linux-kernel - Re: boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets)

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Message-ID: <87zh35k5xa.fsf@nanos.tec.linutronix.de>
Date:   Wed, 25 Nov 2020 12:54:41 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Stefan Bühler 
        <stefan.buehler@....uni-stuttgart.de>,
        sean.v.kelley@...ux.intel.com
Cc:     bhelgaas@...gle.com, bp@...en8.de, corbet@....net,
        kar.hin.ong@...com, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        mingo@...hat.com, sassmann@...nic.de, x86@...nel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets)

Stefan,

On Wed, Sep 16 2020 at 12:12, Stefan Bühler wrote:

sorry for the delay. This fell through the cracks.

> this quirk breaks our serial ports PCIe card (i.e. we don't see any 
> output from the connected devices; no idea whether anything we send 
> reaches them):
>
> 05:00.0 PCI bridge: PLX Technology, Inc. PEX8112 x1 Lane PCI Express-to-PCI Bridge (rev aa)
> 06:00.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Uart)
> 06:00.1 Bridge: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Disabled)
> 06:01.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Uart)
> 06:01.1 Bridge: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART)
> function 0 (Disabled)

Can you please provide the output of:

 for ID in 05:00.0 06:00.0 06:00.1 06:01.0 06:01.1; do lspci -s $ID -vvv; done

Thanks,

        tglx