spi: sirf: fix word width configuration

commit 9c4b19a07dddda3ba35a2eb9b4134d485908e2f5 upstream.

commit 8c328a262f ("spi: sirf: Avoid duplicate code in various
bits_per_word cases") is wrong in setting data width register of
fifo is not right, it should use sspi->word_width >> 1 to set
related bits. According to hardware spec, the mapping between
register value and data width:
0 - byte
1 - WORD
2 - DWORD

Fixes: 8c328a262f ("spi: sirf: Avoid duplicate code in various bits_per_word cases") is wrong in setting data width register of
Signed-off-by: Qipan Li <Qipan.Li@csr.com>
Signed-off-by: Barry Song <Baohua.Song@csr.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index 6f0602fd74012f298467397f0aca2d15709a5d15..ca67bcf9475a57ebd0d684e76a9791a7d4bac32d 100644 (file)
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -565,9 +565,9 @@ spi_sirfsoc_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
 
        sspi->word_width = DIV_ROUND_UP(bits_per_word, 8);
        txfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) |
-                                          sspi->word_width;
+                                          (sspi->word_width >> 1);
        rxfifo_ctrl = SIRFSOC_SPI_FIFO_THD(SIRFSOC_SPI_FIFO_SIZE / 2) |
-                                          sspi->word_width;
+                                          (sspi->word_width >> 1);
 
        if (!(spi->mode & SPI_CS_HIGH))
                regval |= SIRFSOC_SPI_CS_IDLE_STAT;