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usb: core: reduce power-on-good delay time of root hub 

Return the exactly delay time given by root hub descriptor,
this helps to reduce resume time etc.

Due to the root hub descriptor is usually provided by the host
controller driver, if there is compatibility for a root hub,
we can fix it easily without affect other root hub

Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/1618017645-12259-1-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chunfeng Yun 2021-04-10 09:20:45 +08:00 committed by Greg Kroah-Hartman
parent 26b75952ca
commit 90d28fb53d
1 changed files with 4 additions and 2 deletions
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6
drivers/usb/core/hub.h
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@ -148,8 +148,10 @@ static inline unsigned hub_power_on_good_delay(struct usb_hub *hub)
{
unsigned delay = hub->descriptor->bPwrOn2PwrGood * 2;
/* Wait at least 100 msec for power to become stable */
return max(delay, 100U);
if (!hub->hdev->parent) /* root hub */
return delay;
else /* Wait at least 100 msec for power to become stable */
return max(delay, 100U);
}
static inline int hub_port_debounce_be_connected(struct usb_hub *hub,