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[media] m88ds3103: fix SNR reporting on 32-bit arch

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There was 32-bit calculation overflow. Use div_u64.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2014-07-10 08:17:58 -03:00 committed by Mauro Carvalho Chehab
parent 5cb4e2276c
commit 3ae266f80c
2 changed files with 3 additions and 2 deletions
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4
drivers/media/dvb-frontends/m88ds3103.c
View File

@ -879,7 +879,7 @@ static int m88ds3103_read_snr(struct dvb_frontend *fe, u16 *snr)
/* SNR(X) dB = 10 * ln(X) / ln(10) dB */
tmp = DIV_ROUND_CLOSEST(tmp, 8 * M88DS3103_SNR_ITERATIONS);
if (tmp)
*snr = 100ul * intlog2(tmp) / intlog2(10);
*snr = div_u64((u64) 100 * intlog2(tmp), intlog2(10));
else
*snr = 0;
break;
@ -908,7 +908,7 @@ static int m88ds3103_read_snr(struct dvb_frontend *fe, u16 *snr)
/* SNR(X) dB = 10 * log10(X) dB */
if (signal > noise) {
tmp = signal / noise;
*snr = 100ul * intlog10(tmp) / (1 << 24);
*snr = div_u64((u64) 100 * intlog10(tmp), (1 << 24));
} else {
*snr = 0;
}

1
drivers/media/dvb-frontends/m88ds3103_priv.h
View File

@ -22,6 +22,7 @@
#include "dvb_math.h"
#include <linux/firmware.h>
#include <linux/i2c-mux.h>
#include <linux/math64.h>
#define M88DS3103_FIRMWARE "dvb-demod-m88ds3103.fw"
#define M88DS3103_MCLK_KHZ 96000