netdev - Re: [PATCH net-next] r8169: avoid link-up interrupt issue on RTL8106e if user enables ASPM

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Date:   Fri, 11 Jun 2021 16:04:10 +0800
From:   Koba Ko <koba.ko@...onical.com>
To:     Heiner Kallweit <hkallweit1@...il.com>,
        Kai Heng Feng <kai.heng.feng@...onical.com>
Cc:     Jakub Kicinski <kuba@...nel.org>,
        David Miller <davem@...emloft.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next] r8169: avoid link-up interrupt issue on RTL8106e
 if user enables ASPM

On Fri, Jun 11, 2021 at 4:57 AM Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> It has been reported that on RTL8106e the link-up interrupt may be
> significantly delayed if the user enables ASPM L1. Per default ASPM
> is disabled. The change leaves L1 enabled on the PCIe link (thus still
> allowing to reach higher package power saving states), but the
> NIC won't actively trigger it.
>
> Reported-by: Koba Ko <koba.ko@...onical.com>
> Tested-by: Koba Ko <koba.ko@...onical.com>
> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
> ---
>  drivers/net/ethernet/realtek/r8169_main.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index 64f94a3fe..6a9fe9f7e 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -3508,7 +3508,6 @@ static void rtl_hw_start_8106(struct rtl8169_private *tp)
>         rtl_eri_write(tp, 0x1b0, ERIAR_MASK_0011, 0x0000);
>
>         rtl_pcie_state_l2l3_disable(tp);
> -       rtl_hw_aspm_clkreq_enable(tp, true);
>  }

As per 0866cd15029b, this also affects the intel soc idle state.
Even the result is positive currently, I think this modification would
have higher risk.

>
>  DECLARE_RTL_COND(rtl_mac_ocp_e00e_cond)
> --
> 2.32.0
>