On Sun, Aug 26 2018 at 08:33 -0600, Linus Walleij wrote:
On Fri, Aug 17, 2018 at 6:39 PM Lina Iyer <il...@codeaurora.org> 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 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 <il...@codeaurora.org> --- 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_dataJust for the record this is an impressive and much needed patch set, no other SoC developer has yet taken on the task of making this work so I very much appreciate that Qualcomm show the way.+static int msm_gpio_pdc_pin_request(struct irq_data *d) +static int msm_gpio_pdc_pin_release(struct irq_data *d) +static int msm_gpio_irq_reqres(struct irq_data *d) +{(...)+ if (gpiochip_lock_as_irq(gc, irqd_to_hwirq(d))) {(...)+static void msm_gpio_irq_relres(struct irq_data *d) +{ + gpiochip_unlock_as_irq(gc, irqd_to_hwirq(d)); +}FYI Hans Verkuil is working on a patch set that moves the lock/unlock as IRQ call to the irqchip request() and release() functions so we can switch a GPIO irqchip line from IRQ mode to say output at runtime without too much trouble. (CEC needs this.)
Thanks, I will look into Hans's RFCv2. But what would help me would be to avoid creating the IRQ for the GPIO itself (I have the latent IRQ), if I could just return that instead in gpio_to_irq(), it might be easier. I understand ->to_irq() is supposed to be a translate function only, I can avoid the dance of enabling and diabling the PDC IRQ on suspend and resume. -- Lina
I suspect that will make your work easier? Hans can you include Lina in the loop for your patches so she can take that into accoun because I think we might need that as a base for this. Yours, Linus Walleij
