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- From b5c498026a95f9d80be23711dd6c178cc78d6c33 Mon Sep 17 00:00:00 2001
- From: Peter Chen <[email protected]>
- Date: Wed, 15 Aug 2018 14:59:55 +0800
- Subject: [PATCH] MLK-18794-1 usb: host: xhci: add .bus_suspend override
- Some platforms (eg: Cadence USB3) have special requirements to add
- platform USB register setting between xhci_bus_suspend and
- platform USB controller suspend routine. Eg, The Cadence USB3 needs
- RX detect clock switch from 24Mhz to 32Khz within 100ms after set
- port to U3, but sometimes, for USB3 HUB connection, the USB2
- bus suspend will cost more than 100ms, and introduce the disconnection
- before the PHY enters low power mode, then the state is in mess from
- controller side.
- So in this commit, we introduce .bus_suspend for xhci_driver_overrides
- for above use cases.
- Signed-off-by: Peter Chen <[email protected]>
- (cherry picked from commit f6baa57913ceb40da14a945820cb87e8d6ceb7c7)
- ---
- drivers/usb/host/xhci.c | 2 ++
- drivers/usb/host/xhci.h | 1 +
- 2 files changed, 3 insertions(+)
- --- a/drivers/usb/host/xhci.c
- +++ b/drivers/usb/host/xhci.c
- @@ -5405,6 +5405,8 @@ void xhci_init_driver(struct hc_driver *
- drv->check_bandwidth = over->check_bandwidth;
- if (over->reset_bandwidth)
- drv->reset_bandwidth = over->reset_bandwidth;
- + if (over->bus_suspend)
- + drv->bus_suspend = over->bus_suspend;
- }
- }
- EXPORT_SYMBOL_GPL(xhci_init_driver);
- --- a/drivers/usb/host/xhci.h
- +++ b/drivers/usb/host/xhci.h
- @@ -1916,6 +1916,7 @@ struct xhci_driver_overrides {
- int (*start)(struct usb_hcd *hcd);
- int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
- void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
- + int (*bus_suspend)(struct usb_hcd *hcd);
- };
-
- #define XHCI_CFC_DELAY 10
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