From dddb342b5b9e482bb213aecc08cbdb201ea4f8da Mon Sep 17 00:00:00 2001
From: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
Date: Sun, 23 Apr 2023 18:59:52 +0800
Subject: [PATCH] USB: UHCI: adjust zhaoxin UHCI controllers OverCurrent bit value
Git-commit: dddb342b5b9e482bb213aecc08cbdb201ea4f8da
Patch-mainline: v6.4-rc3
References: git-fixes

OverCurrent condition is not standardized in the UHCI spec.
Zhaoxin UHCI controllers report OverCurrent bit active off.
In order to handle OverCurrent condition correctly, the uhci-hcd
driver needs to be told to expect the active-off behavior.

Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Weitao Wang <WeitaoWang-oc@zhaoxin.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20230423105952.4526-1-WeitaoWang-oc@zhaoxin.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/usb/host/uhci-pci.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/uhci-pci.c b/drivers/usb/host/uhci-pci.c
index 3592f757fe05..7bd2fddde770 100644
--- a/drivers/usb/host/uhci-pci.c
+++ b/drivers/usb/host/uhci-pci.c
@@ -119,11 +119,13 @@ static int uhci_pci_init(struct usb_hcd *hcd)
 
 	uhci->rh_numports = uhci_count_ports(hcd);
 
-	/* Intel controllers report the OverCurrent bit active on.
-	 * VIA controllers report it active off, so we'll adjust the
-	 * bit value.  (It's not standardized in the UHCI spec.)
+	/*
+	 * Intel controllers report the OverCurrent bit active on.  VIA
+	 * and ZHAOXIN controllers report it active off, so we'll adjust
+	 * the bit value.  (It's not standardized in the UHCI spec.)
 	 */
-	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA)
+	if (to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_VIA ||
+			to_pci_dev(uhci_dev(uhci))->vendor == PCI_VENDOR_ID_ZHAOXIN)
 		uhci->oc_low = 1;
 
 	/* HP's server management chip requires a longer port reset delay. */
-- 
2.35.3