Even though the current driver calculates the dividers to be used depending on the clocks and sample rates, enabling the internal ratio can lead to noticeable improvements in the audio quality, based on my testing.
As stated in the documentation, "When USRx=1 and IDRx=0, ASRC internal measured ratio will be used", so setting this bit even when not in "Ideal Ratio" mode still makes sense.
Signed-off-by: Arnaud Ferraris arnaud.ferraris@collabora.com --- sound/soc/fsl/fsl_asrc.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/sound/soc/fsl/fsl_asrc.c b/sound/soc/fsl/fsl_asrc.c index bfd35b9c0781..cc0f70c9140f 100644 --- a/sound/soc/fsl/fsl_asrc.c +++ b/sound/soc/fsl/fsl_asrc.c @@ -465,7 +465,7 @@ static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair, bool use_ideal_rate) regmap_update_bits(asrc->regmap, REG_ASRCTR, ASRCTR_ATSi_MASK(index), ASRCTR_ATS(index)); regmap_update_bits(asrc->regmap, REG_ASRCTR, - ASRCTR_USRi_MASK(index), 0); + ASRCTR_USRi_MASK(index), ASRCTR_USR(index));
/* Set the input and output clock sources */ regmap_update_bits(asrc->regmap, REG_ASRCSR, @@ -507,8 +507,7 @@ static int fsl_asrc_config_pair(struct fsl_asrc_pair *pair, bool use_ideal_rate)
/* Enable Ideal Ratio mode */ regmap_update_bits(asrc->regmap, REG_ASRCTR, - ASRCTR_IDRi_MASK(index) | ASRCTR_USRi_MASK(index), - ASRCTR_IDR(index) | ASRCTR_USR(index)); + ASRCTR_IDRi_MASK(index), ASRCTR_IDR(index);
fsl_asrc_sel_proc(inrate, outrate, &pre_proc, &post_proc);