[wdmaudiodev] Re: ac97+ICH5 can not playback sound.
- From: "rai" <rai.nuaa@xxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 1 Jun 2006 22:28:55 -0800
Found the reason:
the chip is AD1980,
and Dell uses the "Miscellanous bit" (0x76) from that codec in a different way
from most AD1980 implementations.
I found in linux kernel 2.4 there is a solution:
/* Switch the inputs/outputs over (from Dell code) */
control = codec->codec_read(codec, AC97_AD_MISC);
codec->codec_write(codec, AC97_AD_MISC, control | 0x4420);
I tried. It works!
>
>
>Hi Hakon,
>Thanks for the information.
>
>My purpose is to have demo of our previous product, the product works on
>Intel845GE chipset (ICH4)
>But that motherboard is out of date, even can not be found it in Fry's :)
>
>So I have to use another motherboard which uses Intel 865G chipset (ICH5)
>It's a quite normal DELL desktop PC.
>Actually the motherboard has a driver provided by ADI (soundMax).
>So I don't know where they shareing jacks or not.
>
>But every time I query codecs ready or not, the GLOB_STA register always
>return 0x10700000,
>that meas it has tertiary codec, no primary codec..
>quite strange..
>
>>
>>Dear Rai,
>>
>>I am not sure this is the cause of your issue but the AC-97 spec is
>>essentially broken from a unified driver POV due to jack sharing wiring
>>techniques introduced around the time ICH5 appeared (but it also happens
>>on board designs with AC-97 codecs attached to other chipsets).
>>
>>Background:
>>At some point the industry required a jack sharing system as some system
>>vendors wanted to ship a 5.1 codec system but didn't want the expense of
>>populating two 3-jack stacks on their Motherboards. I believe a
>>prominent chipset vendor's board design division came up with a jack
>>sharing arrangement on one 3 jack stack as follows:
>>
>>Pink Jack: Primary function: MIC In. Secondary function C/LFE Out Green
>>Jack: Line Out with HP drive, no input function Blue Jack: Primary
>>Function: Line In. Secondary function Surround Out.
>>
>>From a hardware perspective the input/output pins were wired in parallel
>>or there was a multiplexer in the codec to switch one set of pins
>>between input and the output in the codec.
>>
>>The jack sharing combinations had system design specific variances (e.g.
>>MIC shared with Surround instead of C/LFE and Line In shared with MIC
>>instead of Surround) this "3 jack sharing scheme" became pretty much the
>>defacto standard for channel motherboard products.
>>
>>In any case all shipped with IHV provided drivers/software to make this
>>all work correctly platform by platform, delineated in the INF via
>>SSID's. And so the spec was no longer suitable for unified chipset based
>>drivers.
>>
>>You could try plugging your headset or speakers into one of the other
>>jacks to see if this is the issue you are seeing.
>>
>>Microsoft created the UAA initiative which is requiring audio HW
>>solutions (like HD Audio) that can report the system design dependent
>>wiring of the codec to the OS in part to avoid this kind of problem in
>>the future.
>>
>>Sincerely,
>>
>>Hakon Strande
>>PM Integrated, Internal, External, and Wireless Audio Devices
>>MediaTech/DMD/Windows Client/Microsoft
>>
>>-----Original Message-----
>>From: wdmaudiodev-bounce@xxxxxxxxxxxxx
>>[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of rai
>>Sent: Thursday, June 01, 2006 4:09 PM
>>To: wdmaudiodev
>>Subject: [wdmaudiodev] ac97+ICH5 can not playback sound.
>>
>>
>>Hi All,
>>I am working on a AC97 driver for WinXP.
>>I started from the sample driver code provided by XDDK.
>>
>>First time, I installed the driver on an Intel 845GE machine (ICH4),
>>the driver reported that : PrimaryCodecReady timed out.
>>then I modified
>>NTSTATUS CAdapterCommon::PrimaryCodecReady (void),
>>make sure that the function will always return STATUS_SUCCESS.
>>then, the driver can basically work (play/record) on ICH4.
>>
>>After that I tried the driver on ICH5, it also report primary codec is
>>not ready,
>>after I did the same thing(modify the function), the driver can be
>>installed.
>>Device manager also report that the driver works properly.
>>But I can not hear any sound from the speaker jak.
>>
>>I think there must be some difference between ICH4 and ICH5 on
>>controlling AC97 codec,
>>but I am not familiar with AC97 standard.
>>Does anybody here can help or has the same experience?
>>Thanks.
>>
>>Rai.
>>2006-06-01
>>
>>
>>
>>
>>
>>
>>
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>
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