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| author | chao bi <chao.bi@intel.com> | 2012-10-31 16:54:07 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-11-01 08:50:01 -0700 |
| commit | 31fe99048859b13a87f476016e7bb5c2b5220c36 (patch) | |
| tree | 425b1ce34168d16470530f21b87f92b1ec077093 /drivers/tty/serial/ifx6x60.h | |
| parent | 2ac4ad2a1468123f6bb439a547880a9c0d302e0a (diff) | |
| download | blackbird-op-linux-31fe99048859b13a87f476016e7bb5c2b5220c36.tar.gz blackbird-op-linux-31fe99048859b13a87f476016e7bb5c2b5220c36.zip | |
serial:ifx6x60:Prevent data transfer when IFX6x60 port is shutdown
This patch is to implement following 2 places to avoid potential error when IFX6x60 port shutdown:
1) Clear Flag IFX_SPI_STATE_IO_AVAILABLE to disable data transfer when Modem port is shutdown;
2) Clear Flag IFX_SPI_STATE_IO_IN_PROGRESS and IFX_SPI_STATE_IO_READY when reopen port.
This is because last port shutdown may happen when SPI/DMA transfer is in progress, if the last
data transfer is not completed(for example due to modem reset), the Flag IFX_SPI_STATE_IO_IN_PROGRESS
will be set forever, so when IFX port is activated again, IFX_SPI_STATE_IO_IN_PROGRESS will prevent
transferring data forever. And if don't clear IFX_SPI_STATE_IO_READY, it may cause one more SPI frame
transferring in spit there is not data need to be transfer.
cc: liu chuansheng <chuansheng.liu@intel.com>
cc: Chen Jun <jun.d.chen@intel.com>
Signed-off-by: channing <chao.bi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/ifx6x60.h')
| -rw-r--r-- | drivers/tty/serial/ifx6x60.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/tty/serial/ifx6x60.h b/drivers/tty/serial/ifx6x60.h index d8869f5a4632..4fbddc297839 100644 --- a/drivers/tty/serial/ifx6x60.h +++ b/drivers/tty/serial/ifx6x60.h @@ -41,6 +41,7 @@ #define IFX_SPI_STATE_IO_IN_PROGRESS 1 #define IFX_SPI_STATE_IO_READY 2 #define IFX_SPI_STATE_TIMER_PENDING 3 +#define IFX_SPI_STATE_IO_AVAILABLE 4 /* flow control bitfields */ #define IFX_SPI_DCD 0 |
