regulator: max8998: Ensure enough delay time for max8998_set_voltage_buck_time_sel

commit 81d0a6ae7befb24c06f4aa4856af7f8d1f612171 upstream.

Use DIV_ROUND_UP to prevent truncation by integer division issue.
This ensures we return enough delay time.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
[bwh: Backported to 3.2: delay is done by driver, not returned to the caller]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/regulator/max8998.c b/drivers/regulator/max8998.c
index 41a1495eec2bc28c5d58a9b68b8c2ef2f7b558a3..27fe1c6ed45cbeabfb60a216c67ca2627ffd1faa 100644 (file)
--- a/drivers/regulator/max8998.c
+++ b/drivers/regulator/max8998.c
@@ -497,7 +497,7 @@ buck2_exit:
 
        difference = desc->min + desc->step*i - previous_vol/1000;
        if (difference > 0)
-               udelay(difference / ((val & 0x0f) + 1));
+               udelay(DIV_ROUND_UP(difference, (val & 0x0f) + 1));
 
        return ret;
 }