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video/edid: Move int_sqrt() out 

Move int_sqrt() out of drivers/video/edid.c so that it is availible to
other parts of Barebox.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Andrey Smirnov 2016-06-27 21:27:58 -07:00 committed by Sascha Hauer
parent 927176bc16
commit aa750244ee
4 changed files with 69 additions and 29 deletions
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29
drivers/video/edid.c
View File

@ -320,35 +320,6 @@ static u32 fb_get_hblank_by_hfreq(u32 hfreq, u32 xres)
return (hblank);
}
/**
* int_sqrt - rough approximation to sqrt
* @x: integer of which to calculate the sqrt
*
* A very rough approximation to the sqrt() function.
*/
unsigned long int_sqrt(unsigned long x)
{
unsigned long b, m, y = 0;
if (x <= 1)
return x;
m = 1UL << (BITS_PER_LONG - 2);
while (m != 0) {
b = y + m;
y >>= 1;
if (x >= b) {
x -= b;
y += m;
}
m >>= 2;
}
return y;
}
EXPORT_SYMBOL(int_sqrt);
/**
* fb_get_hfreq - estimate hsync
* @vfreq: vertical refresh rate

22
include/int_sqrt.h Normal file
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@ -0,0 +1,22 @@
/*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __INT_SQRT__
#define __INT_SQRT__
unsigned long int_sqrt(unsigned long x);
#endif

1
lib/Makefile
View File

@ -58,3 +58,4 @@ obj-$(CONFIG_BAREBOX_LOGO) += logo/
obj-y += reed_solomon/
obj-$(CONFIG_RATP) += ratp.o
obj-y += list_sort.o
obj-y += int_sqrt.o

46
lib/int_sqrt.c Normal file
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@ -0,0 +1,46 @@
/*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
/**
* int_sqrt - rough approximation to sqrt
* @x: integer of which to calculate the sqrt
*
* A very rough approximation to the sqrt() function.
*/
unsigned long int_sqrt(unsigned long x)
{
unsigned long b, m, y = 0;
if (x <= 1)
return x;
m = 1UL << (BITS_PER_LONG - 2);
while (m != 0) {
b = y + m;
y >>= 1;
if (x >= b) {
x -= b;
y += m;
}
m >>= 2;
}
return y;
}
EXPORT_SYMBOL(int_sqrt);