linux-kernel - [PATCH v3 3/4] usb: host: add some to xhci overrides for USB offload

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Date:   Mon, 21 Mar 2022 17:59:53 +0900
From:   Daehwan Jung <dh10.jung@...sung.com>
To:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-usb@...r.kernel.org (open list:USB XHCI DRIVER),
        linux-kernel@...r.kernel.org (open list),
        Howard Yen <howardyen@...gle.com>,
        Jack Pham <jackp@...eaurora.org>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>,
        Daehwan Jung <dh10.jung@...sung.com>, sc.suh@...sung.com
Subject: [PATCH v3 3/4] usb: host: add some to xhci overrides for USB
 offload

Co-processor needs some information about connected usb device.
It's proper to pass information after usb device gets address when
getting "Set Address" command. It supports vendors to implement it
using xhci overrides. There're several power scenarios depending
on vendors. It gives vendors flexibilty to meet their power requirement.
They can override suspend and resume of root hub.

Signed-off-by: Daehwan Jung <dh10.jung@...sung.com>
---
 drivers/usb/host/xhci.c | 6 ++++++
 drivers/usb/host/xhci.h | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 4e4fcf97ba42..d3c3d57c89f9 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -5544,6 +5544,12 @@ void xhci_init_driver(struct hc_driver *drv,
 			drv->check_bandwidth = over->check_bandwidth;
 		if (over->reset_bandwidth)
 			drv->reset_bandwidth = over->reset_bandwidth;
+		if (over->address_device)
+			drv->address_device = over->address_device;
+		if (over->bus_suspend)
+			drv->bus_suspend = over->bus_suspend;
+		if (over->bus_resume)
+			drv->bus_resume = over->bus_resume;
 	}
 }
 EXPORT_SYMBOL_GPL(xhci_init_driver);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index f690a5dc9eb3..de37d72847f2 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1947,6 +1947,9 @@ struct xhci_driver_overrides {
 			     struct usb_host_endpoint *ep);
 	int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
 	void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
+	int (*address_device)(struct usb_hcd *hcd, struct usb_device *udev);
+	int (*bus_suspend)(struct usb_hcd *hcd);
+	int (*bus_resume)(struct usb_hcd *hcd);
 };
 
 #define	XHCI_CFC_DELAY		10
@@ -2103,6 +2106,7 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
 		       struct usb_host_endpoint *ep);
 int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
 void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev);
+int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev);
 int xhci_disable_slot(struct xhci_hcd *xhci, u32 slot_id);
 int xhci_ext_cap_init(struct xhci_hcd *xhci);
 
-- 
2.31.1