Re: [PATCH 3/4] sound/hda/radeon: Generalize 64-bit MSI quirks

[Alex Deucher <alexdeucher@gmail.com>]

On Tue, Sep 30, 2014 at 10:09 PM, Benjamin Herrenschmidt
<benh@kernel.crashing.org> wrote:
> A number of radeon cards have a HW limitation causing them to be
> unable to generate the full 64-bit of address bits for MSIs. This
> breaks MSIs on some platforms such as POWER machines.
>
> We used to have a powerpc specific quirk to address that on a
> single card, but this doesn't scale very well, this is better
> put under control of the drivers who know precisely what a given
> HW revision can do.
>
> This moves the setting of the quirk flag to the HDA driver when
> detecting the radeon audio interface.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> CC: <stable@vger.kernel.org>

This only applies to pre Sea-Islands asics, same as the GPU side.

Alex

> ---
>  arch/powerpc/kernel/pci_64.c |  6 ------
>  sound/pci/hda/hda_intel.c    | 10 ++++++++--
>  sound/pci/hda/hda_priv.h     |  1 +
>  3 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
> index 66e1cd0..b15194e 100644
> --- a/arch/powerpc/kernel/pci_64.c
> +++ b/arch/powerpc/kernel/pci_64.c
> @@ -266,9 +266,3 @@ int pcibus_to_node(struct pci_bus *bus)
>  }
>  EXPORT_SYMBOL(pcibus_to_node);
>  #endif
> -
> -static void quirk_radeon_32bit_msi(struct pci_dev *dev)
> -{
> -       dev->force_32bit_msi = true;
> -}
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0xaa68, quirk_radeon_32bit_msi);
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index aa302fb..3e6d22d 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -296,7 +296,8 @@ enum {
>
>  /* quirks for ATI/AMD HDMI */
>  #define AZX_DCAPS_PRESET_ATI_HDMI \
> -       (AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB)
> +       (AZX_DCAPS_NO_TCSEL | AZX_DCAPS_SYNC_WRITE | AZX_DCAPS_POSFIX_LPIB|\
> +        AZX_DCAPS_NO_MSI64)
>
>  /* quirks for Nvidia */
>  #define AZX_DCAPS_PRESET_NVIDIA \
> @@ -1505,9 +1506,14 @@ static int azx_first_init(struct azx *chip)
>                 return -ENXIO;
>         }
>
> -       if (chip->msi)
> +       if (chip->msi) {
> +               if (chip->driver_caps & AZX_DCAPS_NO_MSI64) {
> +                       dev_dbg(card->dev, "Disabling 64bit MSI\n");
> +                       pci->force_32bit_msi = true;
> +               }
>                 if (pci_enable_msi(pci) < 0)
>                         chip->msi = 0;
> +       }
>
>         if (azx_acquire_irq(chip, 0) < 0)
>                 return -EBUSY;
> diff --git a/sound/pci/hda/hda_priv.h b/sound/pci/hda/hda_priv.h
> index 949cd43..5016014 100644
> --- a/sound/pci/hda/hda_priv.h
> +++ b/sound/pci/hda/hda_priv.h
> @@ -171,6 +171,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 };
>  #define AZX_DCAPS_PM_RUNTIME   (1 << 26)       /* runtime PM support */
>  #define AZX_DCAPS_I915_POWERWELL (1 << 27)     /* HSW i915 powerwell support */
>  #define AZX_DCAPS_CORBRP_SELF_CLEAR (1 << 28)  /* CORBRP clears itself after reset */
> +#define AZX_DCAPS_NO_MSI64      (1 << 29)      /* Stick to 32-bit MSIs */
>
>  /* HD Audio class code */
>  #define PCI_CLASS_MULTIMEDIA_HD_AUDIO  0x0403
>
>
>