Re: [Emu10k1-devel] Re: Emu10k1 SPDIF passthru doesn't work if

From: Jeff Garzik (jgarzik@mandrakesoft.com)
Date: Thu Feb 28 2002 - 17:33:10 EST

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Rui Sousa wrote:
>
> On Wed, 27 Feb 2002, Alan Cox wrote:
>
> It's true dma_addr_t does change from u32 to u64 and we do thinks like:
>
> (32 bit pci register) = cpu_to_le32(dma_handle)
>
> What is the correct way of doing this?
>
> (32 bit pci register) = cpu_to_le32((u32)dma_handle)

If you only have 32 bits, then I presume 64-bit DMA isn't supported.

So, (1) never pass more than 0xffffffff to pci_set_dma_mask, and (2)
just truncate dma_addr_t (addr & 0xffffffff) so that you only read the
low 32-bits, always.

Jeff

-- 
Jeff Garzik      | "UNIX enhancements aren't."
Building 1024    |           -- says /usr/games/fortune
MandrakeSoft     |
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