linux-kernel - [PATCH v5 4/6] usb: host: add some to xhci overrides for xhci-exynos

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Date:   Fri,  6 May 2022 15:31:17 +0900
From:   Daehwan Jung <dh10.jung@...sung.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Tony Lindgren <tony@...mide.com>,
        Juergen Gross <jgross@...e.com>, Arnd Bergmann <arnd@...db.de>,
        Matthias Kaehlcke <mka@...omium.org>
Cc:     linux-kernel@...r.kernel.org (open list),
        linux-usb@...r.kernel.org (open list:DESIGNWARE USB3 DRD IP DRIVER),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/SAMSUNG S3C,
        S5P AND EXYNOS ARM ARCHITECTURES),
        linux-samsung-soc@...r.kernel.org (open list:ARM/SAMSUNG S3C, S5P AND
        EXYNOS ARM ARCHITECTURES), sc.suh@...sung.com,
        taehyun.cho@...sung.com, jh0801.jung@...sung.com,
        eomji.oh@...sung.com, Daehwan Jung <dh10.jung@...sung.com>
Subject: [PATCH v5 4/6] usb: host: add some to xhci overrides for
 xhci-exynos

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 | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 5ccf1bbe8732..8b3df1302650 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -5555,6 +5555,12 @@ 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 5d356f40c2b9..ab74b24a13b3 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
-- 
2.31.1