There is a possible that lost the last word of a transaction if data is not ready. Read again in poll_transfer() to solve this issue when poll_mode is enabled.
Patch is against mainline (2.6.37-rc5). Verified on SPI touch screen device. Signed-off-by: Major Lee <[email protected]> --- dw_spi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff -uprN a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c --- a/drivers/spi/dw_spi.c 2010-12-07 01:21:54.000000000 +0800 +++ b/drivers/spi/dw_spi.c 2010-12-10 10:17:45.997972000 +0800 @@ -419,6 +419,12 @@ static void poll_transfer(struct dw_spi { while (dws->write(dws)) dws->read(dws); + /* + * There is a possible that lost the last word + * of a transaction if data is not ready. + * Read again to solve this issue. + */ + dws->read(dws); dw_spi_xfer_done(dws); } _______________________________________________ MeeGo-kernel mailing list [email protected] http://lists.meego.com/listinfo/meego-kernel
