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SubjectRe: [PATCH 1/2] PCI: pciehp: Do not disable interrupt twice on suspend
Date
On Tuesday, June 18, 2019 2:50:50 PM CEST Mika Westerberg wrote:
> We try to keep PCIe hotplug ports runtime suspended when entering system
> suspend. Due to the fact that the PCIe portdrv sets NEVER_SKIP driver PM
> flag the PM core always calls system suspend/resume hooks even if the
> device is left runtime suspended. Since PCIe hotplug driver re-uses the
> same function for both it ends up disabling hotplug interrupt twice and
> the second time following is printed:
>
> pciehp 0000:03:01.0:pcie204: pcie_do_write_cmd: no response from device
>
> Prevent this from happening by checking whether the device is already
> runtime suspended when system suspend hook is called.
>
> Fixes: 9c62f0bfb832 ("PCI: pciehp: Implement runtime PM callbacks")
> Reported-by: Kai Heng Feng <kai.heng.feng@canonical.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
> drivers/pci/hotplug/pciehp_core.c | 25 +++++++++++++++++++++++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
> index 6ad0d86762cb..3f8c13ddb3e8 100644
> --- a/drivers/pci/hotplug/pciehp_core.c
> +++ b/drivers/pci/hotplug/pciehp_core.c
> @@ -248,7 +248,7 @@ static bool pme_is_native(struct pcie_device *dev)
> return pcie_ports_native || host->native_pme;
> }
>
> -static int pciehp_suspend(struct pcie_device *dev)
> +static void pciehp_disable_interrupt(struct pcie_device *dev)
> {
> /*
> * Disable hotplug interrupt so that it does not trigger
> @@ -256,7 +256,19 @@ static int pciehp_suspend(struct pcie_device *dev)
> */
> if (pme_is_native(dev))
> pcie_disable_interrupt(get_service_data(dev));
> +}
>
> +#ifdef CONFIG_PM_SLEEP
> +static int pciehp_suspend(struct pcie_device *dev)
> +{
> + /*
> + * If the port is already runtime suspended we can keep it that
> + * way.
> + */
> + if (dev_pm_smart_suspend_and_suspended(&dev->port->dev))
> + return 0;
> +
> + pciehp_disable_interrupt(dev);
> return 0;
> }
>
> @@ -274,6 +286,7 @@ static int pciehp_resume_noirq(struct pcie_device *dev)
>
> return 0;
> }
> +#endif
>
> static int pciehp_resume(struct pcie_device *dev)
> {
> @@ -287,6 +300,12 @@ static int pciehp_resume(struct pcie_device *dev)
> return 0;
> }
>
> +static int pciehp_runtime_suspend(struct pcie_device *dev)
> +{
> + pciehp_disable_interrupt(dev);
> + return 0;
> +}
> +
> static int pciehp_runtime_resume(struct pcie_device *dev)
> {
> struct controller *ctrl = get_service_data(dev);
> @@ -313,10 +332,12 @@ static struct pcie_port_service_driver hpdriver_portdrv = {
> .remove = pciehp_remove,
>
> #ifdef CONFIG_PM
> +#ifdef CONFIG_PM_SLEEP
> .suspend = pciehp_suspend,
> .resume_noirq = pciehp_resume_noirq,
> +#endif
> .resume = pciehp_resume,
> - .runtime_suspend = pciehp_suspend,
> + .runtime_suspend = pciehp_runtime_suspend,
> .runtime_resume = pciehp_runtime_resume,
> #endif /* PM */
> };
>




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