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serial/8250_pci: init-quirk msi support for kt serial controller
The semantics of UPF_IIR_ONCE (once per serial irq) are only guaranteed if the kt irq is not shared (once per serial isr in the shared case == potentially unwanted reads of the IIR). Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -1118,6 +1118,18 @@ pci_xr17c154_setup(struct serial_private *priv,
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return pci_default_setup(priv, board, port, idx);
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}
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static int try_enable_msi(struct pci_dev *dev)
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{
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/* use msi if available, but fallback to legacy otherwise */
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pci_enable_msi(dev);
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return 0;
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}
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static void disable_msi(struct pci_dev *dev)
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{
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pci_disable_msi(dev);
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}
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#define PCI_VENDOR_ID_SBSMODULARIO 0x124B
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#define PCI_SUBVENDOR_ID_SBSMODULARIO 0x124B
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#define PCI_DEVICE_ID_OCTPRO 0x0001
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@ -1233,7 +1245,9 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
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.device = PCI_DEVICE_ID_INTEL_PATSBURG_KT,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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.init = try_enable_msi,
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.setup = kt_serial_setup,
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.exit = disable_msi,
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},
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/*
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* ITE
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