From: Matthias Seidel <kernel@mseidel.net>
Date: Wed, 7 Sep 2016 15:45:30 +0000 (+0200)
Subject: spi: dw: round up result of calculation for clock divider
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3aef463222eaf1ca505629e93a0b64e4040a4472;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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 c85e4b327a4a..27960e46135d 100644
--- 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;