From: Ben Zhang <benzh@xxxxxxxxxxxx>
Before a hotword is detected, GPIO1 pin is configured as IRQ
output so that jack detect works. When a hotword is detected,
the DSP firmware configures the GPIO1 pin as GPIO1 and
drives a 1. rt5677_irq() is called after a rising edge on
the GPIO1 pin, due to either jack detect event or hotword
event, or both. All possible events are checked and handled
in rt5677_irq() where GPIO1 pin is configured back to IRQ
output if a hotword is detected.
Signed-off-by: Ben Zhang <benzh@xxxxxxxxxxxx>
Signed-off-by: Curtis Malainey <cujomalainey@xxxxxxxxxxxx>
---
sound/soc/codecs/rt5677.c | 64 +++++++++++++++++++++++++++++----------
1 file changed, 48 insertions(+), 16 deletions(-)
diff --git a/sound/soc/codecs/rt5677.c b/sound/soc/codecs/rt5677.c
index 13f21bf4e04ec..48955b22262fa 100644
--- a/sound/soc/codecs/rt5677.c
+++ b/sound/soc/codecs/rt5677.c
@@ -312,6 +312,8 @@ static bool rt5677_volatile_register(struct device *dev, unsigned int reg)
case RT5677_IRQ_CTRL1:
case RT5677_IRQ_CTRL2:
case RT5677_GPIO_ST:
+ case RT5677_GPIO_CTRL1: /* Modified by DSP firmware */
+ case RT5677_GPIO_CTRL2: /* Modified by DSP firmware */
case RT5677_DSP_INB1_SRC_CTRL4:
case RT5677_DSP_INB2_SRC_CTRL4:
case RT5677_DSP_INB3_SRC_CTRL4:
@@ -746,8 +748,11 @@ static unsigned int rt5677_set_vad_source(struct rt5677_priv *rt5677)
RT5677_VAD_BUF_OW | RT5677_VAD_FG2ENC |
RT5677_VAD_ADPCM_BYPASS | 1 << RT5677_VAD_MIN_DUR_SFT);
- /* IRQ Source of VAD Jack Detection = enable */
- regmap_write(rt5677->regmap, RT5677_IRQ_CTRL2, 0x4000);
+ /* VAD/SAD is not routed to the IRQ output (i.e. MX-BE[14] = 0), but it
+ * is routed to DSP_IRQ_0, so DSP firmware may use it to sleep and save
+ * power. See ALC5677 datasheet section 9.17 "GPIO, Interrupt and Jack
+ * Detection" for more info.
+ */
/* Private register, no doc */
regmap_update_bits(rt5677->regmap, RT5677_PR_BASE + RT5677_BIAS_CUR4,
@@ -886,15 +891,15 @@ static void rt5677_dsp_work(struct work_struct *work)
if (enable && !activity) {
activity = true;
- /* Set GPIO1 as an output pin driving a 0. Firmware will
- * raise GPIO1 upon hotword detect.
+ /* Before a hotword is detected, GPIO1 pin is configured as IRQ
+ * output so that jack detect works. When a hotword is detected,
+ * the DSP firmware configures the GPIO1 pin as GPIO1 and
+ * drives a 1. rt5677_irq() is called after a rising edge on
+ * the GPIO1 pin, due to either jack detect event or hotword
+ * event, or both. All possible events are checked and handled
+ * in rt5677_irq() where GPIO1 pin is configured back to IRQ
+ * output if a hotword is detected.
*/
- regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL2,
- RT5677_GPIO1_DIR_MASK | RT5677_GPIO1_OUT_MASK |
- RT5677_GPIO1_P_MASK, RT5677_GPIO1_DIR_OUT |
- RT5677_GPIO1_OUT_LO | RT5677_GPIO1_P_NOR);
- regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1,
- RT5677_GPIO1_PIN_MASK, RT5677_GPIO1_PIN_GPIO1);
rt5677_set_vad_source(rt5677);
rt5677_set_dsp_mode(rt5677, true);
@@ -915,6 +920,8 @@ static void rt5677_dsp_work(struct work_struct *work)
} else if (!enable && activity) {
activity = false;
+ /* Don't turn off the DSP while handling irqs */
+ mutex_lock(&rt5677->irq_lock);
/* Set DSP CPU to Stop */
regmap_update_bits(rt5677->regmap, RT5677_PWR_DSP1,
RT5677_PWR_DSP_CPU, RT5677_PWR_DSP_CPU);
@@ -923,13 +930,12 @@ static void rt5677_dsp_work(struct work_struct *work)
/* Disable and clear VAD interrupt */
regmap_write(rt5677->regmap, RT5677_VAD_CTRL1, 0x2184);
- regmap_update_bits(rt5677->regmap, RT5677_IRQ_CTRL2,
- 0xF000, 0x0000);
/* Set GPIO1 pin back to be IRQ output for jack detect */
regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1,
RT5677_GPIO1_PIN_MASK, RT5677_GPIO1_PIN_IRQ);
+ mutex_unlock(&rt5677->irq_lock);
}
}
@@ -5237,6 +5243,28 @@ static const struct rt5677_irq_desc rt5677_irq_descs[] = {
},
};
+bool rt5677_check_hotword(struct rt5677_priv *rt5677)
+{
+ int reg_gpio;
+
+ if (!rt5677->is_dsp_mode)
+ return false;
+
+ if (regmap_read(rt5677->regmap, RT5677_GPIO_CTRL1, ®_gpio))
+ return false;
+
+ /* Firmware sets GPIO1 pin to be GPIO1 after hotword is detected */
+ if ((reg_gpio & RT5677_GPIO1_PIN_MASK) == RT5677_GPIO1_PIN_IRQ)
+ return false;
+
+ /* Set GPIO1 pin back to be IRQ output for jack detect */
+ regmap_update_bits(rt5677->regmap, RT5677_GPIO_CTRL1,
+ RT5677_GPIO1_PIN_MASK, RT5677_GPIO1_PIN_IRQ);
+
+ rt5677_spi_hotword_detected();
+ return true;
+}
+
static irqreturn_t rt5677_irq(int unused, void *data)
{
struct rt5677_priv *rt5677 = data;
@@ -5245,9 +5273,6 @@ static irqreturn_t rt5677_irq(int unused, void *data)
mutex_lock(&rt5677->irq_lock);
- if (rt5677->dsp_vad_en)
- rt5677_spi_hotword_detected();
-
/*
* Loop to handle interrupts until the last i2c read shows no pending
* irqs. The interrupt line is shared by multiple interrupt sources.
@@ -5285,7 +5310,13 @@ static irqreturn_t rt5677_irq(int unused, void *data)
reg_irq ^= rt5677_irq_descs[i].polarity_mask;
}
}
- if (!irq_fired)
+
+ /* Exit the loop only when we know for sure that GPIO1 pin
+ * was low at some point since irq_lock was acquired. Any event
+ * after that point creates a rising edge that triggers another
+ * call to rt5677_irq().
+ */
+ if (!irq_fired && !rt5677_check_hotword(rt5677))
goto exit;
ret = regmap_write(rt5677->regmap, RT5677_IRQ_CTRL1, reg_irq);
@@ -5296,6 +5327,7 @@ static irqreturn_t rt5677_irq(int unused, void *data)
}
}
exit:
+ WARN_ON_ONCE(loop == 20);
mutex_unlock(&rt5677->irq_lock);
if (irq_fired)
return IRQ_HANDLED;
--
2.23.0.866.gb869b98d4c-goog
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