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| author | Dan Williams <dan.j.williams@intel.com> | 2011-11-23 01:41:29 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-11-27 08:11:20 +0400 |
| commit | e86ff4a63c9fdd875ba8492577cd1ad2252f525c (patch) | |
| tree | b29d14f78331c8a2f3287b2451fa891a0d8447de /drivers/tty/serial/8250_pci.c | |
| parent | 448ac154c957c4580531fa0c8f2045816fe2f0e7 (diff) | |
| download | linux-e86ff4a63c9fdd875ba8492577cd1ad2252f525c.tar.xz | |
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>
Diffstat (limited to 'drivers/tty/serial/8250_pci.c')
| -rw-r--r-- | drivers/tty/serial/8250_pci.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250_pci.c b/drivers/tty/serial/8250_pci.c index 8742ef5be6ba..2cbf78f77c4a 100644 --- a/drivers/tty/serial/8250_pci.c +++ b/drivers/tty/serial/8250_pci.c @@ -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 |