evie/android_kernel_oneplus_msm8998
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

usb: hub: delay hub autosuspend if USB3 port is still link training

Browse source 
[ Upstream commit e86108940e541febf35813402ff29fa6f4a9ac0b ]

When initializing a hub we want to give a USB3 port in link training
the same debounce delay time before autosuspening the hub as already
trained, connected enabled ports.

USB3 ports won't reach the enabled state with "current connect status" and
"connect status change" bits set until the USB3 link training finishes.

Catching the port in link training (polling) and adding the debounce delay
prevents unnecessary failed attempts to autosuspend the hub.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mathias Nyman 2018-11-28 15:55:21 +02:00 • committed by Greg Kroah-Hartman
parent 7518fa7dc1
commit 235f1e5e12
1 changed files with 10 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/usb/core/hub.c
View file

@ -1092,6 +1092,16 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
USB_PORT_FEAT_ENABLE);
}
/*
* Add debounce if USB3 link is in polling/link training state.
* Link will automatically transition to Enabled state after
* link training completes.
*/
if (hub_is_superspeed(hdev) &&
((portstatus & USB_PORT_STAT_LINK_STATE) ==
USB_SS_PORT_LS_POLLING))
need_debounce_delay = true;
/* Clear status-change flags; we'll debounce later */
if (portchange & USB_PORT_STAT_C_CONNECTION) {
need_debounce_delay = true;