From 692247196dd845eef02f26bf2959719b82e935c6 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 3 Mar 2010 14:57:09 +0000 Subject: ASoC: Improve DAPM pop_wait delays Currently during pop/click debug we're inserting a delay both after every log message we generate and at explicit points in the sequence, slowing things down even further than they need to be especially when many writes get coalesced by the sequence generation code. Remove the per-printk delay and ensure that we have explicit delays where we say we want them. Signed-off-by: Mark Brown Acked-by: Liam Girdwood --- sound/soc/soc-dapm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 6c335109578..86ded22e36a 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -97,7 +97,6 @@ static void pop_dbg(u32 pop_time, const char *fmt, ...) if (pop_time) { vprintk(fmt, args); - pop_wait(pop_time); } va_end(args); @@ -314,8 +313,8 @@ static int dapm_update_bits(struct snd_soc_dapm_widget *widget) pop_dbg(codec->pop_time, "pop test %s : %s in %d ms\n", widget->name, widget->power ? "on" : "off", codec->pop_time); - snd_soc_write(codec, widget->reg, new); pop_wait(codec->pop_time); + snd_soc_write(codec, widget->reg, new); } pr_debug("reg %x old %x new %x change %d\n", widget->reg, old, new, change); @@ -1075,6 +1074,7 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) pop_dbg(codec->pop_time, "DAPM sequencing finished, waiting %dms\n", codec->pop_time); + pop_wait(codec->pop_time); return 0; } -- cgit v1.2.3 From da34183e640ed380f708bf9ebcd592afda619028 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 15 Mar 2010 19:23:37 +0000 Subject: ASoC: Allow pins to be force enabled Allow pins to be forced on regardless of their power state. This is intended for use with microphone bias supplies which need to be enabled in order to support microphone detection - in systems without appropriate hardware leaving the microphone unbiased when not in use saves power. The force done at power check time in order to avoid disrupting other power detection logic. Signed-off-by: Mark Brown Acked-by: Liam Girdwood --- include/sound/soc-dapm.h | 3 +++ sound/soc/soc-dapm.c | 35 ++++++++++++++++++++++++++++++++++- 2 files changed, 37 insertions(+), 1 deletion(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h index 5915fc05984..d5d6ba862df 100644 --- a/include/sound/soc-dapm.h +++ b/include/sound/soc-dapm.h @@ -339,6 +339,8 @@ int snd_soc_dapm_disable_pin(struct snd_soc_codec *codec, const char *pin); int snd_soc_dapm_nc_pin(struct snd_soc_codec *codec, const char *pin); int snd_soc_dapm_get_pin_status(struct snd_soc_codec *codec, const char *pin); int snd_soc_dapm_sync(struct snd_soc_codec *codec); +int snd_soc_dapm_force_enable_pin(struct snd_soc_codec *codec, + const char *pin); /* dapm widget types */ enum snd_soc_dapm_type { @@ -426,6 +428,7 @@ struct snd_soc_dapm_widget { unsigned char new:1; /* cnew complete */ unsigned char ext:1; /* has external widgets */ unsigned char suspend:1; /* was active before suspend */ + unsigned char force:1; /* force state */ int (*power_check)(struct snd_soc_dapm_widget *w); diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 86ded22e36a..bbb2135a0b2 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -979,7 +979,10 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) break; default: - power = w->power_check(w); + if (!w->force) + power = w->power_check(w); + else + power = 1; if (power) sys_power = 1; break; @@ -2133,6 +2136,36 @@ int snd_soc_dapm_enable_pin(struct snd_soc_codec *codec, const char *pin) } EXPORT_SYMBOL_GPL(snd_soc_dapm_enable_pin); +/** + * snd_soc_dapm_force_enable_pin - force a pin to be enabled + * @codec: SoC codec + * @pin: pin name + * + * Enables input/output pin regardless of any other state. This is + * intended for use with microphone bias supplies used in microphone + * jack detection. + * + * NOTE: snd_soc_dapm_sync() needs to be called after this for DAPM to + * do any widget power switching. + */ +int snd_soc_dapm_force_enable_pin(struct snd_soc_codec *codec, const char *pin) +{ + struct snd_soc_dapm_widget *w; + + list_for_each_entry(w, &codec->dapm_widgets, list) { + if (!strcmp(w->name, pin)) { + pr_debug("dapm: %s: pin %s\n", codec->name, pin); + w->connected = 1; + w->force = 1; + return 0; + } + } + + pr_err("dapm: %s: configuring unknown pin %s\n", codec->name, pin); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(snd_soc_dapm_force_enable_pin); + /** * snd_soc_dapm_disable_pin - disable pin. * @codec: SoC codec -- cgit v1.2.3 From a6c65736bc2e63392334bd800f1b2754ab55db1e Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 3 Mar 2010 17:45:21 +0000 Subject: ASoC: Remove current PGA control handling A code audit reveals that there are currently no users of the widget controls on PGAs. This is likely to continue to be the case since while there are useful things that can be done with integrating the PGA gain and mute controls with the power sequencing userspace generally wants stereo controls for output stages which this doesn't map onto well. In preparation for implementing something more useful strip out the existing code, leaving the parameters there for use by the new code. Signed-off-by: Mark Brown Acked-by: Liam Girdwood --- sound/soc/soc-dapm.c | 93 ++-------------------------------------------------- 1 file changed, 3 insertions(+), 90 deletions(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index bbb2135a0b2..61128419400 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -321,54 +321,6 @@ static int dapm_update_bits(struct snd_soc_dapm_widget *widget) return change; } -/* ramps the volume up or down to minimise pops before or after a - * DAPM power event */ -static int dapm_set_pga(struct snd_soc_dapm_widget *widget, int power) -{ - const struct snd_kcontrol_new *k = widget->kcontrols; - - if (widget->muted && !power) - return 0; - if (!widget->muted && power) - return 0; - - if (widget->num_kcontrols && k) { - struct soc_mixer_control *mc = - (struct soc_mixer_control *)k->private_value; - unsigned int reg = mc->reg; - unsigned int shift = mc->shift; - int max = mc->max; - unsigned int mask = (1 << fls(max)) - 1; - unsigned int invert = mc->invert; - - if (power) { - int i; - /* power up has happended, increase volume to last level */ - if (invert) { - for (i = max; i > widget->saved_value; i--) - snd_soc_update_bits(widget->codec, reg, mask, i); - } else { - for (i = 0; i < widget->saved_value; i++) - snd_soc_update_bits(widget->codec, reg, mask, i); - } - widget->muted = 0; - } else { - /* power down is about to occur, decrease volume to mute */ - int val = snd_soc_read(widget->codec, reg); - int i = widget->saved_value = (val >> shift) & mask; - if (invert) { - for (; i < mask; i++) - snd_soc_update_bits(widget->codec, reg, mask, i); - } else { - for (; i > 0; i--) - snd_soc_update_bits(widget->codec, reg, mask, i); - } - widget->muted = 1; - } - } - return 0; -} - /* create new dapm mixer control */ static int dapm_new_mixer(struct snd_soc_codec *codec, struct snd_soc_dapm_widget *w) @@ -463,20 +415,10 @@ err: static int dapm_new_pga(struct snd_soc_codec *codec, struct snd_soc_dapm_widget *w) { - struct snd_kcontrol *kcontrol; - int ret = 0; - - if (!w->num_kcontrols) - return -EINVAL; + if (w->num_kcontrols) + pr_err("asoc: PGA controls not supported: '%s'\n", w->name); - kcontrol = snd_soc_cnew(&w->kcontrols[0], w, w->name); - ret = snd_ctl_add(codec->card, kcontrol); - if (ret < 0) { - printk(KERN_ERR "asoc: failed to add kcontrol %s\n", w->name); - return ret; - } - - return ret; + return 0; } /* reset 'walked' bit for each dapm path */ @@ -632,16 +574,8 @@ static int dapm_generic_apply_power(struct snd_soc_dapm_widget *w) return ret; } - /* Lower PGA volume to reduce pops */ - if (w->id == snd_soc_dapm_pga && !w->power) - dapm_set_pga(w, w->power); - dapm_update_bits(w); - /* Raise PGA volume to reduce pops */ - if (w->id == snd_soc_dapm_pga && w->power) - dapm_set_pga(w, w->power); - /* power up post event */ if (w->power && w->event && (w->event_flags & SND_SOC_DAPM_POST_PMU)) { @@ -808,10 +742,6 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, pr_err("%s: pre event failed: %d\n", w->name, ret); } - - /* Lower PGA volume to reduce pops */ - if (w->id == snd_soc_dapm_pga && !w->power) - dapm_set_pga(w, w->power); } if (reg >= 0) { @@ -823,10 +753,6 @@ static void dapm_seq_run_coalesced(struct snd_soc_codec *codec, } list_for_each_entry(w, pending, power_list) { - /* Raise PGA volume to reduce pops */ - if (w->id == snd_soc_dapm_pga && w->power) - dapm_set_pga(w, w->power); - /* power up post event */ if (w->power && w->event && (w->event_flags & SND_SOC_DAPM_POST_PMU)) { @@ -1596,12 +1522,6 @@ int snd_soc_dapm_get_volsw(struct snd_kcontrol *kcontrol, unsigned int invert = mc->invert; unsigned int mask = (1 << fls(max)) - 1; - /* return the saved value if we are powered down */ - if (widget->id == snd_soc_dapm_pga && !widget->power) { - ucontrol->value.integer.value[0] = widget->saved_value; - return 0; - } - ucontrol->value.integer.value[0] = (snd_soc_read(widget->codec, reg) >> shift) & mask; if (shift != rshift) @@ -1661,13 +1581,6 @@ int snd_soc_dapm_put_volsw(struct snd_kcontrol *kcontrol, mutex_lock(&widget->codec->mutex); widget->value = val; - /* save volume value if the widget is powered down */ - if (widget->id == snd_soc_dapm_pga && !widget->power) { - widget->saved_value = val; - mutex_unlock(&widget->codec->mutex); - return 1; - } - if (snd_soc_test_bits(widget->codec, reg, val_mask, val)) { if (val) /* new connection */ -- cgit v1.2.3 From 5b9e87ccccf77f46c006c2cf0988a66d0f3f310d Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Mon, 22 Mar 2010 13:36:13 +0000 Subject: ASoC: Allow force enabled pins to be disabled Some systems, such as those with mechanical jack detection, may wish to force enable a pin (typically mic bias) only some of the time. Support such systems by having disable_pin() also coveer force enabled pins. Signed-off-by: Mark Brown Acked-by: Liam Girdwood --- sound/soc/soc-dapm.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'sound/soc/soc-dapm.c') diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 61128419400..476dbe6daba 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -1266,6 +1266,9 @@ static int snd_soc_dapm_set_pin(struct snd_soc_codec *codec, if (!strcmp(w->name, pin)) { pr_debug("dapm: %s: pin %s\n", codec->name, pin); w->connected = status; + /* Allow disabling of forced pins */ + if (status == 0) + w->force = 0; return 0; } } -- cgit v1.2.3 From 50ae8384cde9a67714ff03010493c5052690624e Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 7 May 2010 18:40:54 +0100 Subject: ASoC: Remove unused DAPM suspend flag We now manage suspend within the main power analysis rather than by flipping the state of widgets. Tested-by: Peter Ujfalusi Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- include/sound/soc-dapm.h | 1 - sound/soc/soc-dapm.c | 10 ---------- 2 files changed, 11 deletions(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h index d5d6ba862df..55c6d3d1894 100644 --- a/include/sound/soc-dapm.h +++ b/include/sound/soc-dapm.h @@ -427,7 +427,6 @@ struct snd_soc_dapm_widget { unsigned char connected:1; /* connected codec pin */ unsigned char new:1; /* cnew complete */ unsigned char ext:1; /* has external widgets */ - unsigned char suspend:1; /* was active before suspend */ unsigned char force:1; /* force state */ int (*power_check)(struct snd_soc_dapm_widget *w); diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 476dbe6daba..b30b0a255cd 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -2012,18 +2012,8 @@ int snd_soc_dapm_stream_event(struct snd_soc_codec *codec, w->active = 0; break; case SND_SOC_DAPM_STREAM_SUSPEND: - if (w->active) - w->suspend = 1; - w->active = 0; - break; case SND_SOC_DAPM_STREAM_RESUME: - if (w->suspend) { - w->active = 1; - w->suspend = 0; - } - break; case SND_SOC_DAPM_STREAM_PAUSE_PUSH: - break; case SND_SOC_DAPM_STREAM_PAUSE_RELEASE: break; } -- cgit v1.2.3 From 9949788b793826f2d19e929ac0219ad0e0891e2d Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 7 May 2010 20:24:05 +0100 Subject: ASoC: Refactor DAPM suspend handling Instead of using stream events to handle power down during suspend integrate the handling with the normal widget path checking by replacing all cases where we report a connected endpoint in a path with a function snd_soc_dapm_suspend_check() which looks at the ALSA power state for the card and reports false if we are in a D3 state. Since the core moves us into D3 prior to initating the suspend all power checks during suspend will cause the widgets to be powered down. In order to ensure that widgets are powered up on resume set the card to D2 at the start of resume handling (ALSA API calls require D0 so we are still protected against userspace access). Tested-by: Peter Ujfalusi Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- sound/soc/soc-core.c | 3 +++ sound/soc/soc-dapm.c | 53 +++++++++++++++++++++++++++++----------------------- 2 files changed, 33 insertions(+), 23 deletions(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 4079223203e..95739767ec4 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -963,6 +963,9 @@ static void soc_resume_deferred(struct work_struct *work) dev_dbg(socdev->dev, "starting resume work\n"); + /* Bring us up into D2 so that DAPM starts enabling things */ + snd_power_change_state(codec->card, SNDRV_CTL_POWER_D2); + if (card->resume_pre) card->resume_pre(pdev); diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index b30b0a255cd..8c8b291320a 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -430,6 +430,23 @@ static inline void dapm_clear_walk(struct snd_soc_codec *codec) p->walked = 0; } +/* We implement power down on suspend by checking the power state of + * the ALSA card - when we are suspending the ALSA state for the card + * is set to D3. + */ +static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget) +{ + struct snd_soc_codec *codec = widget->codec; + + switch (snd_power_get_state(codec->card)) { + case SNDRV_CTL_POWER_D3hot: + case SNDRV_CTL_POWER_D3cold: + return 0; + default: + return 1; + } +} + /* * Recursively check for a completed path to an active or physically connected * output widget. Returns number of complete paths. @@ -446,7 +463,7 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget) case snd_soc_dapm_adc: case snd_soc_dapm_aif_out: if (widget->active) - return 1; + return snd_soc_dapm_suspend_check(widget); default: break; } @@ -454,12 +471,12 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget) if (widget->connected) { /* connected pin ? */ if (widget->id == snd_soc_dapm_output && !widget->ext) - return 1; + return snd_soc_dapm_suspend_check(widget); /* connected jack or spk ? */ if (widget->id == snd_soc_dapm_hp || widget->id == snd_soc_dapm_spk || (widget->id == snd_soc_dapm_line && !list_empty(&widget->sources))) - return 1; + return snd_soc_dapm_suspend_check(widget); } list_for_each_entry(path, &widget->sinks, list_source) { @@ -492,7 +509,7 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget) case snd_soc_dapm_dac: case snd_soc_dapm_aif_in: if (widget->active) - return 1; + return snd_soc_dapm_suspend_check(widget); default: break; } @@ -500,16 +517,16 @@ static int is_connected_input_ep(struct snd_soc_dapm_widget *widget) if (widget->connected) { /* connected pin ? */ if (widget->id == snd_soc_dapm_input && !widget->ext) - return 1; + return snd_soc_dapm_suspend_check(widget); /* connected VMID/Bias for lower pops */ if (widget->id == snd_soc_dapm_vmid) - return 1; + return snd_soc_dapm_suspend_check(widget); /* connected jack ? */ if (widget->id == snd_soc_dapm_mic || (widget->id == snd_soc_dapm_line && !list_empty(&widget->sinks))) - return 1; + return snd_soc_dapm_suspend_check(widget); } list_for_each_entry(path, &widget->sources, list_sink) { @@ -897,22 +914,12 @@ static int dapm_power_widgets(struct snd_soc_codec *codec, int event) if (!w->power_check) continue; - /* If we're suspending then pull down all the - * power. */ - switch (event) { - case SND_SOC_DAPM_STREAM_SUSPEND: - power = 0; - break; - - default: - if (!w->force) - power = w->power_check(w); - else - power = 1; - if (power) - sys_power = 1; - break; - } + if (!w->force) + power = w->power_check(w); + else + power = 1; + if (power) + sys_power = 1; if (w->power == power) continue; -- cgit v1.2.3 From 1547aba993c990e5a316751431328145b38e1fea Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Fri, 7 May 2010 21:11:40 +0100 Subject: ASoC: Support leaving paths enabled over system suspend Some devices can usefully run audio while the Linux system is suspended. One of the most common examples is smartphone systems, which are normally designed to allow audio to be run between the baseband and the CODEC without passing through the CPU and so can suspend the CPU when on a voice call for additional power savings. Support such systems by providing an API snd_soc_dapm_ignore_suspend(). This can be used to mark DAPM endpoints as not being sensitive to system suspend. When the system is being suspended paths between endpoints which are marked as ignoring suspend will be kept active. Both source and sink must be marked, and there must already be an active path between the two endpoints prior to suspend. When paths are active over suspend the bias management will hold the device bias in the ON state. This is used to avoid suspending the CODEC while it is still in use. Tested-by: Peter Ujfalusi Acked-by: Liam Girdwood Signed-off-by: Mark Brown --- include/sound/soc-dapm.h | 2 ++ sound/soc/soc-core.c | 32 ++++++++++++++++++++++++++++---- sound/soc/soc-dapm.c | 31 ++++++++++++++++++++++++++++++- 3 files changed, 60 insertions(+), 5 deletions(-) (limited to 'sound/soc/soc-dapm.c') diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h index 55c6d3d1894..66ff4c124db 100644 --- a/include/sound/soc-dapm.h +++ b/include/sound/soc-dapm.h @@ -341,6 +341,7 @@ int snd_soc_dapm_get_pin_status(struct snd_soc_codec *codec, const char *pin); int snd_soc_dapm_sync(struct snd_soc_codec *codec); int snd_soc_dapm_force_enable_pin(struct snd_soc_codec *codec, const char *pin); +int snd_soc_dapm_ignore_suspend(struct snd_soc_codec *codec, const char *pin); /* dapm widget types */ enum snd_soc_dapm_type { @@ -428,6 +429,7 @@ struct snd_soc_dapm_widget { unsigned char new:1; /* cnew complete */ unsigned char ext:1; /* has external widgets */ unsigned char force:1; /* force state */ + unsigned char ignore_suspend:1; /* kept enabled over suspend */ int (*power_check)(struct snd_soc_dapm_widget *w); diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 95739767ec4..8661e5b4adb 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -927,8 +927,19 @@ static int soc_suspend(struct device *dev) SND_SOC_DAPM_STREAM_SUSPEND); } - if (codec_dev->suspend) - codec_dev->suspend(pdev, PMSG_SUSPEND); + /* If there are paths active then the CODEC will be held with + * bias _ON and should not be suspended. */ + if (codec_dev->suspend) { + switch (codec->bias_level) { + case SND_SOC_BIAS_STANDBY: + case SND_SOC_BIAS_OFF: + codec_dev->suspend(pdev, PMSG_SUSPEND); + break; + default: + dev_dbg(socdev->dev, "CODEC is on over suspend\n"); + break; + } + } for (i = 0; i < card->num_links; i++) { struct snd_soc_dai *cpu_dai = card->dai_link[i].cpu_dai; @@ -975,8 +986,21 @@ static void soc_resume_deferred(struct work_struct *work) cpu_dai->resume(cpu_dai); } - if (codec_dev->resume) - codec_dev->resume(pdev); + /* If the CODEC was idle over suspend then it will have been + * left with bias OFF or STANDBY and suspended so we must now + * resume. Otherwise the suspend was suppressed. + */ + if (codec_dev->resume) { + switch (codec->bias_level) { + case SND_SOC_BIAS_STANDBY: + case SND_SOC_BIAS_OFF: + codec_dev->resume(pdev); + break; + default: + dev_dbg(socdev->dev, "CODEC was on over suspend\n"); + break; + } + } for (i = 0; i < codec->num_dai; i++) { char *stream = codec->dai[i].playback.stream_name; diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c index 8c8b291320a..fefb6c44fc8 100644 --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -441,7 +441,9 @@ static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget) switch (snd_power_get_state(codec->card)) { case SNDRV_CTL_POWER_D3hot: case SNDRV_CTL_POWER_D3cold: - return 0; + if (widget->ignore_suspend) + pr_debug("%s ignoring suspend\n", widget->name); + return widget->ignore_suspend; default: return 1; } @@ -2136,6 +2138,33 @@ int snd_soc_dapm_get_pin_status(struct snd_soc_codec *codec, const char *pin) } EXPORT_SYMBOL_GPL(snd_soc_dapm_get_pin_status); +/** + * snd_soc_dapm_ignore_suspend - ignore suspend status for DAPM endpoint + * @codec: audio codec + * @pin: audio signal pin endpoint (or start point) + * + * Mark the given endpoint or pin as ignoring suspend. When the + * system is disabled a path between two endpoints flagged as ignoring + * suspend will not be disabled. The path must already be enabled via + * normal means at suspend time, it will not be turned on if it was not + * already enabled. + */ +int snd_soc_dapm_ignore_suspend(struct snd_soc_codec *codec, const char *pin) +{ + struct snd_soc_dapm_widget *w; + + list_for_each_entry(w, &codec->dapm_widgets, list) { + if (!strcmp(w->name, pin)) { + w->ignore_suspend = 1; + return 0; + } + } + + pr_err("Unknown DAPM pin: %s\n", pin); + return -EINVAL; +} +EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend); + /** * snd_soc_dapm_free - free dapm resources * @socdev: SoC device -- cgit v1.2.3