning 2014-01-07 16:17:40 -08:00
Kconfig treewide: Fix typo in Kconfig 2013-10-14 15:23:02 +02:00
Makefile USB: core: remove CONFIG_USB_DEBUG usage 2013-12-21 16:01:00 -08:00
message.c usb: delete non-required instances of include <linux/init.h> 2014-01-08 15:01:39 -08:00
notify.c
otg_whitelist.h
port.c USB: core: be specific about attribute permissions 2013-08-25 15:12:03 -07:00
quirks.c Revert "USB: quirks: add touchscreen that is dazzeled by remote wakeup" 2013-12-08 18:07:38 -08:00
sysfs.c USB: core: correct spelling mistakes in comments and warning 2014-01-07 16:17:40 -08:00
urb.c usb: delete non-required instances of include <linux/init.h> 2014-01-08 15:01:39 -08:00
usb-acpi.c ACPI and power management updates for 3.14-rc1 2014-01-24 15:51:02 -08:00
usb.c drivers: usb: core: {file,hub,sysfs,usb}.c: Whitespace fixes 2013-10-11 17:02:37 -07:00
usb.h Revert "usbcore: set lpm_capable field for LPM capable root hubs" 2014-01-22 13:59:35 -08:00