Re: [PATCH] PCI: disable MSI on SiS 761

From	Bjorn Helgaas <helgaas@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] PCI: disable MSI on SiS 761
Date	2015-09-24 20:30 +0200
Message-ID	<qcjrj-2AE-5@gated-at.bofh.it> (permalink)
References	<q7DTH-57T-7@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi Ondrej,

On Fri, Sep 11, 2015 at 11:12:17PM +0200, Ondrej Zary wrote:
> MSI is broken on SiS 761 chipset at least on PC Chips A31G board.
> No interrupts are delivered once MSI is enabled for a device. This causes
> hang on X11 start with a nVidia card installed (with nouveau driver).
> 
> Disable MSI completely for this chipset.
> 
> Signed-off-by: Ondrej Zary <linux@rainbow-software.org>

This is a pretty old chipset, isn't it?  Google finds a reference to
SiS 761GX from 2005.  I wonder why we're only finding this problem
now.  Is there a problem report?  I wonder if the problem is really
elsewhere, and turning off MSI just avoids the real problem.

Bjorn

> ---
>  drivers/pci/quirks.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index e9fd0e9..6caffc3 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -2204,6 +2204,7 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT3336, quirk_disab
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT3351, quirk_disable_all_msi);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VT3364, quirk_disable_all_msi);
>  DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8380_0, quirk_disable_all_msi);
> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SI, 0x0761, quirk_disable_all_msi);
>  
>  /* Disable MSI on chipsets that are known to not support it */
>  static void quirk_disable_msi(struct pci_dev *dev)
> -- 
> Ondrej Zary
> 
> --
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Re: [PATCH] PCI: disable MSI on SiS 761 Bjorn Helgaas <helgaas@kernel.org> - 2015-09-24 20:30 +0200
  Re: [PATCH] PCI: disable MSI on SiS 761 Ondrej Zary <linux@rainbow-software.org> - 2015-09-24 21:30 +0200

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