linux-kernel - Re: [PATCH v2] PCI: qcom: Fix the fixup of PCI_VENDOR_ID

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Message-ID: <d9282b27-63ea-b1d6-1e43-9c7359f5f8d4@mm-sol.com>
Date:   Wed, 26 Feb 2020 11:27:23 +0200
From:   Stanimir Varbanov <svarbanov@...sol.com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andrew Murray <andrew.murray@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v2] PCI: qcom: Fix the fixup of PCI_VENDOR_ID_QCOM

Hi Lorenzo,

On 2/21/20 4:35 PM, Lorenzo Pieralisi wrote:
> On Mon, Dec 30, 2019 at 09:25:28PM +0100, Marc Gonzalez wrote:
>> On 29/12/2019 03:45, Bjorn Andersson wrote:
>>
>>> On Sat 28 Dec 07:41 PST 2019, Marc Gonzalez wrote:
>>>
>>>> On 27/12/2019 09:51, Stanimir Varbanov wrote:
>>>>
>>>>> On 12/27/19 3:27 AM, Bjorn Andersson wrote:
>>>>>
>>>>>> There exists non-bridge PCIe devices with PCI_VENDOR_ID_QCOM, so limit
>>>>>> the fixup to only affect the relevant PCIe bridges.
>>>>>>
>>>>>> Cc: stable@...r.kernel.org
>>>>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>>>>>> ---
>>>>>>
>>>>>> Stan, I picked up all the suggested device id's from the previous thread and
>>>>>> added 0x1000 for QCS404. I looked at creating platform specific defines in
>>>>>> pci_ids.h, but SDM845 has both 106 and 107... Please let me know if you would
>>>>>> prefer that I do this anyway.
>>>>>
>>>>> Looks good,
>>>>>
>>>>> Acked-by: Stanimir Varbanov <svarbanov@...sol.com>
>>>>>
>>>>>>  drivers/pci/controller/dwc/pcie-qcom.c | 8 +++++++-
>>>>>>  1 file changed, 7 insertions(+), 1 deletion(-)
>>>>>>
>>>>>> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
>>>>>> index 5ea527a6bd9f..138e1a2d21cc 100644
>>>>>> --- a/drivers/pci/controller/dwc/pcie-qcom.c
>>>>>> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
>>>>>> @@ -1439,7 +1439,13 @@ static void qcom_fixup_class(struct pci_dev *dev)
>>>>>>  {
>>>>>>  	dev->class = PCI_CLASS_BRIDGE_PCI << 8;
>>>>>>  }
>>>>>> -DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, PCI_ANY_ID, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0106, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0107, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0302, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1000, qcom_fixup_class);
>>>>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x1001, qcom_fixup_class);
>>>>
>>>> Hrmmm... still not CCed on the patch,
>>>
>>> You are Cc'ed on the patch, but as usual your mail server responds "451
>>> too many errors from your ip" and throw my emails away.
>>>
>>>> and still don't think the fixup is required(?) for 0x106 and 0x107.
>>>>
>>>
>>> I re-read your reply in my v1 thread. So we know that 0x104 doesn't need
>>> the fixup, so presumably only 0x101 needs the fixup?
>>
>> I apologize for the tone of my reply. I did not mean to sound
>> so snarky.
>>
>> All I can say is that, if I remember correctly, the fixup was
>> not necessary on apq8098 (0x0105) and it was probably not
>> required on msm8996 and sdm845. For older platforms, all bets
>> are off.
> 
> How are we proceeding with this patch then ?

It took too much time, please take it as-is in v2 with my Ack.

We can drop the not-affected SoCs with follow-up patches once we are
sure that we do not break the supported SoCs.

-- 
regards,
Stan