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Commit e86ff4a6 authored by Dan Williams's avatar Dan Williams Committed by Greg Kroah-Hartman
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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: default avatarDan Williams <dan.j.williams@intel.com>
Acked-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 448ac154

drivers/tty/serial/8250_pci.c

+14 −0
Original line number Diff line number Diff line
@@ -1118,6 +1118,18 @@ pci_xr17c154_setup(struct serial_private *priv, 
	return pci_default_setup(priv, board, port, idx);

}



static int try_enable_msi(struct pci_dev *dev)

{

	/* use msi if available, but fallback to legacy otherwise */

	pci_enable_msi(dev);

	return 0;

}



static void disable_msi(struct pci_dev *dev)

{

	pci_disable_msi(dev);

}



#define PCI_VENDOR_ID_SBSMODULARIO	0x124B

#define PCI_SUBVENDOR_ID_SBSMODULARIO	0x124B

#define PCI_DEVICE_ID_OCTPRO		0x0001
@@ -1233,7 +1245,9 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = { 
		.device		= PCI_DEVICE_ID_INTEL_PATSBURG_KT,

		.subvendor	= PCI_ANY_ID,

		.subdevice	= PCI_ANY_ID,

		.init		= try_enable_msi,

		.setup		= kt_serial_setup,

		.exit		= disable_msi,

	},

	/*

	 * ITE