[PATCH v1 1/2] ALSA: hda: cs35l41: Ignore errors when configuring IRQs

[Stefan Binding <sbinding@opensource.cirrus.com>]

IRQs used for CS35L41 HDA are used to detect and attempt to recover
from errors. Without these interrupts, the driver should behave as
normal.

For laptops which contain a bad configuration for the interrupt in the
BIOS, the current behaviour of failing when trying to configure the
interrupt means the probe fails, and audio is broken.

It is better for the user experience if the driver instead warns that
no interrupt is configured rather than simply failing.
The drawback is that if an error occurs without the interrupt, we
firstly would not be able to trace the issue, and secondly would not
be able to attempt to recover from the issue, but this is better than
failing immediately.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
---
 sound/pci/hda/cs35l41_hda.c | 69 +++++++++++++++++++++++++------------
 1 file changed, 47 insertions(+), 22 deletions(-)

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index 74076fa45dd6..6c49e5c6cd20 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -1594,13 +1594,56 @@ static struct regmap_irq_chip cs35l41_regmap_irq_chip = {
 	.runtime_pm = true,
 };
 
+static void cs35l41_configure_interrupt(struct cs35l41_hda *cs35l41, int irq_pol)
+{
+	int irq;
+	int ret;
+	int i;
+
+	if (!cs35l41->irq) {
+		dev_warn(cs35l41->dev, "No Interrupt Found");
+		goto err;
+	}
+
+	ret = devm_regmap_add_irq_chip(cs35l41->dev, cs35l41->regmap, cs35l41->irq,
+					IRQF_ONESHOT | IRQF_SHARED | irq_pol,
+					0, &cs35l41_regmap_irq_chip, &cs35l41->irq_data);
+	if (ret) {
+		dev_dbg(cs35l41->dev, "Unable to add IRQ Chip: %d.", ret);
+		goto err;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(cs35l41_irqs); i++) {
+		irq = regmap_irq_get_virq(cs35l41->irq_data, cs35l41_irqs[i].irq);
+		if (irq < 0) {
+			ret = irq;
+			dev_dbg(cs35l41->dev, "Unable to map IRQ %s: %d.", cs35l41_irqs[i].name,
+				ret);
+			goto err;
+		}
+
+		ret = devm_request_threaded_irq(cs35l41->dev, irq, NULL,
+						cs35l41_irqs[i].handler,
+						IRQF_ONESHOT | IRQF_SHARED | irq_pol,
+						cs35l41_irqs[i].name, cs35l41);
+		if (ret) {
+			dev_dbg(cs35l41->dev, "Unable to allocate IRQ %s:: %d.",
+				cs35l41_irqs[i].name, ret);
+			goto err;
+		}
+	}
+	return;
+err:
+	dev_warn(cs35l41->dev,
+		 "IRQ Config Failed. Amp errors may not be recoverable without reboot.");
+}
+
 static int cs35l41_hda_apply_properties(struct cs35l41_hda *cs35l41)
 {
 	struct cs35l41_hw_cfg *hw_cfg = &cs35l41->hw_cfg;
 	bool using_irq = false;
-	int irq, irq_pol;
+	int irq_pol;
 	int ret;
-	int i;
 
 	if (!cs35l41->hw_cfg.valid)
 		return -EINVAL;
@@ -1643,26 +1686,8 @@ static int cs35l41_hda_apply_properties(struct cs35l41_hda *cs35l41)
 
 	irq_pol = cs35l41_gpio_config(cs35l41->regmap, hw_cfg);
 
-	if (cs35l41->irq && using_irq) {
-		ret = devm_regmap_add_irq_chip(cs35l41->dev, cs35l41->regmap, cs35l41->irq,
-					       IRQF_ONESHOT | IRQF_SHARED | irq_pol,
-					       0, &cs35l41_regmap_irq_chip, &cs35l41->irq_data);
-		if (ret)
-			return ret;
-
-		for (i = 0; i < ARRAY_SIZE(cs35l41_irqs); i++) {
-			irq = regmap_irq_get_virq(cs35l41->irq_data, cs35l41_irqs[i].irq);
-			if (irq < 0)
-				return irq;
-
-			ret = devm_request_threaded_irq(cs35l41->dev, irq, NULL,
-							cs35l41_irqs[i].handler,
-							IRQF_ONESHOT | IRQF_SHARED | irq_pol,
-							cs35l41_irqs[i].name, cs35l41);
-			if (ret)
-				return ret;
-		}
-	}
+	if (using_irq)
+		cs35l41_configure_interrupt(cs35l41, irq_pol);
 
 	return cs35l41_hda_channel_map(cs35l41->dev, 0, NULL, 1, &hw_cfg->spk_pos);
 }
-- 
2.34.1