diff options
Diffstat (limited to 'sound/hda/hdac_stream.c')
| -rw-r--r-- | sound/hda/hdac_stream.c | 14 |
1 files changed, 4 insertions, 10 deletions
diff --git a/sound/hda/hdac_stream.c b/sound/hda/hdac_stream.c index 9867555883c3..aa7955fdf68a 100644 --- a/sound/hda/hdac_stream.c +++ b/sound/hda/hdac_stream.c @@ -534,17 +534,11 @@ static void azx_timecounter_init(struct hdac_stream *azx_dev, cc->mask = CLOCKSOURCE_MASK(32); /* - * Converting from 24 MHz to ns means applying a 125/3 factor. - * To avoid any saturation issues in intermediate operations, - * the 125 factor is applied first. The division is applied - * last after reading the timecounter value. - * Applying the 1/3 factor as part of the multiplication - * requires at least 20 bits for a decent precision, however - * overflows occur after about 4 hours or less, not a option. + * Calculate the optimal mult/shift values. The counter wraps + * around after ~178.9 seconds. */ - - cc->mult = 125; /* saturation after 195 years */ - cc->shift = 0; + clocks_calc_mult_shift(&cc->mult, &cc->shift, 24000000, + NSEC_PER_SEC, 178); nsec = 0; /* audio time is elapsed time since trigger */ timecounter_init(tc, cc, nsec); |