Messages in this thread | | | From | Ard Biesheuvel <> | Date | Tue, 18 Oct 2016 11:26:42 +0100 | Subject | Re: [PATCH] ALSA: hda - allow 40 bit DMA mask for NVidia devices |
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On 18 October 2016 at 11:25, Takashi Iwai <tiwai@suse.de> wrote: > On Mon, 17 Oct 2016 18:23:59 +0200, > Ard Biesheuvel wrote: >> >> Commit 49d9e77e72cf ("ALSA: hda - Fix system panic when DMA > 40 bits >> for Nvidia audio controllers") simply disabled any DMA exceeding 32 >> bits for NVidia devices, even though they are capable of performing >> DMA up to 40 bits. On some architectures (such as arm64), system memory >> is not guaranteed to be 32-bit addressable by PCI devices, and so this >> change prevents NVidia devices from working on platforms such as AMD >> Seattle. >> >> Since the original commit already mentioned that up to 40 bits of DMA >> is supported, and given that the code has been updated in the meantime >> to support a 40 bit DMA mask on other devices, revert commit 49d9e77e72cf >> and explicitly set the DMA mask to 40 bits for NVidia devices. >> >> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> > > Thanks, applied. Since this seems causing a real problem, I added Cc > to stable. >
Thanks!
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