diff options
| -rw-r--r-- | sound/soc/codecs/rt5677.c | 71 |
1 files changed, 45 insertions, 26 deletions
diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c index b5ae61ff87af..202af7135f07 100644 --- a/sound/soc/codecs/rt5677.c +++ b/sound/soc/codecs/rt5677.c @@ -5072,38 +5072,57 @@ static const struct rt5677_irq_desc rt5677_irq_descs[] = { static irqreturn_t rt5677_irq(int unused, void *data) { struct rt5677_priv *rt5677 = data; - int ret = 0, i, reg_irq, virq; + int ret = 0, loop, i, reg_irq, virq; bool irq_fired = false; mutex_lock(&rt5677->irq_lock); - /* Read interrupt status */ - ret = regmap_read(rt5677->regmap, RT5677_IRQ_CTRL1, ®_irq); - if (ret) { - dev_err(rt5677->dev, "failed reading IRQ status: %d\n", ret); - goto exit; - } - for (i = 0; i < RT5677_IRQ_NUM; i++) { - if (reg_irq & rt5677_irq_descs[i].status_mask) { - irq_fired = true; - virq = irq_find_mapping(rt5677->domain, i); - if (virq) - handle_nested_irq(virq); - - /* Clear the interrupt by flipping the polarity of the - * interrupt source line that fired - */ - reg_irq ^= rt5677_irq_descs[i].polarity_mask; + /* + * Loop to handle interrupts until the last i2c read shows no pending + * irqs. The interrupt line is shared by multiple interrupt sources. + * After the regmap_read() below, a new interrupt source line may + * become high before the regmap_write() finishes, so there isn't a + * rising edge on the shared interrupt line for the new interrupt. Thus, + * the loop is needed to avoid missing irqs. + * + * A safeguard of 20 loops is used to avoid hanging in the irq handler + * if there is something wrong with the interrupt status update. The + * interrupt sources here are audio jack plug/unplug events which + * shouldn't happen at a high frequency for a long period of time. + * Empirically, more than 3 loops have never been seen. + */ + for (loop = 0; loop < 20; loop++) { + /* Read interrupt status */ + ret = regmap_read(rt5677->regmap, RT5677_IRQ_CTRL1, ®_irq); + if (ret) { + dev_err(rt5677->dev, "failed reading IRQ status: %d\n", + ret); + goto exit; } - } - if (!irq_fired) - goto exit; - - ret = regmap_write(rt5677->regmap, RT5677_IRQ_CTRL1, reg_irq); - if (ret) { - dev_err(rt5677->dev, "failed updating IRQ status: %d\n", ret); - goto exit; + irq_fired = false; + for (i = 0; i < RT5677_IRQ_NUM; i++) { + if (reg_irq & rt5677_irq_descs[i].status_mask) { + irq_fired = true; + virq = irq_find_mapping(rt5677->domain, i); + if (virq) + handle_nested_irq(virq); + + /* Clear the interrupt by flipping the polarity + * of the interrupt source line that fired + */ + reg_irq ^= rt5677_irq_descs[i].polarity_mask; + } + } + if (!irq_fired) + goto exit; + + ret = regmap_write(rt5677->regmap, RT5677_IRQ_CTRL1, reg_irq); + if (ret) { + dev_err(rt5677->dev, "failed updating IRQ status: %d\n", + ret); + goto exit; + } } exit: mutex_unlock(&rt5677->irq_lock); |