diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2012-04-06 11:49:50 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-04-22 15:38:57 -0700 |
| commit | db3c56d76ac8c7eee6c2652e056f326c699e8ce9 (patch) | |
| tree | 685399105f7879c76f66ba1b4fe4166a411fc4cb /include | |
| parent | 450fb07050462a1b3839a7b8d301c34cc6882461 (diff) | |
serial/8250_pci: add a "force background timer" flag and use it for the "kt" serial port
commit bc02d15a3452fdf9276e8fb89c5e504a88df888a upstream.
Workaround dropped notifications in the iir register. Register reads
coincident with new interrupt notifications sometimes result in this
device clearing the interrupt event without reporting it in the read
data.
The serial core already has a heuristic for determining when a device
has an untrustworthy iir register. In this case when we apriori know
that the iir is faulty use a flag (UPF_BUG_THRE) to bypass the test and
force usage of the background timer.
Acked-by: Alan Cox <alan@linux.intel.com>
Reported-by: Nhan H Mai <nhan.h.mai@intel.com>
Reported-by: Sudhakar Mamillapalli <sudhakar@fb.com>
Tested-by: Nhan H Mai <nhan.h.mai@intel.com>
Tested-by: Sudhakar Mamillapalli <sudhakar@fb.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/serial_core.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h index c56d114254b9..cbb3d12a6770 100644 --- a/include/linux/serial_core.h +++ b/include/linux/serial_core.h @@ -355,6 +355,7 @@ struct uart_port { #define UPF_CONS_FLOW ((__force upf_t) (1 << 23)) #define UPF_SHARE_IRQ ((__force upf_t) (1 << 24)) #define UPF_EXAR_EFR ((__force upf_t) (1 << 25)) +#define UPF_BUG_THRE ((__force upf_t) (1 << 26)) /* The exact UART type is known and should not be probed. */ #define UPF_FIXED_TYPE ((__force upf_t) (1 << 27)) #define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28)) |