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| author | Steven A. Falco <sfalco@harris.com> | 2013-04-22 09:34:39 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-05-07 19:57:24 -0700 |
| commit | 9702319c6eb4ebedc334ea5825ccce3b210c4a32 (patch) | |
| tree | 341bda190d1bd216221827bf9586cc597e7b145e /arch | |
| parent | 08181f491cd016e610d072dd42e8d0e7bda4a789 (diff) | |
| download | lwn-9702319c6eb4ebedc334ea5825ccce3b210c4a32.tar.gz lwn-9702319c6eb4ebedc334ea5825ccce3b210c4a32.zip | |
i2c: xiic: must always write 16-bit words to TX_FIFO
commit c39e8e4354ce4daf23336de5daa28a3b01f00aa6 upstream.
The TX_FIFO register is 10 bits wide. The lower 8 bits are the data to be
written, while the upper two bits are flags to indicate stop/start.
The driver apparently attempted to optimize write access, by only writing a
byte in those cases where the stop/start bits are zero. However, we have
seen cases where the lower byte is duplicated onto the upper byte by the
hardware, which causes inadvertent stop/starts.
This patch changes the write access to the transmit FIFO to always be 16 bits
wide.
Signed off by: Steven A. Falco <sfalco@harris.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions