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

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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>
This commit is contained in:
Matthias Seidel 2016-09-07 17:45:30 +02:00 committed by Mark Brown
parent 13b10301b8
commit 3aef463222
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-dw.c
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@ -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;