AuxXxilium/linux_dsm_epyc7002
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USB: xhci: fix OS want to own HC

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Software should set XHCI_HC_OS_OWNED bit to request ownership of xHC.

This patch should be backported to kernels as far back as 2.6.31.

Signed-off-by: JiSheng Zhang <jszhang3@gmail.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org
This commit is contained in:
JiSheng Zhang 2011-07-16 11:04:19 +08:00 committed by Sarah Sharp
parent 7bd89b4017
commit 6768458b17
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/host/pci-quirks.c
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@ -817,7 +817,7 @@ static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
/* If the BIOS owns the HC, signal that the OS wants it, and wait */
if (val & XHCI_HC_BIOS_OWNED) {
writel(val & XHCI_HC_OS_OWNED, base + ext_cap_offset);
writel(val | XHCI_HC_OS_OWNED, base + ext_cap_offset);
/* Wait for 5 seconds with 10 microsecond polling interval */
timeout = handshake(base + ext_cap_offset, XHCI_HC_BIOS_OWNED,