Re: [PATCH] PCI: pciehp: Add quirk for QDF2400 Command Completed erratum

From: okaya@codeaurora.org
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: linux-pci@vger.kernel.org, timur@codeaurora.org,
	sulrich@codeaurora.org, Keith Busch <keith.busch@intel.com>,
	Kees Cook <keescook@chromium.org>,
	linux-arm-msm@vger.kernel.org,
	open list <linux-kernel@vger.kernel.org>,
	stable@vger.kernel.org, Lukas Wunner <lukas@wunner.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Markus Elfring <elfring@users.sourceforge.net>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] PCI: pciehp: Add quirk for QDF2400 Command Completed erratum
Date: Mon, 07 May 2018 22:41:40 +0100	[thread overview]
Message-ID: <15288037a0316d181d6fd12813f468ad@codeaurora.org> (raw)
In-Reply-To: <20180507213531.GB133147@bhelgaas-glaptop.roam.corp.google.com>

On 2018-05-07 22:35, Bjorn Helgaas wrote:
> On Sun, May 06, 2018 at 06:30:53AM -0400, Sinan Kaya wrote:
>> The QDF2400 controller does not set the Command Completed bit unless
>> writes to the Slot Command register change "Control" bits.  Command
>> Completed is never set for writes that only change software 
>> notification
>> "Enable" bits.  This results in timeouts like this:
>> 
>> pciehp 0000:00:00.0:pcie004: Timeout on hotplug command 0x1038
>> 
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
> 
> Since there's no bisection benefit for keeping these separate, I folded
> this into the original quirk and added Mika's reviewed-by.
> 
> I also added the following ID patch and used PCI_VENDOR_ID_QCOM:

Thanks for the clean up.

> 
> commit 333c8c1216c1e7ead6af7b3d667b43eb425b5034
> Author: Bjorn Helgaas <bhelgaas@google.com>
> Date:   Mon May 7 15:52:55 2018 -0500
> 
>     PCI: Add Qualcomm vendor ID
> 
>     Add the Qualcomm vendor ID to pci_ids.h and use it in quirks.
> 
>     Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index 2990ad1e7c99..e7bf44515fd6 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -4361,8 +4361,8 @@ static const struct pci_dev_acs_enabled {
>  	{ PCI_VENDOR_ID_INTEL, 0x15b7, pci_quirk_mf_endpoint_acs },
>  	{ PCI_VENDOR_ID_INTEL, 0x15b8, pci_quirk_mf_endpoint_acs },
>  	/* QCOM QDF2xxx root ports */
> -	{ 0x17cb, 0x400, pci_quirk_qcom_rp_acs },
> -	{ 0x17cb, 0x401, pci_quirk_qcom_rp_acs },
> +	{ PCI_VENDOR_ID_QCOM, 0x0400, pci_quirk_qcom_rp_acs },
> +	{ PCI_VENDOR_ID_QCOM, 0x0401, pci_quirk_qcom_rp_acs },
>  	/* Intel PCH root ports */
>  	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
>  	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_spt_pch_acs },
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index cc608fc55334..883cb7bf78aa 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -2387,6 +2387,8 @@
> 
>  #define PCI_VENDOR_ID_LENOVO		0x17aa
> 
> +#define PCI_VENDOR_ID_QCOM		0x17cb
> +
>  #define PCI_VENDOR_ID_CDNS		0x17cd
> 
>  #define PCI_VENDOR_ID_ARECA		0x17d3
> 
>> ---
>>  drivers/pci/hotplug/pciehp_hpc.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>> 
>> diff --git a/drivers/pci/hotplug/pciehp_hpc.c 
>> b/drivers/pci/hotplug/pciehp_hpc.c
>> index e70eba5..974a8f1 100644
>> --- a/drivers/pci/hotplug/pciehp_hpc.c
>> +++ b/drivers/pci/hotplug/pciehp_hpc.c
>> @@ -914,3 +914,9 @@ static void quirk_cmd_compl(struct pci_dev *pdev)
>>  }
>>  DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
>>  			      PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
>> +
>> +DECLARE_PCI_FIXUP_CLASS_EARLY(0x17cb, 0x400,
>> +			      PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
>> +
>> +DECLARE_PCI_FIXUP_CLASS_EARLY(0x17cb, 0x401,
>> +			      PCI_CLASS_BRIDGE_PCI, 8, quirk_cmd_compl);
>> --
>> 2.7.4
>> 
>> 
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