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Date: Thu, 21 Dec 2023 13:55:33 +0100
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Subject: Re: [PATCH v2] r8169: Fix PCI error on system resume
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To: Kai-Heng Feng <kai.heng.feng@canonical.com>, nic_swsd@realtek.com
Cc: "David S. Miller" <davem@davemloft.net>,
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>,
 Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20231221052510.443674-1-kai.heng.feng@canonical.com>
From: Heiner Kallweit <hkallweit1@gmail.com>
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In-Reply-To: <20231221052510.443674-1-kai.heng.feng@canonical.com>
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On 21.12.2023 06:25, Kai-Heng Feng wrote:
> Some r8168 NICs stop working upon system resume:
> 
> [  688.051096] r8169 0000:02:00.1 enp2s0f1: rtl_ep_ocp_read_cond == 0 (loop: 10, delay: 10000).
> [  688.175131] r8169 0000:02:00.1 enp2s0f1: Link is Down
> ...
> [  691.534611] r8169 0000:02:00.1 enp2s0f1: PCI error (cmd = 0x0407, status_errs = 0x0000)
> 
> Not sure if it's related, but those NICs have a BMC device at function
> 0:
> 02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Realtek RealManage BMC [10ec:816e] (rev 1a)
> 
> Since increase the loop wait on rtl_ep_ocp_read_cond can eliminate the
> issue, so let rtl8168ep_driver_start() to wait a bit longer.
> 
As this fixes an actual issue, the patch should target net and have a Fixes tag.

> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> v2:
>  - Wording
> 
>  drivers/net/ethernet/realtek/r8169_main.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
> index bb787a52bc75..81fd31f6fac4 100644
> --- a/drivers/net/ethernet/realtek/r8169_main.c
> +++ b/drivers/net/ethernet/realtek/r8169_main.c
> @@ -1211,7 +1211,7 @@ static void rtl8168ep_driver_start(struct rtl8169_private *tp)
>  {
>  	r8168ep_ocp_write(tp, 0x01, 0x180, OOB_CMD_DRIVER_START);
>  	r8168ep_ocp_write(tp, 0x01, 0x30, r8168ep_ocp_read(tp, 0x30) | 0x01);
> -	rtl_loop_wait_high(tp, &rtl_ep_ocp_read_cond, 10000, 10);
> +	rtl_loop_wait_high(tp, &rtl_ep_ocp_read_cond, 10000, 30);
>  }
>  
>  static void rtl8168_driver_start(struct rtl8169_private *tp)