linux-kernel - Re: r8169 take too long to complete driver initialization

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Date:   Fri, 2 Feb 2018 10:02:46 +0800
From:   Chris Chiu <chiu@...lessm.com>
To:     Hau <hau@...ltek.com>
Cc:     nic_swsd <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux Upstreaming Team <linux@...lessm.com>
Subject: Re: r8169 take too long to complete driver initialization

On Tue, Jan 30, 2018 at 8:07 PM, Chris Chiu <chiu@...lessm.com> wrote:
> On Mon, Jan 29, 2018 at 11:24 PM, Hau <hau@...ltek.com> wrote:
>> Hi Chris,
>>
>> Could you test following patch?
>>
>>  DECLARE_RTL_COND(rtl_ocp_tx_cond)
>>  {
>>         void __iomem *ioaddr = tp->mmio_addr;
>>
>> -       return RTL_R8(IBISR0) & 0x02;
>> +       return RTL_R8(IBISR0) & 0x20;
>>  }
>>
>>  static void rtl8168ep_stop_cmac(struct rtl8169_private *tp)
>>  {
>>         void __iomem *ioaddr = tp->mmio_addr;
>>
>>         RTL_W8(IBCR2, RTL_R8(IBCR2) & ~0x01);
>> -       rtl_msleep_loop_wait_low(tp, &rtl_ocp_tx_cond, 50, 2000);
>> +       rtl_msleep_loop_wait_high(tp, &rtl_ocp_tx_cond, 50, 2000);
>>         RTL_W8(IBISR0, RTL_R8(IBISR0) | 0x20);
>>         RTL_W8(IBCR0, RTL_R8(IBCR0) & ~0x01);
>>  }
>>
>> Thanks.
>>
>
> Yes. It completes the initialization in 70 ms. So it means the rtl_ocp_tx_cond
> are waiting for incorrect register bit? Can you help work out a patch for this?
>
> Chris
>
>

Gentle ping,
cheers.

Chris

>>> -----Original Message-----
>>> From: Chris Chiu [mailto:chiu@...lessm.com]
>>> Sent: Monday, January 29, 2018 6:12 PM
>>> To: nic_swsd <nic_swsd@...ltek.com>; netdev@...r.kernel.org; Linux
>>> Kernel <linux-kernel@...r.kernel.org>; Linux Upstreaming Team
>>> <linux@...lessm.com>
>>> Subject: Re: r8169 take too long to complete driver initialization
>>>
>>> On Fri, Jan 5, 2018 at 10:17 AM, Chris Chiu <chiu@...lessm.com> wrote:
>>> > On Wed, Dec 20, 2017 at 4:41 PM, Chris Chiu <chiu@...lessm.com> wrote:
>>> >> Hi,
>>> >>     We've hit a suspend/resume issue on a Acer desktop caused by
>>> >> r8169 driver. The dmseg
>>> >> https://gist.github.com/mschiu77/b741849b5070281daaead8dfee312d1a
>>> >> shows it's still in msleep() within a mutex lock.
>>> >>     After looking into the code, it's caused by the
>>> >> rtl8168ep_stop_cmac() which is waiting 100 seconds for
>>> >> rtl_ocp_tx_cond. The following dmesg states that the r8169 driver is
>>> >> loaded.
>>> >>
>>> >> [   20.270526] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
>>> >>
>>> >> But it takes > 100 seconds to get the following messages
>>> >>
>>> >> [  140.400223] r8169 0000:02:00.0 (unnamed net_device)
>>> >> (uninitialized): rtl_ocp_tx_cond == 1 (loop: 2000, delay: 50).
>>> >> [  140.413294] r8169 0000:02:00.0 eth0: RTL8168ep/8111ep at
>>> >> 0xffffb16c80db1000, f8:0f:41:ea:74:0d, XID 10200800 IRQ 46 [
>>> >> 140.413297] r8169 0000:02:00.0 eth0: jumbo features [frames: 9200
>>> >> bytes, tx checksumming: ko]
>>> >>
>>> >> So any trial to suspend the machine during this period would always
>>> >> get device/resource busy message then abort. Is this  rtl_ocp_tx_cond
>>> >> necessary? Because the ethernet is still working and I don't see any
>>> >> problem. I don't know it should be considered normal or not. Please
>>> >> let me know if any more information required. Thanks
>>> >>
>>> >> Chris
>>> >
>>> > gentle ping,
>>> >
>>> > cheers.
>>>
>>> Hi,
>>>     Just found a r8168 driver which seems to be authrized by realtek for cross
>>> comparison. I tried applying the patch to latest 4.15 kernel and the driver
>>> done it's initialization in faily short time. The patch file is here
>>>     https://gist.github.com/mschiu77/fcf406e64a1a437f46cf2be643f1057d.
>>>
>>>     In mainline r8169.c, the IBISR0 register need to be polled in the
>>> rtl8168ep_stop_cmac().
>>> In the patch file, there's also the same IBISR0 polling code in
>>> Dash2DisableTx(), but it's been bypassed since the chipset maches
>>> HW_DASH_SUPPORT_TYPE_2.
>>> Per the rtl_chip_info[] in r8168_n.c, CFG_METHOD_23/27/28 are
>>> HW_DASH_SUPPORT_TYPE_2, and they happens to be the only 3 named
>>> RTL8168EP/8111EP in the rtl_chip_info[].
>>>
>>>     To find the same matches in r8169.c, RTL_GIGA_MAC_VER_49/50/51
>>> seems share the same config. Can anyone clarify if the rtl_ocp_tx_cond()
>>> really necessary for 8168EP/8111EP?
>>> Or we can just ignore the condition check for RTL_GIGA_MAC_VER_49/50/51?
>>>
>>> Chris
>>>
>>> ------Please consider the environment before printing this e-mail.