spi: dw: round up result of calculation for clock divider

Avoid ending up with a higher frequency than requested

Signed-off-by: Matthias Seidel <kernel@mseidel.net>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index c85e4b3..27960e4 100644 (file)
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -300,7 +300,7 @@ static int dw_spi_transfer_one(struct spi_master *master,
        if (transfer->speed_hz != dws->current_freq) {
                if (transfer->speed_hz != chip->speed_hz) {
                        /* clk_div doesn't support odd number */
-                       chip->clk_div = (dws->max_freq / transfer->speed_hz + 1) & 0xfffe;
+                       chip->clk_div = (DIV_ROUND_UP(dws->max_freq, transfer->speed_hz) + 1) & 0xfffe;
                        chip->speed_hz = transfer->speed_hz;
                }
                dws->current_freq = transfer->speed_hz;