CR_TOTAL_TX_FRM register

[Benoit PAPILLAULT]

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Hello,

I'm currently trying to understand the Zydas chip (I found out that all
my machine / servers are using it). I'm trying to learn mac80211 as well
(I have some experience with ath5k & rt2x00).

Anyway, I tried to read the CR_TOTAL_TX_FRM (see zd_chip.h) and this
register is always 0, except few times where it is 1. Apparently, this
register is reset when it is read. However, I need to transfer several
MB before getting a 1.

Is that normal? How I can debug further?

Regards,
Benoit
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[Benoit PAPILLAULT]

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Benoit PAPILLAULT a écrit :

> Hello,
>
> I'm currently trying to understand the Zydas chip (I found out that all
> my machine / servers are using it). I'm trying to learn mac80211 as well
> (I have some experience with ath5k & rt2x00).
>
> Anyway, I tried to read the CR_TOTAL_TX_FRM (see zd_chip.h) and this
> register is always 0, except few times where it is 1. Apparently, this
> register is reset when it is read. However, I need to transfer several
> MB before getting a 1.
>
> Is that normal? How I can debug further?
>
> Regards,
> Benoit

Hello,

I've tried the vendor driver ZD1211LnxDrv_2_22_0_0 and the TotalTxFrm
register IS updated (using a 2.6.18 kernel this time). So it seems the
zd1211rw driver is missing something.

How I can help debugging this?

Regards,
Benoit
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[Benoit PAPILLAULT]

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Benoit PAPILLAULT a écrit :

> Hello,
>
> I've tried the vendor driver ZD1211LnxDrv_2_22_0_0 and the TotalTxFrm
> register IS updated (using a 2.6.18 kernel this time). So it seems the
> zd1211rw driver is missing something.
>
> How I can help debugging this?
>
> Regards,
> Benoit

Hello,

I found out what's wrong. Each 32 bits register is read using 2 16 bits
read request over the USB bus and since the ZD_RetryCnt is a
read-and-clear register, if we read the wrong 16 bits part first, the
other part is reset. This explain why I was getting always 0.

I'll try to do a patch in the next couple of days for zd_ioread32v_locked.

Regards,
Benoit
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ahead of the curve. Join us from November 9 - 12, 2009. Register now!
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