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media: fc2580: fix tuning failure on 32-bit arch 

commit 8845cc6415ec28ef8d57b3fb81c75ef9bce69c5f upstream.

There was some frequency calculation overflows which caused tuning
failure on 32-bit architecture. Use 64-bit numbers where needed in
order to avoid calculation overflows.

Thanks for the Finnish person, who asked remain anonymous, reporting,
testing and suggesting the fix.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Antti Palosaari 2014-04-10 21:18:16 -03:00 committed by Greg Kroah-Hartman
parent 0a4e3565df
commit 4f792a2972
2 changed files with 4 additions and 3 deletions
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6
drivers/media/tuners/fc2580.c
View File

@ -195,7 +195,7 @@ static int fc2580_set_params(struct dvb_frontend *fe)
f_ref = 2UL * priv->cfg->clock / r_val;
n_val = div_u64_rem(f_vco, f_ref, &k_val);
k_val_reg = 1UL * k_val * (1 << 20) / f_ref;
k_val_reg = div_u64(1ULL * k_val * (1 << 20), f_ref);
ret = fc2580_wr_reg(priv, 0x18, r18_val | ((k_val_reg >> 16) & 0xff));
if (ret < 0)
@ -348,8 +348,8 @@ static int fc2580_set_params(struct dvb_frontend *fe)
if (ret < 0)
goto err;
ret = fc2580_wr_reg(priv, 0x37, 1UL * priv->cfg->clock * \
fc2580_if_filter_lut[i].mul / 1000000000);
ret = fc2580_wr_reg(priv, 0x37, div_u64(1ULL * priv->cfg->clock *
fc2580_if_filter_lut[i].mul, 1000000000));
if (ret < 0)
goto err;

1
drivers/media/tuners/fc2580_priv.h
View File

@ -22,6 +22,7 @@
#define FC2580_PRIV_H
#include "fc2580.h"
#include <linux/math64.h>
struct fc2580_reg_val {
u8 reg;