At Wed, 01 Oct 2014 12:09:53 +1000,
Benjamin Herrenschmidt wrote:
>
> The chipset has a limitation in the number of address bits it
> can generate. The graphics portion uses a specific mask of
> 40 or 48 bits depending on the generation. For audio, it's a bit
> less of an issue, so just mark them as no-64bit for now.
>
> Without this, it crashes on POWER machines which can use high bits
> in the DMA address to distinguish between DMA windows.
>
> Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> CC: <stable@xxxxxxxxxxxxxxx>
> ---
> sound/pci/hda/hda_intel.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index 3e6d22d..2b679d5 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -297,7 +297,7 @@ 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_MSI64)
> + AZX_DCAPS_NO_MSI64 | AZX_DCAPS_NO_64BIT)
The only concern is that this will disable 64bit DMA also on x86 where
it has been working fine. Can we add an ifdef CONFIG_PPC for this?
Takashi
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