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authorHoan Nguyen An <na-hoan@jinso.co.jp>2019-01-18 12:29:31 +0300
committerMark Brown <broonie@kernel.org>2019-01-18 21:20:52 +0300
commitd05e3eadb1bccbf276742e13b2c898959c310ce6 (patch)
treeec9948c58091cf2345f465736434d03d1696d378 /drivers/spi/spi-sh-msiof.c
parentf70351ae06af0ccb1f7f91b86395ae5eba9c3c8c (diff)
downloadlinux-d05e3eadb1bccbf276742e13b2c898959c310ce6.tar.xz
spi: sh-msiof: Use DMA if possible
Currently, this driver only supports feature for DMA 32-bits. In this case, only if the data length is divisible by 4 to use DMA, otherwise PIO will be used. This patch will suggest use the DMA 32-bits with 4bytes of words, then the remaining data will be transmitted by PIO mode. Signed-off-by: Hoan Nguyen An <na-hoan@jinso.co.jp> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-sh-msiof.c')
-rw-r--r--drivers/spi/spi-sh-msiof.c8
1 files changed, 2 insertions, 6 deletions
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 351470bc020d..617cdf3be050 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -937,17 +937,13 @@ static int sh_msiof_transfer_one(struct spi_master *master,
unsigned int l = 0;
if (tx_buf)
- l = min(len, p->tx_fifo_size * 4);
+ l = min(round_down(len, 4), p->tx_fifo_size * 4);
if (rx_buf)
- l = min(len, p->rx_fifo_size * 4);
+ l = min(round_down(len, 4), p->rx_fifo_size * 4);
if (bits <= 8) {
- if (l & 3)
- break;
copy32 = copy_bswap32;
} else if (bits <= 16) {
- if (l & 3)
- break;
copy32 = copy_wswap32;
} else {
copy32 = copy_plain32;