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From: Longfang Liu <liulongfang@huawei.com>
To: <gregkh@linuxfoundation.org>, <mathias.nyman@intel.com>,
	<stern@rowland.harvard.edu>, <liudongdong3@huawei.com>
Cc: <linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<liulongfang@huawei.com>, <kong.kongxinwei@hisilicon.com>,
	<yisen.zhuang@huawei.com>
Subject: [PATCH v2 2/2] USB:ehci:fix Kunpeng920 ehci hardware problem
Date: Thu, 8 Apr 2021 21:49:20 +0800
Message-ID: <1617889760-17733-3-git-send-email-liulongfang@huawei.com> (raw)
In-Reply-To: <1617889760-17733-1-git-send-email-liulongfang@huawei.com>

Kunpeng920's EHCI controller does not have SBRN register.
Reading the SBRN register when the controller driver is
initialized will get 0.

When rebooting the EHCI driver, ehci_shutdown() will be called.
if the sbrn flag is 0, ehci_shutdown() will return directly.
The sbrn flag being 0 will cause the EHCI interrupt signal to
not be turned off after reboot. this interrupt that is not closed
will cause an exception to the device sharing the interrupt.

Therefore, the EHCI controller of kunpeng920 needs to be added
to the whitelist without SBRN register.

Signed-off-by: Longfang Liu <liulongfang@huawei.com>
---
 drivers/usb/host/ehci-pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 534e906..7bd075c 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -53,6 +53,8 @@ static const struct usb_nosbrn_whitelist_entry {
 } usb_nosbrn_whitelist[] = {
 	/* STMICRO ConneXT has no sbrn register */
 	{PCI_VENDOR_ID_STMICRO, PCI_DEVICE_ID_STMICRO_USB_HOST},
+	/* HUAWEI Kunpeng920 HiSilicon USB EHCI has no sbrn register */
+	{PCI_VENDOR_ID_HUAWEI, 0xa239},
 	/* End of list */
 	{NULL, NULL}
 };
-- 
2.8.1


  parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-08 13:49 [PATCH v2 0/2] USB:ehci:fix the no SRBN register problem Longfang Liu
2021-04-08 13:49 ` [PATCH v2 1/2] USB:ehci:Add a whitelist for EHCI controllers Longfang Liu
2021-04-08 14:53   ` Greg KH
2021-04-08 17:30   ` kernel test robot
2021-04-08 20:34   ` kernel test robot
2021-04-08 13:49 ` Longfang Liu [this message]
2021-04-08 14:53 ` [PATCH v2 0/2] USB:ehci:fix the no SRBN register problem Alan Stern
2021-04-09  2:42   ` liulongfang
2021-04-09  6:47     ` Greg KH

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