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USB: ehci: reopen solution for Synopsys HC bug 

A Synopsys USB2.0 core used in Huawei Kunpeng920 SoC has a bug which
might cause the host controller not issuing ping.

Bug description:
After indicating an Interrupt on Async Advance, the software uses the
doorbell mechanism to delete the Next Link queue head of the last
executed queue head. At this time, the host controller still references
the removed queue head(the queue head is NULL). NULL reference causes
the host controller to lose the USB device.

Solution:
After deleting the Next Link queue head, when has_synopsys_hc_bug set
to 1，the software can write one of the valid queue head addresses to
the ASYNCLISTADDR register to allow the host controller to get
the valid queue head. in order to solve that problem, this patch set
the flag for Huawei Kunpeng920

There are detailed instructions and solutions in this patch:
commit 2f7ac6c199 ("USB: ehci: add workaround for Synopsys HC bug")

Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/1591588019-44284-1-git-send-email-liulongfang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
alistair/sunxi64-5.8
Longfang Liu 2020-06-08 11:46:59 +08:00 committed by Greg Kroah-Hartman
parent 28ebeb8db7
commit 1ddcb71a3e
1 changed files with 7 additions and 0 deletions
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7
drivers/usb/host/ehci-pci.c
View File

@ -216,6 +216,13 @@ static int ehci_pci_setup(struct usb_hcd *hcd)
ehci_info(ehci, "applying MosChip frame-index workaround\n");
ehci->frame_index_bug = 1;
break;
case PCI_VENDOR_ID_HUAWEI:
/* Synopsys HC bug */
if (pdev->device == 0xa239) {
ehci_info(ehci, "applying Synopsys HC workaround\n");
ehci->has_synopsys_hc_bug = 1;
}
break;
}
/* optional debug port, normally in the first BAR */