A Synopsys USB2.0 core used in Huawei Kunpeng920 SoC has a bug which might cause the host controller not issuing ping. The detailed description and solution: Link: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/commit/?id=2f7ac6c199978d0a0e407a12534201aa675a6482 Signed-off-by: Longfang Liu <liulongfang@xxxxxxxxxx> Reviewed-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx> --- drivers/usb/host/ehci-pci.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c index 1a48ab1..7ff2cbd 100644 --- a/drivers/usb/host/ehci-pci.c +++ b/drivers/usb/host/ehci-pci.c @@ -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 */ -- 2.8.1
