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

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