linux-kernel - Re: [PATCH] sky2: override for PCI legacy power management

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Message-ID: <CAErSpo67PEaZ6JuMUntWLfR8SUpQgZERD_cKV6rWd=FF0tZ6DQ@mail.gmail.com>
Date:	Wed, 21 Mar 2012 14:22:01 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Knut Petersen <Knut_Petersen@...nline.de>,
	"David S. Miller" <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>, arekm@...en.pl,
	Jared <nitro@...room.net>, dilieto@...eone.net,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] sky2: override for PCI legacy power management

On Wed, Mar 21, 2012 at 9:32 AM, Stephen Hemminger
<shemminger@...tta.com> wrote:
> Some BIOS's don't setup power management correctly (what else is
> new) and don't allow use of PCI Express power control. Add a special
> exception module parameter to allow working around this issue.
> Based on slightly different patch by Knut Petersen.
>
> Reported-by: Arkadiusz Miskiewicz <arekm@...en.pl>
> Signed-off-by: Stephen Hemminger <shemminger@...tta.com>

Is there a problem report URL you can include here?

It looks like this requires a user to figure out that he might be
suffering from this problem, then use this module parameter to work
around it.  How would a user figure that out?  Can we do it
automatically to save him the trouble?

> ---
> Patch against -net (ie. 3.3.0)
>
> --- a/drivers/net/ethernet/marvell/sky2.c       2012-01-10 10:56:56.855156017 -0800
> +++ b/drivers/net/ethernet/marvell/sky2.c       2012-03-21 08:25:52.400929532 -0700
> @@ -95,6 +95,10 @@ static int disable_msi = 0;
>  module_param(disable_msi, int, 0);
>  MODULE_PARM_DESC(disable_msi, "Disable Message Signaled Interrupt (MSI)");
>
> +static int legacy_pme = 0;
> +module_param(legacy_pme, int, 0);
> +MODULE_PARM_DESC(legacy_pme, "Legacy power management");
> +
>  static DEFINE_PCI_DEVICE_TABLE(sky2_id_table) = {
>        { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9000) }, /* SK-9Sxx */
>        { PCI_DEVICE(PCI_VENDOR_ID_SYSKONNECT, 0x9E00) }, /* SK-9Exx */
> @@ -867,6 +871,13 @@ static void sky2_wol_init(struct sky2_po
>        /* Disable PiG firmware */
>        sky2_write16(hw, B0_CTST, Y2_HW_WOL_OFF);
>
> +       /* Needed by some broken BIOSes, use PCI rather than PCI-e for WOL */
> +       if (legacy_pme) {
> +               u32 reg1 = sky2_pci_read32(hw, PCI_DEV_REG1);
> +               reg1 |= PCI_Y2_PME_LEGACY;
> +               sky2_pci_write32(hw, PCI_DEV_REG1, reg1);
> +       }
> +
>        /* block receiver */
>        sky2_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_SET);
>        sky2_read32(hw, B0_CTST);
> --
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