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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>
This commit is contained in:
Dan Williams 2011-11-22 13:41:29 -08:00 committed by Greg Kroah-Hartman
parent 448ac154c9
commit e86ff4a63c
1 changed files with 14 additions and 0 deletions
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14
drivers/tty/serial/8250_pci.c
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@ -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