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Date:   Tue, 13 Dec 2022 14:10:04 +0000
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Subject: [PATCH v3 2/3] usb: xhci-plat: add xhci_plat_priv_overwrite
From:   Albert Wang <albertccwang@google.com>
To:     mathias.nyman@intel.com, gregkh@linuxfoundation.org
Cc:     badhri@google.com, howardyen@google.com, pumahsu@google.com,
        raychi@google.com, linux-kernel@vger.kernel.org,
        linux-usb@vger.kernel.org
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From: Howard Yen <howardyen@google.com>

Add an overwrite to platform specific callback for setting up the
xhci_offload_ops, allow vendor to store the xhci_offload_ops and
overwrite them when xhci_plat_probe invoked.

Signed-off-by: Howard Yen <howardyen@google.com>
---
 drivers/usb/host/xhci-plat.c | 20 ++++++++++++++++++++
 drivers/usb/host/xhci-plat.h |  7 +++++++
 2 files changed, 27 insertions(+)

diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 2f04acb42fa6..11ff89f722b7 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -173,9 +173,26 @@ static const struct of_device_id usb_xhci_of_match[] = {
 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 #endif
 
+static struct xhci_plat_priv_overwrite xhci_plat_vendor_overwrite;
+
+int xhci_plat_register_offload_ops(struct xhci_offload_ops *offload_ops)
+{
+	if (offload_ops == NULL)
+		return -EINVAL;
+
+	xhci_plat_vendor_overwrite.offload_ops = offload_ops;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xhci_plat_register_offload_ops);
+
 static int xhci_vendor_init(struct xhci_hcd *xhci)
 {
 	struct xhci_offload_ops *ops = xhci_offload_get_ops(xhci);
+	struct xhci_plat_priv *priv = xhci_to_priv(xhci);
+
+	if (xhci_plat_vendor_overwrite.offload_ops)
+		ops = priv->offload_ops = xhci_plat_vendor_overwrite.offload_ops;
 
 	if (ops && ops->offload_init)
 		return ops->offload_init(xhci);
@@ -185,9 +202,12 @@ static int xhci_vendor_init(struct xhci_hcd *xhci)
 static void xhci_vendor_cleanup(struct xhci_hcd *xhci)
 {
 	struct xhci_offload_ops *ops = xhci_offload_get_ops(xhci);
+	struct xhci_plat_priv *priv = xhci_to_priv(xhci);
 
 	if (ops && ops->offload_cleanup)
 		ops->offload_cleanup(xhci);
+
+	priv->offload_ops = NULL;
 }
 
 static int xhci_plat_probe(struct platform_device *pdev)
diff --git a/drivers/usb/host/xhci-plat.h b/drivers/usb/host/xhci-plat.h
index 5aa0d38fa01a..0656d6daa194 100644
--- a/drivers/usb/host/xhci-plat.h
+++ b/drivers/usb/host/xhci-plat.h
@@ -22,4 +22,11 @@ struct xhci_plat_priv {
 
 #define hcd_to_xhci_priv(h) ((struct xhci_plat_priv *)hcd_to_xhci(h)->priv)
 #define xhci_to_priv(x) ((struct xhci_plat_priv *)(x)->priv)
+
+struct xhci_plat_priv_overwrite {
+	struct xhci_offload_ops *offload_ops;
+};
+
+int xhci_plat_register_offload_ops(struct xhci_offload_ops *offload_ops);
+
 #endif	/* _XHCI_PLAT_H */
-- 
2.39.0.rc1.256.g54fd8350bd-goog