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
References: bsc#1012628
Patch-mainline: 6.3.4
Git-commit: dddb342b5b9e482bb213aecc08cbdb201ea4f8da
commit dddb342b5b9e482bb213aecc08cbdb201ea4f8da upstream.
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>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
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 3592f757..7bd2fddd 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