spi: dw: Fix Designware SPI loopback

[ Upstream commit 1403cfa69d310781f9548951c97725c67ffcf613 ]

The SPI_LOOP is set in spi->mode but not propagated to the register.
A previous patch removed the bit during a cleanup.

Fixes: e1bc204894ea ("spi: dw: fix potential variable assignment error")
Signed-off-by: Thor Thayer <thor.thayer@linux.intel.com>
Link: https://lore.kernel.org/r/1572985330-5525-1-git-send-email-thor.thayer@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 9a49e07..076652d 100644 (file)
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -308,7 +308,8 @@ static int dw_spi_transfer_one(struct spi_controller *master,
        cr0 = (transfer->bits_per_word - 1)
                | (chip->type << SPI_FRF_OFFSET)
                | ((((spi->mode & SPI_CPOL) ? 1 : 0) << SPI_SCOL_OFFSET) |
-                       (((spi->mode & SPI_CPHA) ? 1 : 0) << SPI_SCPH_OFFSET))
+                       (((spi->mode & SPI_CPHA) ? 1 : 0) << SPI_SCPH_OFFSET) |
+                       (((spi->mode & SPI_LOOP) ? 1 : 0) << SPI_SRL_OFFSET))
                | (chip->tmode << SPI_TMOD_OFFSET);
 
        /*