usb: host: add has_tdi_phy_lpm capability bit
authorTuomas Tynkkynen <ttynkkynen@nvidia.com>
Mon, 12 Aug 2013 13:06:49 +0000 (16:06 +0300)
committerFelipe Balbi <balbi@ti.com>
Mon, 12 Aug 2013 18:29:46 +0000 (13:29 -0500)
commit2cdcec4fedd6a5ee77bd551e6be7505f2230cd43
treeaad4d77dbfcfd247ee4f6926904895fdec13e35c
parent23381db7cedc26f87a37746ccf7c658d977e467e
usb: host: add has_tdi_phy_lpm capability bit

The has_hostpc capability bit indicates that the host controller has the
HOSTPC register extensions, but at the same time enables clock disabling
power saving features with the PHY Low Power Clock Disable (PHCD) bit.

However, some host controllers have the HOSTPC extensions but don't
support the low-power feature, so the PHCD bit must not be set on those
controllers. Add a separate capability bit for the low-power feature
instead, and change all existing users of has_hostpc to use this new
capability bit.

The idea for this commit is taken from an old 2012 commit that never got
merged ("disociate chipidea PHY low power suspend control from hostpc")

Inspired-by: Matthieu CASTET <matthieu.castet@parrot.com>
Signed-off-by: Tuomas Tynkkynen <ttynkkynen@nvidia.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Stephen Warren <swarren@nvidia.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
drivers/usb/chipidea/host.c
drivers/usb/host/ehci-hub.c
drivers/usb/host/ehci.h