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spmi: pmic-arb: do not ack and clear peripheral interrupts in cleanup_irq

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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.

Fixes: 6bc546e71e ("spmi: pmic-arb: cleanup unrequested irqs")
Fixes: 02abec3616 ("spmi: pmic-arb: rename pa_xx to pmic_arb_xx and other cleanup")
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
[collinsd@codeaurora.org: fix merge conflict]
Signed-off-by: David Collins <collinsd@codeaurora.org>
Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
Link: https://lore.kernel.org/r/1655004286-11493-4-git-send-email-quic_fenglinw@quicinc.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20220930005019.2663064-5-sboyd@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Subbaraman Narayanamurthy 2022-09-29 17:50:13 -07:00 committed by Greg Kroah-Hartman
parent abb9088b3a
commit b6c1761721
1 changed files with 5 additions and 10 deletions
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15
drivers/spmi/spmi-pmic-arb.c
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@ -593,16 +593,6 @@ 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);
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)
@ -780,6 +770,7 @@ 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",
@ -788,6 +779,10 @@ 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;
}