linux-kernel - [PATCH 3.19.y-ckt 129/164] i2c: img-scb: use DIV_ROUND

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Date:	Wed,  2 Dec 2015 08:59:40 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sifan Naeem <sifan.naeem@...tec.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 129/164] i2c: img-scb: use DIV_ROUND_UP to round divisor values

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

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

From: Sifan Naeem <sifan.naeem@...tec.com>

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@...tec.com>
Acked-by: James Hogan <james.hogan@...tec.com>
Reviewed-by: James Hartley <james.hartley@...tec.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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

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