From: Major Lee <[email protected]> There is a possibility that the last word of a transaction will be lost if data is not ready. Re-read 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]> Signed-off-by: Alan Cox <[email protected]> --- drivers/spi/dw_spi.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/spi/dw_spi.c b/drivers/spi/dw_spi.c index 9c1d07b..497ecb3 100644 --- a/drivers/spi/dw_spi.c +++ b/drivers/spi/dw_spi.c @@ -419,6 +419,11 @@ static void poll_transfer(struct dw_spi *dws) { while (dws->write(dws)) dws->read(dws); + /* + * There is a possibility that the last word of a transaction + * will be lost if data is not ready. Re-read to solve this issue. + */ + dws->read(dws); dw_spi_xfer_done(dws); } ------------------------------------------------------------------------------ _______________________________________________ spi-devel-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/spi-devel-general
