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authorSowjanya Komatineni <skomatineni@nvidia.com>2020-12-21 13:17:35 -0800
committerMark Brown <broonie@kernel.org>2021-01-06 13:09:31 +0000
commit98621ed011c57ba6e52e01a5982b221c9943b6d9 (patch)
tree505e60214ccdf5bd51918cf52730416bee2de05f /drivers/spi/spi-mem.c
parent921fc1838fb036f690b8ba52e6a6d3644b475cbb (diff)
downloadlwn-98621ed011c57ba6e52e01a5982b221c9943b6d9.tar.gz
lwn-98621ed011c57ba6e52e01a5982b221c9943b6d9.zip
spi: spi-mem: Mark dummy transfers by setting dummy_data bit
This patch marks dummy transfer by setting dummy_data bit to 1. Controllers supporting dummy transfer by hardware use this bit field to skip software transfer of dummy bytes and use hardware dummy bytes transfer. Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com> Link: https://lore.kernel.org/r/1608585459-17250-6-git-send-email-skomatineni@nvidia.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-mem.c')
-rw-r--r--drivers/spi/spi-mem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c
index f3a3f196e628..c64371ce6c38 100644
--- a/drivers/spi/spi-mem.c
+++ b/drivers/spi/spi-mem.c
@@ -354,6 +354,7 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
xfers[xferpos].tx_buf = tmpbuf + op->addr.nbytes + 1;
xfers[xferpos].len = op->dummy.nbytes;
xfers[xferpos].tx_nbits = op->dummy.buswidth;
+ xfers[xferpos].dummy_data = 1;
spi_message_add_tail(&xfers[xferpos], &msg);
xferpos++;
totalxferlen += op->dummy.nbytes;