| Message ID | 20240911122909.133399-4-andrei.simion@microchip.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Improvements for mchp-pdmc | expand |
Hi, Andrei, On 11.09.2024 15:29, Andrei Simion wrote: > From: Codrin Ciubotariu <codrin.ciubotariu@microchip.com> > > Avoid removing these controls, as doing so can cause issues if the stream > is initiated from another control. Ensure these controls remain intact when > the stream is started or finished. Instead of removing them, return an > -EBUSY error code to indicate that the controller is busy, especially when > the audio filter and the SINC filter are in use. > > [andrei.simion@microchip.com: Reword the commit title and the commit > message. Adapt the code from kernel v6.1 -> v6.6 -> latest kernel version.] > > Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com> > Signed-off-by: Andrei Simion <andrei.simion@microchip.com> > --- > sound/soc/atmel/mchp-pdmc.c | 78 ++++++++++++++++--------------------- > 1 file changed, 34 insertions(+), 44 deletions(-) > > diff --git a/sound/soc/atmel/mchp-pdmc.c b/sound/soc/atmel/mchp-pdmc.c > index d97d153ee375..758b3c550b97 100644 > --- a/sound/soc/atmel/mchp-pdmc.c > +++ b/sound/soc/atmel/mchp-pdmc.c > @@ -14,6 +14,7 @@ > #include <linux/of.h> > #include <linux/pm_runtime.h> > #include <linux/regmap.h> > +#include <linux/spinlock.h> > > #include <sound/core.h> > #include <sound/dmaengine_pcm.h> > @@ -113,6 +114,7 @@ struct mchp_pdmc_chmap { > > struct mchp_pdmc { > struct mic_map channel_mic_map[MCHP_PDMC_MAX_CHANNELS]; > + spinlock_t busy_lock; /* lock protecting busy */ > struct device *dev; > struct snd_dmaengine_dai_dma_data addr; > struct regmap *regmap; > @@ -124,6 +126,7 @@ struct mchp_pdmc { > int mic_no; > int sinc_order; > bool audio_filter_en; > + u8 busy:1; Can the spinlock and busy flag be replaced by an atomic variable? > }; > > static const char *const mchp_pdmc_sinc_filter_order_text[] = { > @@ -167,10 +170,19 @@ static int mchp_pdmc_sinc_order_put(struct snd_kcontrol *kcontrol, > return -EINVAL; > > val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l; > - if (val == dd->sinc_order) > + > + spin_lock(&dd->busy_lock); > + if (dd->busy) { > + spin_unlock((&dd->busy_lock)); You can remove () around (&dd->busy_lock). Valid for the rest of occurrences. > + return -EBUSY; > + } > + if (val == dd->sinc_order) { > + spin_unlock((&dd->busy_lock)); > return 0; > + } > > dd->sinc_order = val; > + spin_unlock((&dd->busy_lock)); > > return 1; > } > @@ -193,10 +205,18 @@ static int mchp_pdmc_af_put(struct snd_kcontrol *kcontrol, > struct mchp_pdmc *dd = snd_soc_component_get_drvdata(component); > bool af = uvalue->value.integer.value[0] ? true : false; > > - if (dd->audio_filter_en == af) > + spin_lock(&dd->busy_lock); > + if (dd->busy) { > + spin_unlock((&dd->busy_lock)); > + return -EBUSY; > + } > + if (dd->audio_filter_en == af) { > + spin_unlock((&dd->busy_lock)); > return 0; > + } > > dd->audio_filter_en = af; > + spin_unlock((&dd->busy_lock)); > > return 1; > } > @@ -379,52 +399,10 @@ static const struct snd_kcontrol_new mchp_pdmc_snd_controls[] = { > }, > }; > > -static int mchp_pdmc_close(struct snd_soc_component *component, > - struct snd_pcm_substream *substream) > -{ > - return snd_soc_add_component_controls(component, mchp_pdmc_snd_controls, > - ARRAY_SIZE(mchp_pdmc_snd_controls)); > -} > - > -static int mchp_pdmc_open(struct snd_soc_component *component, > - struct snd_pcm_substream *substream) > -{ > - int i; > - > - /* remove controls that can't be changed at runtime */ > - for (i = 0; i < ARRAY_SIZE(mchp_pdmc_snd_controls); i++) { > - const struct snd_kcontrol_new *control = &mchp_pdmc_snd_controls[i]; > - struct snd_ctl_elem_id id; > - int err; > - > - if (component->name_prefix) > - snprintf(id.name, sizeof(id.name), "%s %s", component->name_prefix, > - control->name); > - else > - strscpy(id.name, control->name, sizeof(id.name)); > - > - id.numid = 0; > - id.iface = control->iface; > - id.device = control->device; > - id.subdevice = control->subdevice; > - id.index = control->index; > - err = snd_ctl_remove_id(component->card->snd_card, &id); > - if (err < 0) > - dev_err(component->dev, "%d: Failed to remove %s\n", err, > - control->name); > - } > - > - return 0; > -} > - > static const struct snd_soc_component_driver mchp_pdmc_dai_component = { > .name = "mchp-pdmc", > .controls = mchp_pdmc_snd_controls, > .num_controls = ARRAY_SIZE(mchp_pdmc_snd_controls), > - .open = &mchp_pdmc_open, > - .close = &mchp_pdmc_close, > - .legacy_dai_naming = 1, > - .trigger_start = SND_SOC_TRIGGER_ORDER_LDC, > }; > > static const unsigned int mchp_pdmc_1mic[] = {1}; > @@ -587,6 +565,13 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, > cfgr_val |= MCHP_PDMC_CFGR_BSSEL(i); > } > > + /* > + * from these point forward, we consider the controller busy, so the > + * audio filter and SINC order can't be changed > + */ > + spin_lock(&dd->busy_lock); > + dd->busy = 1; > + spin_unlock((&dd->busy_lock)); > for (osr_start = dd->audio_filter_en ? 64 : 8; > osr_start <= 256 && best_diff_rate; osr_start *= 2) { > long round_rate; > @@ -1099,6 +1084,7 @@ static int mchp_pdmc_probe(struct platform_device *pdev) > */ > dd->audio_filter_en = true; > dd->sinc_order = 3; > + spin_lock_init(&dd->busy_lock); > > dd->addr.addr = (dma_addr_t)res->start + MCHP_PDMC_RHR; > platform_set_drvdata(pdev, dd); > @@ -1143,6 +1129,10 @@ static void mchp_pdmc_remove(struct platform_device *pdev) > { > struct mchp_pdmc *dd = platform_get_drvdata(pdev); > > + spin_lock(&dd->busy_lock); > + dd->busy = 0; > + spin_unlock((&dd->busy_lock)); > + > if (!pm_runtime_status_suspended(dd->dev)) > mchp_pdmc_runtime_suspend(dd->dev); >
>> struct mchp_pdmc { >> struct mic_map channel_mic_map[MCHP_PDMC_MAX_CHANNELS]; >> + spinlock_t busy_lock; /* lock protecting busy */ >> struct device *dev; >> struct snd_dmaengine_dai_dma_data addr; >> struct regmap *regmap; >> @@ -124,6 +126,7 @@ struct mchp_pdmc { >> int mic_no; >> int sinc_order; >> bool audio_filter_en; >> + u8 busy:1; > Can the spinlock and busy flag be replaced by an atomic variable? I will use atomic_t variable with atomic_set and atomic_read. I will do a test and send V2. >> }; >> >> static const char *const mchp_pdmc_sinc_filter_order_text[] = { >> @@ -167,10 +170,19 @@ static int mchp_pdmc_sinc_order_put(struct snd_kcontrol *kcontrol, >> return -EINVAL; >> >> val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l; >> - if (val == dd->sinc_order) >> + >> + spin_lock(&dd->busy_lock); >> + if (dd->busy) { >> + spin_unlock((&dd->busy_lock)); > You can remove () around (&dd->busy_lock). Valid for the rest of occurrences. OK. Got it! >> + return -EBUSY; >> + } >> + if (val == dd->sinc_order) { >> + spin_unlock((&dd->busy_lock)); >> return 0; >> + } >> >> dd->sinc_order = val; >> + spin_unlock((&dd->busy_lock)); >> >> return 1; >> }
diff --git a/sound/soc/atmel/mchp-pdmc.c b/sound/soc/atmel/mchp-pdmc.c index d97d153ee375..758b3c550b97 100644 --- a/sound/soc/atmel/mchp-pdmc.c +++ b/sound/soc/atmel/mchp-pdmc.c @@ -14,6 +14,7 @@ #include <linux/of.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> +#include <linux/spinlock.h> #include <sound/core.h> #include <sound/dmaengine_pcm.h> @@ -113,6 +114,7 @@ struct mchp_pdmc_chmap { struct mchp_pdmc { struct mic_map channel_mic_map[MCHP_PDMC_MAX_CHANNELS]; + spinlock_t busy_lock; /* lock protecting busy */ struct device *dev; struct snd_dmaengine_dai_dma_data addr; struct regmap *regmap; @@ -124,6 +126,7 @@ struct mchp_pdmc { int mic_no; int sinc_order; bool audio_filter_en; + u8 busy:1; }; static const char *const mchp_pdmc_sinc_filter_order_text[] = { @@ -167,10 +170,19 @@ static int mchp_pdmc_sinc_order_put(struct snd_kcontrol *kcontrol, return -EINVAL; val = snd_soc_enum_item_to_val(e, item[0]) << e->shift_l; - if (val == dd->sinc_order) + + spin_lock(&dd->busy_lock); + if (dd->busy) { + spin_unlock((&dd->busy_lock)); + return -EBUSY; + } + if (val == dd->sinc_order) { + spin_unlock((&dd->busy_lock)); return 0; + } dd->sinc_order = val; + spin_unlock((&dd->busy_lock)); return 1; } @@ -193,10 +205,18 @@ static int mchp_pdmc_af_put(struct snd_kcontrol *kcontrol, struct mchp_pdmc *dd = snd_soc_component_get_drvdata(component); bool af = uvalue->value.integer.value[0] ? true : false; - if (dd->audio_filter_en == af) + spin_lock(&dd->busy_lock); + if (dd->busy) { + spin_unlock((&dd->busy_lock)); + return -EBUSY; + } + if (dd->audio_filter_en == af) { + spin_unlock((&dd->busy_lock)); return 0; + } dd->audio_filter_en = af; + spin_unlock((&dd->busy_lock)); return 1; } @@ -379,52 +399,10 @@ static const struct snd_kcontrol_new mchp_pdmc_snd_controls[] = { }, }; -static int mchp_pdmc_close(struct snd_soc_component *component, - struct snd_pcm_substream *substream) -{ - return snd_soc_add_component_controls(component, mchp_pdmc_snd_controls, - ARRAY_SIZE(mchp_pdmc_snd_controls)); -} - -static int mchp_pdmc_open(struct snd_soc_component *component, - struct snd_pcm_substream *substream) -{ - int i; - - /* remove controls that can't be changed at runtime */ - for (i = 0; i < ARRAY_SIZE(mchp_pdmc_snd_controls); i++) { - const struct snd_kcontrol_new *control = &mchp_pdmc_snd_controls[i]; - struct snd_ctl_elem_id id; - int err; - - if (component->name_prefix) - snprintf(id.name, sizeof(id.name), "%s %s", component->name_prefix, - control->name); - else - strscpy(id.name, control->name, sizeof(id.name)); - - id.numid = 0; - id.iface = control->iface; - id.device = control->device; - id.subdevice = control->subdevice; - id.index = control->index; - err = snd_ctl_remove_id(component->card->snd_card, &id); - if (err < 0) - dev_err(component->dev, "%d: Failed to remove %s\n", err, - control->name); - } - - return 0; -} - static const struct snd_soc_component_driver mchp_pdmc_dai_component = { .name = "mchp-pdmc", .controls = mchp_pdmc_snd_controls, .num_controls = ARRAY_SIZE(mchp_pdmc_snd_controls), - .open = &mchp_pdmc_open, - .close = &mchp_pdmc_close, - .legacy_dai_naming = 1, - .trigger_start = SND_SOC_TRIGGER_ORDER_LDC, }; static const unsigned int mchp_pdmc_1mic[] = {1}; @@ -587,6 +565,13 @@ static int mchp_pdmc_hw_params(struct snd_pcm_substream *substream, cfgr_val |= MCHP_PDMC_CFGR_BSSEL(i); } + /* + * from these point forward, we consider the controller busy, so the + * audio filter and SINC order can't be changed + */ + spin_lock(&dd->busy_lock); + dd->busy = 1; + spin_unlock((&dd->busy_lock)); for (osr_start = dd->audio_filter_en ? 64 : 8; osr_start <= 256 && best_diff_rate; osr_start *= 2) { long round_rate; @@ -1099,6 +1084,7 @@ static int mchp_pdmc_probe(struct platform_device *pdev) */ dd->audio_filter_en = true; dd->sinc_order = 3; + spin_lock_init(&dd->busy_lock); dd->addr.addr = (dma_addr_t)res->start + MCHP_PDMC_RHR; platform_set_drvdata(pdev, dd); @@ -1143,6 +1129,10 @@ static void mchp_pdmc_remove(struct platform_device *pdev) { struct mchp_pdmc *dd = platform_get_drvdata(pdev); + spin_lock(&dd->busy_lock); + dd->busy = 0; + spin_unlock((&dd->busy_lock)); + if (!pm_runtime_status_suspended(dd->dev)) mchp_pdmc_runtime_suspend(dd->dev);