VIA VT8237

VIA VT8237

[Gert Vervoort]

The following patch adds a reference to the VIA VT8237 southbridge:

--- via82xx.c.orig      2004-06-02 22:09:04.509536136 +0200
+++ via82xx.c   2004-06-02 22:40:35.773020384 +0200
@@ -136,6 +136,7 @@
 #define VIA_REV_8233           0x30    /* 2 rec, 4 pb, 1 multi-pb, spdif */
 #define VIA_REV_8233A          0x40    /* 1 rec, 1 multi-pb, spdf */
 #define VIA_REV_8235           0x50    /* 2 rec, 4 pb, 1 multi-pb, spdif */
+#define VIA_REV_8237           0x60    /* 2 rec, 4 pb, 1 multi-pb, spdif */
 
 /*
  *  Direct registers
@@ -2070,6 +2071,7 @@
        { VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
        { VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
        { VIA_REV_8235, "VIA 8235", TYPE_VIA8233 },
+       { VIA_REV_8237, "VIA 8237", TYPE_VIA8233 },
 };
 
 /*

When playing back 6 channel audio on this card, it looks like the rear 
left/right and center/LFE are switched.

Gert



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Re: VIA VT8237

[Anthony Dominic Truong]

This is a new feature in this new AC97 controller.  3D Channel SGD
Control Register (offset 0x41) is used to turn this on or off.  Writing
a 1 to bit 4 of this register enables the swapping of center and LFE
playbacks (slots 3,4,7,8,9,6).  Clearing this bit keeps the order
(3,4,7,8,6,9).
This is a bit of info I got from VIA after struggling with this swapping
for nearly a week. :-(

Regards,
Anthony Dominic Truong.


On Wed, 2004-06-02 at 13:48, Gert Vervoort wrote:
> The following patch adds a reference to the VIA VT8237 southbridge:
> 
> --- via82xx.c.orig      2004-06-02 22:09:04.509536136 +0200
> +++ via82xx.c   2004-06-02 22:40:35.773020384 +0200
> @@ -136,6 +136,7 @@
>  #define VIA_REV_8233           0x30    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>  #define VIA_REV_8233A          0x40    /* 1 rec, 1 multi-pb, spdf */
>  #define VIA_REV_8235           0x50    /* 2 rec, 4 pb, 1 multi-pb, spdif */
> +#define VIA_REV_8237           0x60    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>  
>  /*
>   *  Direct registers
> @@ -2070,6 +2071,7 @@
>         { VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
>         { VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
>         { VIA_REV_8235, "VIA 8235", TYPE_VIA8233 },
> +       { VIA_REV_8237, "VIA 8237", TYPE_VIA8233 },
>  };
>  
>  /*
> 
> When playing back 6 channel audio on this card, it looks like the rear 
> left/right and center/LFE are switched.
> 
> Gert
> 
> 
> 
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Re: VIA VT8237

[R CHAN]

I think Gert is referring to Rear L/R switched with Center/LFE
rather than Center<->LFE; indeed I have encountered exactly the
same problem myself.

[The windows test setup program allows Center<->LFE to be adjusted
but outputs Rear L/R "correctly"; I'm not sure why Alsa has got
it the other way round - maybe I need 3,4,6,9,7,8]?


Anthony Dominic Truong wrote:
> This is a new feature in this new AC97 controller.  3D Channel SGD
> Control Register (offset 0x41) is used to turn this on or off.  Writing
> a 1 to bit 4 of this register enables the swapping of center and LFE
> playbacks (slots 3,4,7,8,9,6).  Clearing this bit keeps the order
> (3,4,7,8,6,9).
> This is a bit of info I got from VIA after struggling with this swapping
> for nearly a week. :-(
> 
> Regards,
> Anthony Dominic Truong.
> 
> 
> On Wed, 2004-06-02 at 13:48, Gert Vervoort wrote:
> 
>>The following patch adds a reference to the VIA VT8237 southbridge:
>>
>>--- via82xx.c.orig      2004-06-02 22:09:04.509536136 +0200
>>+++ via82xx.c   2004-06-02 22:40:35.773020384 +0200
>>@@ -136,6 +136,7 @@
>> #define VIA_REV_8233           0x30    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>> #define VIA_REV_8233A          0x40    /* 1 rec, 1 multi-pb, spdf */
>> #define VIA_REV_8235           0x50    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>>+#define VIA_REV_8237           0x60    /* 2 rec, 4 pb, 1 multi-pb, spdif */
>> 
>> /*
>>  *  Direct registers
>>@@ -2070,6 +2071,7 @@
>>        { VIA_REV_8233, "VIA 8233", TYPE_VIA8233 },
>>        { VIA_REV_8233A, "VIA 8233A", TYPE_VIA8233A },
>>        { VIA_REV_8235, "VIA 8235", TYPE_VIA8233 },
>>+       { VIA_REV_8237, "VIA 8237", TYPE_VIA8233 },
>> };
>> 
>> /*
>>
>>When playing back 6 channel audio on this card, it looks like the rear 
>>left/right and center/LFE are switched.
>>
>>Gert
>>
>>
>>
>>-------------------------------------------------------
>>This SF.Net email is sponsored by the new InstallShield X.
>>>From Windows to Linux, servers to mobile, InstallShield X is the one
>>installation-authoring solution that does it all. Learn more and
>>evaluate today! http://www.installshield.com/Dev2Dev/0504
>>_______________________________________________
>>Alsa-devel mailing list
>>Alsa-devel@lists.sourceforge.net
>>https://lists.sourceforge.net/lists/listinfo/alsa-devel
>>
> 
> 
> 
> 
> 
> Disclaimer: The information contained in this transmission, including any 
> attachments, may contain confidential information of Matsushita Avionics 
> Systems Corporation.  This transmission is intended only for the use of the 
> addressee(s) listed above.  Unauthorized review, dissemination or other use 
> of the information contained in this transmission is strictly prohibited. 
> If you have received this transmission in error or have reason to believe 
> you are not authorized to receive it, please notify the sender by return 
> email and promptly delete the transmission 
> 
> 
> 
> 
> -------------------------------------------------------
> This SF.Net email is sponsored by the new InstallShield X.
>>From Windows to Linux, servers to mobile, InstallShield X is the one
> installation-authoring solution that does it all. Learn more and
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> _______________________________________________
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> 



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Re: VIA VT8237

[gert.vervoort]

[-- Attachment #1: Type: text/plain, Size: 444 bytes --]

> I think Gert is referring to Rear L/R switched with Center/LFE

> rather than Center<->LFE; indeed I have encountered exactly the

> same problem myself.



Yes, this is the problem



> 

> [The windows test setup program allows Center<->LFE to be adjusted

> but outputs Rear L/R "correctly"; I'm not sure why Alsa has got

> it the other way round - maybe I need 3,4,6,9,7,8]?

> 



Also on my system in Windows XP it works correctly.