This is a note to let you know that I've just added the patch titled
ALSA: hda - Limit 40bit DMA for AMD HDMI controllers
to the 3.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-hda-limit-40bit-dma-for-amd-hdmi-controllers.patch
and it can be found in the queue-3.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 413cbf469a19e7662ba5025695bf5a573927105a Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Wed, 1 Oct 2014 10:30:53 +0200
Subject: ALSA: hda - Limit 40bit DMA for AMD HDMI controllers
From: Takashi Iwai <tiwai@xxxxxxx>
commit 413cbf469a19e7662ba5025695bf5a573927105a upstream.
AMD/ATI HDMI controller chip models, we already have a filter to lower
to 32bit DMA, but the rest are supposed to be working with 64bit
although the hardware doesn't really work with 63bit but only with 40
or 48bit DMA. In this patch, we take 40bit DMA for safety for the
AMD/ATI controllers as the graphics drivers does.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/hda/hda_intel.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -1484,6 +1484,7 @@ static int azx_first_init(struct azx *ch
struct snd_card *card = chip->card;
int err;
unsigned short gcap;
+ unsigned int dma_bits = 64;
#if BITS_PER_LONG != 64
/* Fix up base address on ULI M5461 */
@@ -1520,9 +1521,14 @@ static int azx_first_init(struct azx *ch
gcap = azx_readw(chip, GCAP);
dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);
+ /* AMD devices support 40 or 48bit DMA, take the safe one */
+ if (chip->pci->vendor == PCI_VENDOR_ID_AMD)
+ dma_bits = 40;
+
/* disable SB600 64bit support for safety */
if (chip->pci->vendor == PCI_VENDOR_ID_ATI) {
struct pci_dev *p_smbus;
+ dma_bits = 40;
p_smbus = pci_get_device(PCI_VENDOR_ID_ATI,
PCI_DEVICE_ID_ATI_SBX00_SMBUS,
NULL);
@@ -1552,9 +1558,11 @@ static int azx_first_init(struct azx *ch
}
/* allow 64bit DMA address if supported by H/W */
- if ((gcap & AZX_GCAP_64OK) && !pci_set_dma_mask(pci, DMA_BIT_MASK(64)))
- pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(64));
- else {
+ if (!(gcap & AZX_GCAP_64OK))
+ dma_bits = 32;
+ if (!pci_set_dma_mask(pci, DMA_BIT_MASK(dma_bits))) {
+ pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(dma_bits));
+ } else {
pci_set_dma_mask(pci, DMA_BIT_MASK(32));
pci_set_consistent_dma_mask(pci, DMA_BIT_MASK(32));
}
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-3.17/alsa-usb-audio-add-ctrl-message-delay-quirk-for.patch
queue-3.17/asoc-dpcm-fix-race-between-fe-be-updates-and-trigger.patch
queue-3.17/alsa-hda-one-more-hp-machine-needs-to-change-mute-led-quirk.patch
queue-3.17/alsa-hda-limit-40bit-dma-for-amd-hdmi-controllers.patch
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