Re: [RESEND PATCH v3 02/10] spmi: pmic-arb: do not ack and clear peripheral interrupts in cleanup_irq

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On 02/12/2021 00:00, Fenglin Wu wrote:
From: Subbaraman Narayanamurthy <subbaram@xxxxxxxxxxxxxx>

Currently, cleanup_irq() is invoked when a peripheral's interrupt
fires and there is no mapping present in the interrupt domain of
spmi interrupt controller.

The cleanup_irq clears the arbiter bit, clears the pmic interrupt
and disables it at the pmic in that order. The last disable in
cleanup_irq races with request_irq() in that it stomps over the
enable issued by request_irq. Fix this by not writing to the pmic
in cleanup_irq. The latched bit will be left set in the pmic,
which will not send us more interrupts even if the enable bit
stays enabled.

When a client wants to request an interrupt, use the activate
callback on the irq_domain to clear latched bit. This ensures
that the latched, if set due to the above changes in cleanup_irq
or when the bootloader leaves it set, gets cleaned up, paving way
for upcoming interrupts to trigger.

With this, there is a possibility of unwanted triggering of
interrupt right after the latched bit is cleared - the interrupt
may be left enabled too. To avoid that, clear the enable first
followed by clearing the latched bit in the activate callback.

Signed-off-by: Subbaraman Narayanamurthy <subbaram@xxxxxxxxxxxxxx>
[collinsd@xxxxxxxxxxxxxx: fix merge conflict]
Signed-off-by: David Collins <collinsd@xxxxxxxxxxxxxx>
Signed-off-by: Fenglin Wu <quic_fenglinw@xxxxxxxxxxx>
---
  drivers/spmi/spmi-pmic-arb.c | 15 +++++----------
  1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index da629cc..ce7ae99 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -492,16 +492,6 @@ static void cleanup_irq(struct spmi_pmic_arb *pmic_arb, u16 apid, int 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,
-			(per << 8) + QPNPINT_REG_LATCHED_CLR, &irq_mask, 1))
-		dev_err_ratelimited(&pmic_arb->spmic->dev, "failed to ack irq_mask = 0x%x for ppid = %x\n",
-				irq_mask, ppid);spmi: pmic-arb: cleanup unrequested irqs
-
-	if (pmic_arb_write_cmd(pmic_arb->spmic, SPMI_CMD_EXT_WRITEL, sid,
-			       (per << 8) + QPNPINT_REG_EN_CLR, &irq_mask, 1))
-		dev_err_ratelimited(&pmic_arb->spmic->dev, "failed to ack irq_mask = 0x%x for ppid = %x\n",
-				irq_mask, ppid);
  }
static int periph_interrupt(struct spmi_pmic_arb *pmic_arb, u16 apid)
@@ -674,6 +664,7 @@ static int qpnpint_irq_domain_activate(struct irq_domain *domain,
  	u16 apid = hwirq_to_apid(d->hwirq);
  	u16 sid = hwirq_to_sid(d->hwirq);
  	u16 irq = hwirq_to_irq(d->hwirq);
+	u8 buf;
if (pmic_arb->apid_data[apid].irq_ee != pmic_arb->ee) {
  		dev_err(&pmic_arb->spmic->dev, "failed to xlate sid = %#x, periph = %#x, irq = %u: ee=%u but owner=%u\n",
@@ -682,6 +673,10 @@ static int qpnpint_irq_domain_activate(struct irq_domain *domain,
  		return -ENODEV;
  	}
+ buf = BIT(irq);
+	qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &buf, 1);
+	qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &buf, 1);
+
  	return 0;
  }

Shouldn't this have a

Fixes: 6bc546e71e50 ("spmi: pmic-arb: cleanup unrequested irqs")
Fixes: 02abec3616c1 ("spmi: pmic-arb: rename pa_xx to pmic_arb_xx and other cleanup")

so we know to backport as necessary

---
bod




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