From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Alan Stern <stern@rowland.harvard.edu>,
Longfang Liu <liulongfang@huawei.com>
Subject: [PATCH 4.19 08/11] USB:ehci:fix Kunpeng920 ehci hardware problem
Date: Fri, 13 Aug 2021 17:07:15 +0200 [thread overview]
Message-ID: <20210813150520.340771651@linuxfoundation.org> (raw)
In-Reply-To: <20210813150520.072304554@linuxfoundation.org>
From: Longfang Liu <liulongfang@huawei.com>
commit 26b75952ca0b8b4b3050adb9582c8e2f44d49687 upstream.
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 skip
the read operation of the SBRN register.
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Link: https://lore.kernel.org/r/1617958081-17999-1-git-send-email-liulongfang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/host/ehci-pci.c | 3 +++
1 file changed, 3 insertions(+)
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -298,6 +298,9 @@ static int ehci_pci_setup(struct usb_hcd
if (pdev->vendor == PCI_VENDOR_ID_STMICRO
&& pdev->device == PCI_DEVICE_ID_STMICRO_USB_HOST)
; /* ConneXT has no sbrn register */
+ else if (pdev->vendor == PCI_VENDOR_ID_HUAWEI
+ && pdev->device == 0xa239)
+ ; /* HUAWEI Kunpeng920 USB EHCI has no sbrn register */
else
pci_read_config_byte(pdev, 0x60, &ehci->sbrn);
next prev parent reply other threads:[~2021-08-13 15:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 15:07 [PATCH 4.19 00/11] 4.19.204-rc1 review Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 01/11] KVM: SVM: Fix off-by-one indexing when nullifying last used SEV VMCB Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 02/11] tracing: Reject string operand in the histogram expression Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 03/11] bpf: Inherit expanded/patched seen count from old aux data Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 04/11] bpf: Do not mark insn as seen under speculative path verification Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 05/11] bpf: Fix leakage under speculation on mispredicted branches Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 06/11] bpf, selftests: Adjust few selftest outcomes wrt unreachable code Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 07/11] KVM: X86: MMU: Use the correct inherited permissions to get shadow page Greg Kroah-Hartman
2021-08-13 15:07 ` Greg Kroah-Hartman [this message]
2021-08-13 15:07 ` [PATCH 4.19 09/11] ppp: Fix generating ppp unit id when ifname is not specified Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 10/11] ovl: prevent private clone if bind mount is not allowed Greg Kroah-Hartman
2021-08-13 15:07 ` [PATCH 4.19 11/11] net: xilinx_emaclite: Do not print real IOMEM pointer Greg Kroah-Hartman
2021-08-13 23:25 ` [PATCH 4.19 00/11] 4.19.204-rc1 review Shuah Khan
2021-08-14 11:09 ` Sudip Mukherjee
2021-08-14 11:42 ` Naresh Kamboju
2021-08-14 18:15 ` Guenter Roeck
2021-08-15 19:50 ` Pavel Machek
2021-08-16 3:09 ` Samuel Zou
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