[PATCH 3.19.y-ckt 129/164] i2c: img-scb: use DIV_ROUND_UP to round divisor values

From: Kamal Mostafa
Date: Wed Dec 02 2015 - 12:19:38 EST


3.19.8-ckt11 -stable review patch. If anyone has any objections, please let me know.

------------------

From: Sifan Naeem <sifan.naeem@xxxxxxxxxx>

commit 5728d95f2458887ae3d95547c04352bba5080ad6 upstream.

Using % can be slow depending on the architecture.

Using DIV_ROUND_UP is nicer and more efficient way to do it.

Fixes: commit 27bce457d588 ("i2c: img-scb: Add Imagination Technologies I2C SCB driver")
Signed-off-by: Sifan Naeem <sifan.naeem@xxxxxxxxxx>
Acked-by: James Hogan <james.hogan@xxxxxxxxxx>
Reviewed-by: James Hartley <james.hartley@xxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-img-scb.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c
index 3d8b842..ef8eee1 100644
--- a/drivers/i2c/busses/i2c-img-scb.c
+++ b/drivers/i2c/busses/i2c-img-scb.c
@@ -1177,9 +1177,7 @@ static int img_i2c_init(struct img_i2c *i2c)
int_bitrate++;

/* Setup TCKH value */
- tckh = timing.tckh / clk_period;
- if (timing.tckh % clk_period)
- tckh++;
+ tckh = DIV_ROUND_UP(timing.tckh, clk_period);

if (tckh > 0)
data = tckh - 1;
@@ -1199,9 +1197,7 @@ static int img_i2c_init(struct img_i2c *i2c)
img_i2c_writel(i2c, SCB_TIME_TCKL_REG, data);

/* Setup TSDH value */
- tsdh = timing.tsdh / clk_period;
- if (timing.tsdh % clk_period)
- tsdh++;
+ tsdh = DIV_ROUND_UP(timing.tsdh, clk_period);

if (tsdh > 1)
data = tsdh - 1;
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/