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Commit 5c894cd1 authored by Pavel Pisa's avatar Pavel Pisa Committed by Russell King
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[ARM] 3990/1: i.MX/MX1 more precise PLL decode 



The future high resolution support inclusion utilizes
imx_decode_pll() in timer base frequency computation.
This use requires more precise computation without
discarding 10 bits by shifting left.

Signed-off-by: default avatarPavel Pisa <pisa@cmp.felk.cvut.cz>
Acked-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 9073341c

arch/arm/mach-imx/generic.c

+8 −1
Original line number Diff line number Diff line
@@ -104,6 +104,9 @@ EXPORT_SYMBOL(imx_gpio_mode); 
 */

static unsigned int imx_decode_pll(unsigned int pll)

{

	unsigned long long ll;

	unsigned long quot;



	u32 mfi = (pll >> 10) & 0xf;

	u32 mfn = pll & 0x3ff;

	u32 mfd = (pll >> 16) & 0x3ff;
@@ -112,7 +115,11 @@ static unsigned int imx_decode_pll(unsigned int pll) 


	mfi = mfi <= 5 ? 5 : mfi;



	return (2 * (f_ref>>10) * ( (mfi<<10) + (mfn<<10) / (mfd+1) )) / (pd+1);

	ll = 2 * (unsigned long long)f_ref * ( (mfi<<16) + (mfn<<16) / (mfd+1) );

	quot = (pd+1) * (1<<16);

	ll += quot / 2;

	do_div(ll, quot);

	return (unsigned int) ll;

}



unsigned int imx_get_system_clk(void)