From: Ben Zhang benzh@chromium.org
The irq is disabled at suspend to avoid running the threaded irq handler after the codec has been powered off. At resume, codec irq is re-enabled and the interrupt status register is checked to see if headphone has been pluggnd/unplugged while the device is suspended.
There is still a chance that the headphone gets enabled or disabled after the codec is suspended. disable_irq syncs the threaded irq handler, but soc-jack's threaded irq handler schedules a delayed work to poll gpios (for debounce). This is still OK. The codec won't be powered back on again because all audio paths have been suspended, and there are no force enabled supply widgets (MICBIAS1 is disabled). The gpio status read after codec power off could be wrong, so the gpio values are checked again after resume.
Signed-off-by: Ben Zhang benzh@chromium.org Signed-off-by: Curtis Malainey cujomalainey@chromium.org --- sound/soc/codecs/rt5677.c | 46 +++++++++++++++++++++++++++++++++++++++ sound/soc/codecs/rt5677.h | 2 ++ 2 files changed, 48 insertions(+)
diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c index 098dcbaa4539..a262a3dfbe2b 100644 --- a/sound/soc/codecs/rt5677.c +++ b/sound/soc/codecs/rt5677.c @@ -4993,6 +4993,11 @@ static int rt5677_suspend(struct snd_soc_component *component) { struct rt5677_priv *rt5677 = snd_soc_component_get_drvdata(component);
+ if (rt5677->irq) { + cancel_delayed_work_sync(&rt5677->resume_irq_check); + disable_irq(rt5677->irq); + } + if (!rt5677->dsp_vad_en) { regcache_cache_only(rt5677->regmap, true); regcache_mark_dirty(rt5677->regmap); @@ -5021,6 +5026,11 @@ static int rt5677_resume(struct snd_soc_component *component) regcache_sync(rt5677->regmap); }
+ if (rt5677->irq) { + enable_irq(rt5677->irq); + schedule_delayed_work(&rt5677->resume_irq_check, 0); + } + return 0; } #else @@ -5419,6 +5429,39 @@ static irqreturn_t rt5677_irq(int unused, void *data) return IRQ_NONE; }
+static void rt5677_resume_irq_check(struct work_struct *work) +{ + int i, virq; + struct rt5677_priv *rt5677 = + container_of(work, struct rt5677_priv, resume_irq_check.work); + + /* This is needed to check and clear the interrupt status register + * at resume. If the headset is plugged/unplugged when the device is + * fully suspended, there won't be a rising edge at resume to trigger + * the interrupt. Without this, we miss the next unplug/plug event. + */ + rt5677_irq(0, rt5677); + + /* Call all enabled jack detect irq handlers again. This is needed in + * addition to the above check for a corner case caused by jack gpio + * debounce. After codec irq is disabled at suspend, the delayed work + * scheduled by soc-jack may run and read wrong jack gpio values, since + * the regmap is in cache only mode. At resume, there is no irq because + * rt5677_irq has already ran and cleared the irq status at suspend. + * Without this explicit check, unplug the headset right after suspend + * starts, then after resume the headset is still shown as plugged in. + */ + mutex_lock(&rt5677->irq_lock); + for (i = 0; i < RT5677_IRQ_NUM; i++) { + if (rt5677->irq_en & rt5677_irq_descs[i].enable_mask) { + virq = irq_find_mapping(rt5677->domain, i); + if (virq) + handle_nested_irq(virq); + } + } + mutex_unlock(&rt5677->irq_lock); +} + static void rt5677_irq_bus_lock(struct irq_data *data) { struct rt5677_priv *rt5677 = irq_data_get_irq_chip_data(data); @@ -5494,6 +5537,7 @@ static int rt5677_init_irq(struct i2c_client *i2c) }
mutex_init(&rt5677->irq_lock); + INIT_DELAYED_WORK(&rt5677->resume_irq_check, rt5677_resume_irq_check);
/* * Select RC as the debounce clock so that GPIO works even when @@ -5539,6 +5583,8 @@ static int rt5677_init_irq(struct i2c_client *i2c) if (ret) dev_err(&i2c->dev, "Failed to request IRQ: %d\n", ret);
+ rt5677->irq = i2c->irq; + return ret; }
diff --git a/sound/soc/codecs/rt5677.h b/sound/soc/codecs/rt5677.h index 046ed2ee8e31..f8ada967fdbc 100644 --- a/sound/soc/codecs/rt5677.h +++ b/sound/soc/codecs/rt5677.h @@ -1856,6 +1856,8 @@ struct rt5677_priv { struct irq_domain *domain; struct mutex irq_lock; unsigned int irq_en; + struct delayed_work resume_irq_check; + int irq;
int (*set_dsp_vad)(struct snd_soc_component *component, bool on); };