[alsa-devel] [PATCH V2 13/16] ALSA: HDA: Make hda sound card usable for Loongson.

[Clemens Ladisch]

Huacai Chen wrote:
> 1, Use 32-bit DMA as a workaround (Loongson has a hardware bug that it
>    doesn't support DMA address above 4GB).
> 2, Modify patch_conexant.c to add Lemote specific code.

Please create separate patches for these two changes.

> +++ b/include/linux/pci_ids.h
> @@ -2906,3 +2906,5 @@
>  #define PCI_DEVICE_ID_XEN_PLATFORM	0x0001
>
>  #define PCI_VENDOR_ID_OCZ		0x1b85
> +
> +#define PCI_VENDOR_ID_LEMOTE		0x1c06

AFAICS this symbol is not used in this patch.

> +#ifdef CONFIG_CPU_LOONGSON3
> +	/* Workaround: Loongson 3 doesn't support 64-bit DMA */
> +	gcap &= ~ICH6_GCAP_64OK;
> +#endif

	/* Workaround: Loongson 3 doesn't actually support 64-bit DMA */


Regards,
Clemens