commit 3aef463222eaf1ca505629e93a0b64e4040a4472
author Matthias Seidel <kernel@mseidel.net> Wed Sep 07 17:45:30 2016 +0200
committer Mark Brown <broonie@kernel.org> Mon Sep 12 19:59:08 2016 +0100
tree c133a67256a92cd432ad53fd60387220c4a828ca
parent 13b10301b858e355613bfc6dc297580bf34d3fb5

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>

drivers/spi/spi-dw.c

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index c85e4b3..27960e4 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -300,7 +300,7 @@
 	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;