linux-kernel - [PATCH 3.19.y-ckt 063/164] ALSA: hda - Disable 64bit address for Creative HDA controllers

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Message-Id: <1449075615-20754-64-git-send-email-kamal@canonical.com>
Date:	Wed,  2 Dec 2015 08:58:34 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Takashi Iwai <tiwai@...e.de>, Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 063/164] ALSA: hda - Disable 64bit address for Creative HDA controllers

3.19.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@...e.de>

commit cadd16ea33a938d49aee99edd4758cc76048b399 upstream.

We've had many reports that some Creative sound cards with CA0132
don't work well.  Some reported that it starts working after reloading
the module, while some reported it starts working when a 32bit kernel
is used.  All these facts seem implying that the chip fails to
communicate when the buffer is located in 64bit address.

This patch addresses these issues by just adding AZX_DCAPS_NO_64BIT
flag to the corresponding PCI entries.  I casually had a chance to
test an SB Recon3D board, and indeed this seems helping.

Although this hasn't been tested on all Creative devices, it's safer
to assume that this restriction applies to the rest of them, too.  So
the flag is applied to all Creative entries.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 sound/pci/hda/hda_intel.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index a4e6e2f..9de6d8f 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -324,6 +324,7 @@ enum {
 
 #define AZX_DCAPS_PRESET_CTHDA \
 	(AZX_DCAPS_NO_MSI | AZX_DCAPS_POSFIX_LPIB |\
+	 AZX_DCAPS_NO_64BIT |\
 	 AZX_DCAPS_4K_BDLE_BOUNDARY | AZX_DCAPS_SNOOP_OFF)
 
 /*
@@ -2196,11 +2197,13 @@ static const struct pci_device_id azx_ids[] = {
 	  .class = PCI_CLASS_MULTIMEDIA_HD_AUDIO << 8,
 	  .class_mask = 0xffffff,
 	  .driver_data = AZX_DRIVER_CTX | AZX_DCAPS_CTX_WORKAROUND |
+	  AZX_DCAPS_NO_64BIT |
 	  AZX_DCAPS_RIRB_PRE_DELAY | AZX_DCAPS_POSFIX_LPIB },
 #else
 	/* this entry seems still valid -- i.e. without emu20kx chip */
 	{ PCI_DEVICE(0x1102, 0x0009),
 	  .driver_data = AZX_DRIVER_CTX | AZX_DCAPS_CTX_WORKAROUND |
+	  AZX_DCAPS_NO_64BIT |
 	  AZX_DCAPS_RIRB_PRE_DELAY | AZX_DCAPS_POSFIX_LPIB },
 #endif
 	/* CM8888 */
-- 
1.9.1

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