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>

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 a78286e853c3..3e5eaf3fe2a6 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)