| Message ID | 20190830215910.31590-1-daniel.baluta@nxp.com |
|---|---|
| State | New |
| Headers | show |
| Series | ASoC: fsl_sai: Implement set_bclk_ratio | expand |
On Sat, Aug 31, 2019 at 12:59:10AM +0300, Daniel Baluta wrote: > From: Viorel Suman <viorel.suman@nxp.com> > > This is to allow machine drivers to set a certain bitclk rate > which might not be exactly rate * frame size. Just a quick thought of mine: slot_width and slots could be set via set_dai_tdm_slot() actually, while set_bclk_ratio() would override that one with your change. I'm not sure which one could be more important...so would you mind elaborating your use case? Thanks Nicolin > > Cc: NXP Linux Team <linux-imx@nxp.com> > Signed-off-by: Viorel Suman <viorel.suman@nxp.com> > Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> > --- > sound/soc/fsl/fsl_sai.c | 21 +++++++++++++++++++-- > sound/soc/fsl/fsl_sai.h | 1 + > 2 files changed, 20 insertions(+), 2 deletions(-) > > diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c > index fe126029f4e3..e896b577b1f7 100644 > --- a/sound/soc/fsl/fsl_sai.c > +++ b/sound/soc/fsl/fsl_sai.c > @@ -137,6 +137,16 @@ static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask, > return 0; > } > > +static int fsl_sai_set_dai_bclk_ratio(struct snd_soc_dai *dai, > + unsigned int ratio) > +{ > + struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai); > + > + sai->bclk_ratio = ratio; > + > + return 0; > +} > + > static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai, > int clk_id, unsigned int freq, int fsl_dir) > { > @@ -423,8 +433,14 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream, > slot_width = sai->slot_width; > > if (!sai->is_slave_mode) { > - ret = fsl_sai_set_bclk(cpu_dai, tx, > - slots * slot_width * params_rate(params)); > + if (sai->bclk_ratio) > + ret = fsl_sai_set_bclk(cpu_dai, tx, > + sai->bclk_ratio * > + params_rate(params)); > + else > + ret = fsl_sai_set_bclk(cpu_dai, tx, > + slots * slot_width * > + params_rate(params)); > if (ret) > return ret; > > @@ -640,6 +656,7 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream, > } > > static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = { > + .set_bclk_ratio = fsl_sai_set_dai_bclk_ratio, > .set_sysclk = fsl_sai_set_dai_sysclk, > .set_fmt = fsl_sai_set_dai_fmt, > .set_tdm_slot = fsl_sai_set_dai_tdm_slot, > diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h > index 3a3f6f8e5595..f96f8d97489d 100644 > --- a/sound/soc/fsl/fsl_sai.h > +++ b/sound/soc/fsl/fsl_sai.h > @@ -177,6 +177,7 @@ struct fsl_sai { > unsigned int mclk_streams; > unsigned int slots; > unsigned int slot_width; > + unsigned int bclk_ratio; > > const struct fsl_sai_soc_data *soc_data; > struct snd_dmaengine_dai_dma_data dma_params_rx; > -- > 2.17.1 >
On Thu, Sep 05, 2019 at 06:29:39PM -0700, Nicolin Chen wrote: > On Sat, Aug 31, 2019 at 12:59:10AM +0300, Daniel Baluta wrote: > > This is to allow machine drivers to set a certain bitclk rate > > which might not be exactly rate * frame size. > Just a quick thought of mine: slot_width and slots could be > set via set_dai_tdm_slot() actually, while set_bclk_ratio() > would override that one with your change. I'm not sure which > one could be more important...so would you mind elaborating > your use case? The reason we have both operations is partly that some hardware can configure the ratio but not do TDM and partly that setting TDM slots forces us to configure the slot size depending on the current stream configuration while just setting the ratio means we can just fix the configuration once. I'd say it's just a user error to try to do both simultaneously.
On Wed, Sep 11, 2019 at 2:01 PM Mark Brown <broonie@kernel.org> wrote: > > On Thu, Sep 05, 2019 at 06:29:39PM -0700, Nicolin Chen wrote: > > On Sat, Aug 31, 2019 at 12:59:10AM +0300, Daniel Baluta wrote: > > > > This is to allow machine drivers to set a certain bitclk rate > > > which might not be exactly rate * frame size. > > > Just a quick thought of mine: slot_width and slots could be > > set via set_dai_tdm_slot() actually, while set_bclk_ratio() > > would override that one with your change. I'm not sure which > > one could be more important...so would you mind elaborating > > your use case? > > The reason we have both operations is partly that some hardware > can configure the ratio but not do TDM and partly that setting > TDM slots forces us to configure the slot size depending on the > current stream configuration while just setting the ratio means > we can just fix the configuration once. I'd say it's just a user > error to try to do both simultaneously. Yes, exactly. We wanted to have a better control of bclk freq. Sorry for the late answer, I'm traveling.
On Sat, Aug 31, 2019 at 12:59:10AM +0300, Daniel Baluta wrote: > From: Viorel Suman <viorel.suman@nxp.com> > > This is to allow machine drivers to set a certain bitclk rate > which might not be exactly rate * frame size. > > Cc: NXP Linux Team <linux-imx@nxp.com> > Signed-off-by: Viorel Suman <viorel.suman@nxp.com> > Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com> Acked-by: Nicolin Chen <nicoleotsuka@gmail.com> > --- > sound/soc/fsl/fsl_sai.c | 21 +++++++++++++++++++-- > sound/soc/fsl/fsl_sai.h | 1 + > 2 files changed, 20 insertions(+), 2 deletions(-) > > diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c > index fe126029f4e3..e896b577b1f7 100644 > --- a/sound/soc/fsl/fsl_sai.c > +++ b/sound/soc/fsl/fsl_sai.c > @@ -137,6 +137,16 @@ static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask, > return 0; > } > > +static int fsl_sai_set_dai_bclk_ratio(struct snd_soc_dai *dai, > + unsigned int ratio) > +{ > + struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai); > + > + sai->bclk_ratio = ratio; > + > + return 0; > +} > + > static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai, > int clk_id, unsigned int freq, int fsl_dir) > { > @@ -423,8 +433,14 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream, > slot_width = sai->slot_width; > > if (!sai->is_slave_mode) { > - ret = fsl_sai_set_bclk(cpu_dai, tx, > - slots * slot_width * params_rate(params)); > + if (sai->bclk_ratio) > + ret = fsl_sai_set_bclk(cpu_dai, tx, > + sai->bclk_ratio * > + params_rate(params)); > + else > + ret = fsl_sai_set_bclk(cpu_dai, tx, > + slots * slot_width * > + params_rate(params)); > if (ret) > return ret; > > @@ -640,6 +656,7 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream, > } > > static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = { > + .set_bclk_ratio = fsl_sai_set_dai_bclk_ratio, > .set_sysclk = fsl_sai_set_dai_sysclk, > .set_fmt = fsl_sai_set_dai_fmt, > .set_tdm_slot = fsl_sai_set_dai_tdm_slot, > diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h > index 3a3f6f8e5595..f96f8d97489d 100644 > --- a/sound/soc/fsl/fsl_sai.h > +++ b/sound/soc/fsl/fsl_sai.h > @@ -177,6 +177,7 @@ struct fsl_sai { > unsigned int mclk_streams; > unsigned int slots; > unsigned int slot_width; > + unsigned int bclk_ratio; > > const struct fsl_sai_soc_data *soc_data; > struct snd_dmaengine_dai_dma_data dma_params_rx; > -- > 2.17.1 >
On Wed, Sep 11, 2019 at 04:06:41PM +0300, Daniel Baluta wrote: > On Wed, Sep 11, 2019 at 2:01 PM Mark Brown <broonie@kernel.org> wrote: > > > > On Thu, Sep 05, 2019 at 06:29:39PM -0700, Nicolin Chen wrote: > > > On Sat, Aug 31, 2019 at 12:59:10AM +0300, Daniel Baluta wrote: > > > > > > This is to allow machine drivers to set a certain bitclk rate > > > > which might not be exactly rate * frame size. > > > > > Just a quick thought of mine: slot_width and slots could be > > > set via set_dai_tdm_slot() actually, while set_bclk_ratio() > > > would override that one with your change. I'm not sure which > > > one could be more important...so would you mind elaborating > > > your use case? > > > > The reason we have both operations is partly that some hardware > > can configure the ratio but not do TDM and partly that setting > > TDM slots forces us to configure the slot size depending on the > > current stream configuration while just setting the ratio means > > we can just fix the configuration once. I'd say it's just a user > > error to try to do both simultaneously. > > Yes, exactly. We wanted to have a better control of bclk freq. > Sorry for the late answer, I'm traveling. I see. Thanks for the explain. Just acked.
diff --git a/sound/soc/fsl/fsl_sai.c b/sound/soc/fsl/fsl_sai.c index fe126029f4e3..e896b577b1f7 100644 --- a/sound/soc/fsl/fsl_sai.c +++ b/sound/soc/fsl/fsl_sai.c @@ -137,6 +137,16 @@ static int fsl_sai_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, u32 tx_mask, return 0; } +static int fsl_sai_set_dai_bclk_ratio(struct snd_soc_dai *dai, + unsigned int ratio) +{ + struct fsl_sai *sai = snd_soc_dai_get_drvdata(dai); + + sai->bclk_ratio = ratio; + + return 0; +} + static int fsl_sai_set_dai_sysclk_tr(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int fsl_dir) { @@ -423,8 +433,14 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream, slot_width = sai->slot_width; if (!sai->is_slave_mode) { - ret = fsl_sai_set_bclk(cpu_dai, tx, - slots * slot_width * params_rate(params)); + if (sai->bclk_ratio) + ret = fsl_sai_set_bclk(cpu_dai, tx, + sai->bclk_ratio * + params_rate(params)); + else + ret = fsl_sai_set_bclk(cpu_dai, tx, + slots * slot_width * + params_rate(params)); if (ret) return ret; @@ -640,6 +656,7 @@ static void fsl_sai_shutdown(struct snd_pcm_substream *substream, } static const struct snd_soc_dai_ops fsl_sai_pcm_dai_ops = { + .set_bclk_ratio = fsl_sai_set_dai_bclk_ratio, .set_sysclk = fsl_sai_set_dai_sysclk, .set_fmt = fsl_sai_set_dai_fmt, .set_tdm_slot = fsl_sai_set_dai_tdm_slot, diff --git a/sound/soc/fsl/fsl_sai.h b/sound/soc/fsl/fsl_sai.h index 3a3f6f8e5595..f96f8d97489d 100644 --- a/sound/soc/fsl/fsl_sai.h +++ b/sound/soc/fsl/fsl_sai.h @@ -177,6 +177,7 @@ struct fsl_sai { unsigned int mclk_streams; unsigned int slots; unsigned int slot_width; + unsigned int bclk_ratio; const struct fsl_sai_soc_data *soc_data; struct snd_dmaengine_dai_dma_data dma_params_rx;