On Mon, Aug 27 2018 at 16:35 -0600, Matthias Kaehlcke wrote:
Hi Lina,
On Fri, Aug 24, 2018 at 02:01:53PM -0600, Lina Iyer wrote:
QCOM SoC's that have Power Domain Controller (PDC) chip in the always-on
domain can wakeup the SoC, when interrupts and GPIOs are routed to the
its interrupt controller. Only select GPIOs that are deemed wakeup
wording nit: "are routed to the|its interrupt controller"
Okay.
capable are routed to specific PDC pins. During low power state, the
pinmux interrupt controller may be non-functional but the PDC would be.
The PDC can detect the wakeup GPIO is triggered and bring the TLMM to an
operational state.
Interrupts that are level triggered will be detected at the TLMM when
the controller becomes operational. Edge interrupts however need to be
replayed again.
Request the corresponding PDC IRQ, when the GPIO is requested as an IRQ,
but keep it disabled. During suspend, we can enable the PDC IRQ instead
of the GPIO IRQ, which may or not be detected.
Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
---
Changes in v2:
- Remove IRQF_NO_SUSPEND and IRQF_ONE_SHOT from PDC IRQ
Changes in v1:
- Trigger GPIO in h/w from PDC IRQ handler
- Avoid big tables for GPIO-PDC map, pick from DT instead
- Use handler_data
---
drivers/pinctrl/qcom/pinctrl-msm.c | 96 ++++++++++++++++++++++++++++++
1 file changed, 96 insertions(+)
diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
index 0e22f52b2a19..b675ea56a4ff 100644
--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -687,11 +687,15 @@ static int msm_gpio_irq_set_type(struct irq_data *d, unsigned int type)
const struct msm_pingroup *g;
unsigned long flags;
u32 val;
+ struct irq_data *pdc_irqd = irq_get_handler_data(d->irq);
g = &pctrl->soc->groups[d->hwirq];
raw_spin_lock_irqsave(&pctrl->lock, flags);
+ if (pdc_irqd)
+ irq_set_irq_type(pdc_irqd->irq, type);
+
/*
* For hw without possibility of detecting both edges
*/
@@ -779,9 +783,13 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
unsigned long flags;
+ struct irq_data *pdc_irqd = irq_get_handler_data(d->irq);
raw_spin_lock_irqsave(&pctrl->lock, flags);
+ if (pdc_irqd)
+ irq_set_irq_wake(pdc_irqd->irq, on);
+
irq_set_irq_wake(pctrl->irq, on);
raw_spin_unlock_irqrestore(&pctrl->lock, flags);
@@ -863,6 +871,92 @@ static bool msm_gpio_needs_valid_mask(struct msm_pinctrl *pctrl)
return device_property_read_u16_array(pctrl->dev, "gpios", NULL, 0) > 0;
}
+static irqreturn_t wake_irq_gpio_handler(int irq, void *data)
+{
+ struct irq_data *irqd = data;
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(irqd);
+ struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
+ const struct msm_pingroup *g;
+ unsigned long flags;
+ u32 val;
+
+ if (!irqd_is_level_type(irqd)) {
+ g = &pctrl->soc->groups[irqd->hwirq];
+ raw_spin_lock_irqsave(&pctrl->lock, flags);
+ val = BIT(g->intr_status_bit);
+ writel(val, pctrl->regs + g->intr_status_reg);
+ raw_spin_unlock_irqrestore(&pctrl->lock, flags);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int msm_gpio_pdc_pin_request(struct irq_data *d)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
+ struct platform_device *pdev = to_platform_device(pctrl->dev);
+ const char *pin_name;
+ int irq;
+ int ret;
+
+ pin_name = kasprintf(GFP_KERNEL, "gpio%lu", d->hwirq);
+ if (!pin_name)
+ return -ENOMEM;
+
+ irq = platform_get_irq_byname(pdev, pin_name);
+ if (irq < 0) {
+ kfree(pin_name);
+ return 0;
Do I understand correctly that this is the case where the pin isn't
routed to the PDC?
Yes, correct.
+ }
+
+ ret = request_irq(irq, wake_irq_gpio_handler, irqd_get_trigger_type(d),
+ pin_name, d);
+ if (ret) {
+ pr_warn("GPIO-%lu could not be set up as wakeup", d->hwirq);
'\n' is missing
ok.
+ kfree(pin_name);
+ return ret;
+ }
+
+ irq_set_handler_data(d->irq, irq_get_irq_data(irq));
+ disable_irq(irq);
+
+ return 0;
+}
+
+static int msm_gpio_pdc_pin_release(struct irq_data *d)
+{
+ struct irq_data *pdc_irqd = irq_get_handler_data(d->irq);
+
+ if (pdc_irqd) {
+ irq_set_handler_data(d->irq, NULL);
+ free_irq(pdc_irqd->irq, d);
You need to free 'pin_name' allocated in msm_gpio_pdc_pin_request().
IIUC it should be available in irq_desc->action->name.
Yes, I didn't realize that free_irq returns the name when I posted this
series (noted in the cover letter). Will fix.
-- Lina
