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

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Message-ID: <87b791db-6e03-b1ab-934c-068521652117@mm-sol.com>
Date:   Thu, 7 Nov 2019 11:32:49 +0200
From:   Stanimir Varbanov <svarbanov@...sol.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        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] PCI: qcom: Fix the fixup of PCI_VENDOR_ID_QCOM

Hi Bjorn,

On 11/6/19 10:23 PM, Bjorn Andersson wrote:
> On Mon 04 Nov 05:00 PST 2019, Stanimir Varbanov wrote:
> 
>> Hi Bjorn,
>>
>> Thanks for the fix!
>>
>> On 11/2/19 2:24 AM, Bjorn Andersson wrote:
>>> There exists non-bridge PCIe devices with PCI_VENDOR_ID_QCOM, so limit
>>> the fixup to only affect the PCIe 2.0 (0x106) and PCIe 3.0 (0x107)
>>> bridges.
>>
>> Are you sure that this will not break ops_1_0_0 (Qcom IP rev.: 1.0.0
>> Synopsys IP rev.: 4.11a) i.e. apq8084 ?

OK, I've checked DEVICE IDs for all supported SoCs in pcie-qcom driver:

apq8084 0x101
ipq8064 0x101
apq8064 0x101
msm8996 0x104
ipq8074 0x302
ipq4019 0x1001
qcs404  ??? (can you check for this SoC)

As you can see they are various, so I don't think we have to expose them
in pci_ids.h. See my proposal below.

Of course the last word will be from PCI maintainers.

>>
> 
> I am not, I've only tested this on db820c and db845c. Unfortunately I'm
> unable to find a branch with the necessary dts snippets to test it. Do
> you perhaps have a branch somewhere?
> 
> Regards,
> Bjorn
> 
>>>
>>> Cc: stable@...r.kernel.org
>>> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
>>> ---
>>>  drivers/pci/controller/dwc/pcie-qcom.c | 3 ++-
>>>  include/linux/pci_ids.h                | 2 ++
>>>  2 files changed, 4 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
>>> index 35f4980480bb..b91abf4d4905 100644
>>> --- a/drivers/pci/controller/dwc/pcie-qcom.c
>>> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
>>> @@ -1441,7 +1441,8 @@ 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, PCIE_DEVICE_ID_QCOM_PCIE20, qcom_fixup_class);
>>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, PCIE_DEVICE_ID_QCOM_PCIE30, 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, 0x1001, qcom_fixup_class);

>>>  
>>>  static struct platform_driver qcom_pcie_driver = {
>>>  	.probe = qcom_pcie_probe,
>>> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
>>> index 21a572469a4e..3d0724ee4d2f 100644
>>> --- a/include/linux/pci_ids.h
>>> +++ b/include/linux/pci_ids.h
>>> @@ -2413,6 +2413,8 @@
>>>  #define PCI_VENDOR_ID_LENOVO		0x17aa
>>>  
>>>  #define PCI_VENDOR_ID_QCOM		0x17cb
>>> +#define PCIE_DEVICE_ID_QCOM_PCIE20	0x0106
>>> +#define PCIE_DEVICE_ID_QCOM_PCIE30	0x0107

... and drop these additions.

>>>  
>>>  #define PCI_VENDOR_ID_CDNS		0x17cd
>>>  
>>>
>>
>> -- 
>> regards,
>> Stan

-- 
regards,
Stan