linux-kernel - Re: [PATCH V1] PCI: dwc: Use dev_info for PCIe link down event logging

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Message-ID: <6bba0876-3002-0614-5aeb-c4cf901938ca@codethink.co.uk>
Date:   Thu, 27 Oct 2022 10:55:34 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Jon Hunter <jonathanh@...dia.com>,
        Bjorn Helgaas <helgaas@...nel.org>, lpieralisi@...nel.org
Cc:     Vidya Sagar <vidyas@...dia.com>, jingoohan1@...il.com,
        gustavo.pimentel@...opsys.com, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, treding@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH V1] PCI: dwc: Use dev_info for PCIe link down event
 logging

On 26/10/2022 12:39, Jon Hunter wrote:
> Hi Lorenzo,
> 
> On 18/10/2022 17:43, Bjorn Helgaas wrote:
>> On Tue, Oct 18, 2022 at 07:21:54AM +0100, Jon Hunter wrote:
>>> Hi Bjorn,
>>>
>>> On 13/09/2022 11:12, Vidya Sagar wrote:
>>>> Some of the platforms (like Tegra194 and Tegra234) have open slots and
>>>> not having an endpoint connected to the slot is not an error.
>>>> So, changing the macro from dev_err to dev_info to log the event.
>>>>
>>>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>>>> ---
>>>>    drivers/pci/controller/dwc/pcie-designware.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/pci/controller/dwc/pcie-designware.c 
>>>> b/drivers/pci/controller/dwc/pcie-designware.c
>>>> index 650a7f22f9d0..25154555aa7a 100644
>>>> --- a/drivers/pci/controller/dwc/pcie-designware.c
>>>> +++ b/drivers/pci/controller/dwc/pcie-designware.c
>>>> @@ -456,7 +456,7 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci)
>>>>        }
>>>>        if (retries >= LINK_WAIT_MAX_RETRIES) {
>>>> -        dev_err(pci->dev, "Phy link never came up\n");
>>>> +        dev_info(pci->dev, "Phy link never came up\n");
>>>>            return -ETIMEDOUT;
>>>>        }
>>>
>>>
>>> Are you OK to take this change?
>>
>> When this came up, Lorenzo was in the middle of a big move and I was
>> covering for him while he was unavailable.  But he's back, and I'm
>> sure he will resolve this soon.
>>
>> Personally I'm OK either way.
>>
>> Bjorn
> 
> 
> Can we come to a conclusion on this?
> 
> We have tests that fail when errors/warning messages are reported. We 
> can choose to ignore these errors, but given that this is not an error 
> in this case, we were thinking it is better to make it informational.

Is there any hardware presence detect available to just avoid even
trying to bring a link up on an disconnected port?


-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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