[alsa-devel] My PC has 6GB memory but the limitation of the alsa-driver is 4GB.

[Takashi Iwai]

At Mon, 16 Mar 2009 22:18:03 +0900,
Emmanuel Chanel wrote:
> 
> ok. I could patch.
> I did 
> $ ./configure --with-debug=verbose
> $ make
> $ su -c 'make install'
> 
> The result is below and it's not detected on alsa. Pulse's Volume
> Control says no hardware devices but "Null Sound Output".

Hm, how about the patch below then?


thanks,

Takashi
---

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 92a73e8..eb33e15 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2136,7 +2136,7 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
 				struct azx **rchip)
 {
 	struct azx *chip;
-	int i, err;
+	int i, err, rirb_32bit;
 	unsigned short gcap;
 	static struct snd_device_ops ops = {
 		.dev_free = azx_dev_free,
@@ -2218,12 +2218,26 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
 	pci_set_master(pci);
 	synchronize_irq(chip->irq);
 
+	/* ATI chips seems buggy about 64bit CORB/RIRB addresses */
+	if (chip->driver_type == AZX_DRIVER_ATI)
+		rirb_32bit = 1;
+	else
+		rirb_32bit = 0;
+
 	gcap = azx_readw(chip, GCAP);
 	snd_printdd("chipset global capabilities = 0x%x\n", gcap);
 
 	/* allow 64bit DMA address if supported by H/W */
-	if ((gcap & 0x01) && !pci_set_dma_mask(pci, DMA_64BIT_MASK))
+	/* Don't set 64bit DMA here for the controller buffer allocations
+	 * on some buggy hardwares
+	 */
+	if (!rirb_32bit &&
+	    (gcap & 0x01) && !pci_set_dma_mask(pci, DMA_64BIT_MASK))
 		pci_set_consistent_dma_mask(pci, DMA_64BIT_MASK);
+	else {
+		pci_set_dma_mask(pci, DMA_32BIT_MASK);
+		pci_set_consistent_dma_mask(pci, DMA_32BIT_MASK);
+	}
 
 	/* read number of streams from GCAP register instead of using
 	 * hardcoded value
@@ -2309,6 +2323,11 @@ static int __devinit azx_create(struct snd_card *card, struct pci_dev *pci,
 	sprintf(card->longname, "%s at 0x%lx irq %i",
 		card->shortname, chip->addr, chip->irq);
 
+	/* allow 64bit DMA address if supported by H/W (if not set yet) */
+	if (rirb_32bit &&
+	    (gcap & 0x01) && !pci_set_dma_mask(pci, DMA_64BIT_MASK))
+		pci_set_consistent_dma_mask(pci, DMA_64BIT_MASK);
+
 	*rchip = chip;
 	return 0;