linux-kernel - [PATCH] staging: sm750fb: refactor the clock frequency calculation method

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Message-ID: <20170702122426.GA17561@lynnl.wit>
Date:   Sun, 2 Jul 2017 20:24:26 +0800
From:   Lynn Lei <lynnl.wit@...il.com>
To:     sudipm.mukherjee@...il.com
Cc:     teddy.wang@...iconmotion.com, gregkh@...uxfoundation.org,
        linux-fbdev@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging: sm750fb: refactor the clock frequency calculation
 method

speed up calculation by merging two divisions into one.

Signed-off-by: Lynn Lei <lynnl.wit@...il.com>
---
 drivers/staging/sm750fb/ddk750_chip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/sm750fb/ddk750_chip.c b/drivers/staging/sm750fb/ddk750_chip.c
index c51761221131..5970c3792f27 100644
--- a/drivers/staging/sm750fb/ddk750_chip.c
+++ b/drivers/staging/sm750fb/ddk750_chip.c
@@ -44,7 +44,7 @@ static unsigned int get_mxclk_freq(void)
 	OD = (pll_reg & PLL_CTRL_OD_MASK) >> PLL_CTRL_OD_SHIFT;
 	POD = (pll_reg & PLL_CTRL_POD_MASK) >> PLL_CTRL_POD_SHIFT;
 
-	return DEFAULT_INPUT_CLOCK * M / N / (1 << OD) / (1 << POD);
+	return DEFAULT_INPUT_CLOCK * M / N / (1 << (OD + POD));
 }
 
 /*
-- 
2.13.2