Messages in this thread | | | Date | Thu, 28 Feb 2002 17:33:10 -0500 | From | Jeff Garzik <> | Subject | Re: [Emu10k1-devel] Re: Emu10k1 SPDIF passthru doesn't work if |
| |
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 | - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |