From: Hoan Nguyen An <[email protected]> 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 <[email protected]> --- drivers/spi/spi-sh-msiof.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index 351470b..617cdf3 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; -- 2.7.4
