[2/2] spi: dw: round up result of calculation for clock divider

Commit Message

Matthias Seidel Sept. 2, 2016, 3:41 p.m. UTC

avoid ending up with a higher frequency than requested

---
 drivers/spi/spi-dw.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index c85e4b3..2fd517d 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -300,7 +300,8 @@  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 = ((dws->max_freq + transfer->speed_hz) /
+                transfer->speed_hz + 1) & 0xfffe;
             chip->speed_hz = transfer->speed_hz;
         }
         dws->current_freq = transfer->speed_hz;