linux-kernel - Re: [PATCH 1/6] PCI/PM: Apply D2 delay as milliseconds, not microseconds

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Date:   Mon, 4 Nov 2019 11:29:03 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Linux PCI <linux-pci@...r.kernel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 1/6] PCI/PM: Apply D2 delay as milliseconds, not microseconds

On Fri, Nov 1, 2019 at 9:46 PM Bjorn Helgaas <helgaas@...nel.org> wrote:
>
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> PCI_PM_D2_DELAY is defined as 200, which is milliseconds, but previously we
> used udelay(), which only waited for 200 microseconds.  Use msleep()
> instead so we wait the correct amount of time.  See PCIe r5.0, sec 5.9.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

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

> ---
>  drivers/pci/pci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index e7982af9a5d8..cd96874ae76d 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -886,7 +886,7 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
>         if (state == PCI_D3hot || dev->current_state == PCI_D3hot)
>                 pci_dev_d3_sleep(dev);
>         else if (state == PCI_D2 || dev->current_state == PCI_D2)
> -               udelay(PCI_PM_D2_DELAY);
> +               msleep(PCI_PM_D2_DELAY);
>
>         pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
>         dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
> --
> 2.24.0.rc1.363.gb1bccd3e3d-goog
>