diff options
| author | Miroslav Sustek <sustmidown@centrum.cz> | 2009-04-06 20:07:04 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-06-16 19:14:19 -0300 |
| commit | 7561300a7cea56b61fa28b36d40cdfab22af38bd (patch) | |
| tree | b51ac6a211adfd23bc9125e78cadb1b0af0b5616 /drivers/media/video/cx88 | |
| parent | 2325a6b98609b6559ce5da7528fc0f5a6d0d8e9b (diff) | |
V4L/DVB (11441): cx88-dsp: fixing 64bit math
cx88-dsp: fixing 64bit math on 32bit kernels
Some gcc versions report the missing of __divdi3
[mchehab.redhat.com: CodingStyle fixes]
Signed-off-by: Miroslav Sustek <sustmidown@centrum.cz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/cx88')
| -rw-r--r-- | drivers/media/video/cx88/cx88-dsp.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/media/video/cx88/cx88-dsp.c b/drivers/media/video/cx88/cx88-dsp.c index a78286e853c..3e5eaf3fe2a 100644 --- a/drivers/media/video/cx88/cx88-dsp.c +++ b/drivers/media/video/cx88/cx88-dsp.c @@ -22,6 +22,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/jiffies.h> +#include <asm/div64.h> #include "cx88.h" #include "cx88-reg.h" @@ -100,13 +101,25 @@ static u32 int_goertzel(s16 x[], u32 N, u32 freq) s32 s_prev2 = 0; s32 coeff = 2*int_cos(freq); u32 i; + + u64 tmp; + u32 divisor; + for (i = 0; i < N; i++) { s32 s = x[i] + ((s64)coeff*s_prev/32768) - s_prev2; s_prev2 = s_prev; s_prev = s; } - return (u32)(((s64)s_prev2*s_prev2 + (s64)s_prev*s_prev - - (s64)coeff*s_prev2*s_prev/32768)/N/N); + + tmp = (s64)s_prev2 * s_prev2 + (s64)s_prev * s_prev - + (s64)coeff * s_prev2 * s_prev / 32768; + + /* XXX: N must be low enough so that N*N fits in s32. + * Else we need two divisions. */ + divisor = N * N; + do_div(tmp, divisor); + + return (u32) tmp; } static u32 freq_magnitude(s16 x[], u32 N, u32 freq) |