m88ts2022: fix high symbol rate transponders missing on 32bit platform.
PATCH 1/1 m88ts2022: fix high symbol rate transponders missing on 32bit platform.
The current m88ts2022 driver will miss the following high symbol rate transponders on Telstar 18 138.0. 12385 H 43200,
12690 H 43200,
12538 V 41250...
the code for f_3db_hz will overflow for the high symbol rate.
for example, symbol rate=41250 KS/ssymbol_rate * 135UL = 5568750000(1 4BEC 61B0), the value is larger than unsigned int on 32bit platform. that makes the wrong result.
Exchanging the div and mul position fixs it.
Signed-off-by Nibble Max <[email protected]>
--- drivers/media/tuners/m88ts2022.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
drivers/media/tuners/m88ts2022.c +1 -1
@@ -314,7 +314,7 @@ static int m88ts2022_set_params(struct dvb_frontend *fe) div_min = gdiv28 *78 /100 ; div_max =clamp_val (div_max,0U ,63U ); - f_3db_hz = c->symbol_rate *135UL /200UL ; + f_3db_hz = (c->symbol_rate /200UL ) *135UL ; f_3db_hz +=2000000U + (frequency_offset_khz *1000U ); f_3db_hz =clamp (f_3db_hz,7000000U ,40000000U );
Signature · 1 line
1.9.1