[PATCH v3 01/10] spmi: pmic-arb: handle spurious interrupt

[Fenglin Wu]

From: Abhijeet Dharmapurikar <adharmap@xxxxxxxxxxxxxx>

Call handle_bad_irq() for handling spurious interrupt. While at it,
add an error print in cleanup_irq() for any spurious interrupt which
is fired but not having interrupt handler registered.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@xxxxxxxxxxxxxx>
Signed-off-by: David Collins <collinsd@xxxxxxxxxxxxxx>
Signed-off-by: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>
---
 drivers/spmi/spmi-pmic-arb.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index bbbd311..da629cc 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -489,6 +489,8 @@ static void cleanup_irq(struct spmi_pmic_arb *pmic_arb, u16 apid, int id)
 	u8 per = ppid & 0xFF;
 	u8 irq_mask = BIT(id);
 
+	dev_err_ratelimited(&pmic_arb->spmic->dev, "%s apid=%d sid=0x%x per=0x%x irq=%d\n",
+			__func__, apid, sid, per, id);
 	writel_relaxed(irq_mask, pmic_arb->ver_ops->irq_clear(pmic_arb, apid));
 
 	if (pmic_arb_write_cmd(pmic_arb->spmic, SPMI_CMD_EXT_WRITEL, sid,
@@ -502,10 +504,10 @@ static void cleanup_irq(struct spmi_pmic_arb *pmic_arb, u16 apid, int id)
 				irq_mask, ppid);
 }
 
-static void periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
+static int periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
 {
 	unsigned int irq;
-	u32 status, id;
+	u32 status, id, handled = 0;
 	u8 sid = (pmic_arb->apid_data[apid].ppid >> 8) & 0xF;
 	u8 per = pmic_arb->apid_data[apid].ppid & 0xFF;
 
@@ -520,7 +522,10 @@ static void periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
 			continue;
 		}
 		generic_handle_irq(irq);
+		handled++;
 	}
+
+	return (handled) ? 0 : -EINVAL;
 }
 
 static void pmic_arb_chained_irq(struct irq_desc *desc)
@@ -531,7 +536,7 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 	int first = pmic_arb->min_apid >> 5;
 	int last = pmic_arb->max_apid >> 5;
 	u8 ee = pmic_arb->ee;
-	u32 status, enable;
+	u32 status, enable, handled = 0;
 	int i, id, apid;
 
 	chained_irq_enter(chip, desc);
@@ -546,10 +551,14 @@ static void pmic_arb_chained_irq(struct irq_desc *desc)
 			enable = readl_relaxed(
 					ver_ops->acc_enable(pmic_arb, apid));
 			if (enable & SPMI_PIC_ACC_ENABLE_BIT)
-				periph_interrupt(pmic_arb, apid);
+				if (periph_interrupt(pmic_arb, apid) == 0)
+					handled++;
 		}
 	}
 
+	if (handled == 0)
+		handle_bad_irq(desc);
+
 	chained_irq_exit(chip, desc);
 }
 
-- 
2.7.4