tree 0cc7c1c45d2b1502874bd77f83a51c961959efdc
parent 60d852e1aa0985f92ecf38fdc449166bfcf9ab6c
author Peter Hess <peter.hess@ph-home.de> 1625573769 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1627456467 +0200

spi: mediatek: fix fifo rx mode

[ Upstream commit 3a70dd2d050331ee4cf5ad9d5c0a32d83ead9a43 ]

In FIFO mode were two problems:
- RX mode was never handled and
- in this case the tx_buf pointer was NULL and caused an exception

fix this by handling RX mode in mtk_spi_fifo_transfer

Fixes: a568231f4632 ("spi: mediatek: Add spi bus for Mediatek MT8173")
Signed-off-by: Peter Hess <peter.hess@ph-home.de>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20210706121609.680534-1-linux@fw-web.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>