spi: rspi: Round up division to avoid slave overclocking

[deliverable/linux.git] / drivers / spi / spi-rspi.c

diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 1fb0ad213324eadd2ef2a9cd9088880c42e5e722..5639f9529e0bb8f87eb8b16f407ff00fc7b581c2 100644 (file)
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -266,7 +266,8 @@ static int rspi_set_config_register(struct rspi_data *rspi, int access_size)
        rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
 
        /* Sets transfer bit rate */
-       spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
+       spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
+                           2 * rspi->max_speed_hz) - 1;
        rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
 
        /* Disable dummy transmission, set 16-bit word access, 1 frame */
@@ -302,7 +303,8 @@ static int rspi_rz_set_config_register(struct rspi_data *rspi, int access_size)
        rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
 
        /* Sets transfer bit rate */
-       spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz) - 1;
+       spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk),
+                           2 * rspi->max_speed_hz) - 1;
        rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
 
        /* Disable dummy transmission, set byte access */
@@ -335,7 +337,7 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
        rspi_write8(rspi, rspi->sppcr, RSPI_SPPCR);
 
        /* Sets transfer bit rate */
-       spbr = clk_get_rate(rspi->clk) / (2 * rspi->max_speed_hz);
+       spbr = DIV_ROUND_UP(clk_get_rate(rspi->clk), 2 * rspi->max_speed_hz);
        rspi_write8(rspi, clamp(spbr, 0, 255), RSPI_SPBR);
 
        /* Disable dummy transmission, set byte access */