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From: Wolfram Sang <w.sang@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/8] arm: mxs: make get_hclk result useable for upcoming set_hclk
Date: Tue,  8 May 2012 09:53:54 +0200	[thread overview]
Message-ID: <1336463641-27219-2-git-send-email-w.sang@pengutronix.de> (raw)
In-Reply-To: <1336463641-27219-1-git-send-email-w.sang@pengutronix.de>

To avoid getting a different divider due to rounding errors when using
set_hclk later, use DIV_ROUND_UP for the returned value.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
---
 arch/arm/mach-mxs/speed-imx23.c |    5 +++--
 arch/arm/mach-mxs/speed-imx28.c |    5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-mxs/speed-imx23.c b/arch/arm/mach-mxs/speed-imx23.c
index b10c786..c9ca7ac 100644
--- a/arch/arm/mach-mxs/speed-imx23.c
+++ b/arch/arm/mach-mxs/speed-imx23.c
@@ -184,9 +184,10 @@ unsigned imx_get_hclk(void)
 
 	if (readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x20) {
 		rate *= readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x1f;
-		rate >>= 5U; /* / 32 */
+		rate = DIV_ROUND_UP(rate, 32);
 	} else
-		rate /= readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x1f;
+		rate = DIV_ROUND_UP(rate,
+			readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x1f);
 	return rate * 1000;
 }
 
diff --git a/arch/arm/mach-mxs/speed-imx28.c b/arch/arm/mach-mxs/speed-imx28.c
index 67cdbdf..4f4db1b 100644
--- a/arch/arm/mach-mxs/speed-imx28.c
+++ b/arch/arm/mach-mxs/speed-imx28.c
@@ -251,9 +251,10 @@ unsigned imx_get_hclk(void)
 
 	if (readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x20) {
 		rate *= readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x1f;
-		rate /= 32;
+		rate = DIV_ROUND_UP(rate, 32);
 	} else
-		rate /= readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x1f;
+		rate = DIV_ROUND_UP(rate,
+			readl(IMX_CCM_BASE + HW_CLKCTRL_HBUS) & 0x1f);
 	return rate * 1000;
 }
 
-- 
1.7.10


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  reply	other threads:[~2012-05-08  7:54 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-08  7:53 [PATCH 0/8] arm: mxs: add ocotp write support Wolfram Sang
2012-05-08  7:53 ` Wolfram Sang [this message]
2012-05-08  7:53 ` [PATCH 2/8] arm: mxs: add imx_set_hclk Wolfram Sang
2012-05-08  7:53 ` [PATCH 3/8] arm: mxs: refactor access to power domain Wolfram Sang
2012-05-08  7:53 ` [PATCH 4/8] arm: mxs: add POWER_BASE for MX28, too Wolfram Sang
2012-05-08  7:53 ` [PATCH 5/8] arm: mxs: add functions to get/set vddio Wolfram Sang
2012-06-14 10:07   ` Sascha Hauer
2012-05-08  7:53 ` [PATCH 6/8] arm: mxs: refactor timeout routine for ocotp Wolfram Sang
2012-05-08  7:54 ` [PATCH 7/8] arm: mxs: use consistent naming for #defines " Wolfram Sang
2012-05-08  7:54 ` [PATCH 8/8] arm: mxs: add write support " Wolfram Sang
2012-06-14 10:10   ` Sascha Hauer

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