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Commit 3d0b6087 authored by Major Lee's avatar Major Lee Committed by Linus Torvalds
Browse files

dw_spi: Fix missing final read in some polling situations 



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.

Verified on SPI touch screen device.

Signed-off-by: default avatarMajor Lee <major_lee@wistron.com>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 54efdfeb

drivers/spi/dw_spi.c

+5 −0
Original line number Diff line number Diff line
@@ -413,6 +413,11 @@ 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);



	transfer_complete(dws);

}