linux-kernel - Re: [PATCH 3.2 22/52] ALSA: hda - Disable 64bit address for Creative HDA controllers

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Message-ID: <20151126103020.GA3136@ares>
Date:	Thu, 26 Nov 2015 10:30:20 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	akpm@...ux-foundation.org, Takashi Iwai <tiwai@...e.de>
Subject: Re: [PATCH 3.2 22/52] ALSA: hda - Disable 64bit address for Creative
 HDA controllers

On Thu, Nov 26, 2015 at 12:34:33AM +0000, Ben Hutchings wrote:
> On Wed, 2015-11-25 at 23:05 +0000, Luis Henriques wrote:
> > On Tue, Nov 24, 2015 at 10:33:59PM +0000, Ben Hutchings wrote:
> > > 3.2.74-rc1 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>
> > > [bwh: Backported to 3.2: drop the change to AZX_DCAPS_PRESET_CTHDA]
> > 
> > Is there a reason for dropping this change?  Adding the
> > AZX_DCAPS_NO_64BIT flag to the AZX_DCAPS_PRESET_CTHDA definition does
> > seem to make sense.
> [...]
> 
> The AZX_DCAPS_PRESET_CTHDA macro was introduced in 3.5.
>

Doh, you're right.  I was probably looking at the wrong branch.  Sorry for
the noise.

Cheers,
--
Luís


> Ben.
> 
> -- 
> Ben Hutchings
> Unix is many things to many people,
> but it's never been everything to anybody.


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