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Subject[PATCH 06/11] spmi: pmic-arb: fix missing interrupts
Date
From: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

irq_enable is called when the device resumes. Note that the
irq_enable is called regardless of whether the interrupt was
marked enabled/disabled in the descriptor or whether it was
masked/unmasked at the controller while resuming.

The current driver unconditionally clears the interrupt in its
irq_enable callback. This is dangerous as any interrupts that
happen right before the resume could be missed.
Remove the irq_enable callback and use mask/unmask instead.

Also remove struct pmic_arb_irq_spec as it serves no real purpose.
It is used only in the translate function and the code is much
cleaner without it.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
drivers/spmi/spmi-pmic-arb.c | 29 +++--------------------------
1 file changed, 3 insertions(+), 26 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 0a5728c..bc03737 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -588,17 +588,6 @@ static void qpnpint_irq_unmask(struct irq_data *d)
qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1);
}

-static void qpnpint_irq_enable(struct irq_data *d)
-{
- u8 irq = d->hwirq >> 8;
- u8 data;
-
- qpnpint_irq_unmask(d);
-
- data = BIT(irq);
- qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1);
-}
-
static int qpnpint_irq_set_type(struct irq_data *d, unsigned int flow_type)
{
struct spmi_pmic_arb_qpnpint_type type;
@@ -647,7 +636,6 @@ static int qpnpint_get_irqchip_state(struct irq_data *d,

static struct irq_chip pmic_arb_irqchip = {
.name = "pmic_arb",
- .irq_enable = qpnpint_irq_enable,
.irq_ack = qpnpint_irq_ack,
.irq_mask = qpnpint_irq_mask,
.irq_unmask = qpnpint_irq_unmask,
@@ -657,12 +645,6 @@ static int qpnpint_get_irqchip_state(struct irq_data *d,
| IRQCHIP_SKIP_SET_WAKE,
};

-struct spmi_pmic_arb_irq_spec {
- unsigned slave:4;
- unsigned per:8;
- unsigned irq:3;
-};
-
static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
struct device_node *controller,
const u32 *intspec,
@@ -671,7 +653,6 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
unsigned int *out_type)
{
struct spmi_pmic_arb *pa = d->host_data;
- struct spmi_pmic_arb_irq_spec spec;
int rc;
u8 apid;

@@ -686,10 +667,6 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
if (intspec[0] > 0xF || intspec[1] > 0xFF || intspec[2] > 0x7)
return -EINVAL;

- spec.slave = intspec[0];
- spec.per = intspec[1];
- spec.irq = intspec[2];
-
rc = pa->ver_ops->ppid_to_apid(pa, intspec[0],
(intspec[1] << 8), &apid);
if (rc < 0) {
@@ -705,9 +682,9 @@ static int qpnpint_irq_domain_dt_translate(struct irq_domain *d,
if (apid < pa->min_apid)
pa->min_apid = apid;

- *out_hwirq = spec.slave << 24
- | spec.per << 16
- | spec.irq << 8
+ *out_hwirq = (intspec[0] & 0xF) << 24
+ | (intspec[1] & 0xFF) << 16
+ | (intspec[2] & 0x7) << 8
| apid;
*out_type = intspec[3] & IRQ_TYPE_SENSE_MASK;

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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