unexpected value into

[Holger Schurig]

I added some printk's to libertas_cs.c which are quite short, so 
that the time taken for printk doesn't disturb things too much.

I used
* "ei"/"li" for enter/leave if_cs_interrupt
* "ec"/"lc" for enter/leave if_cs_send_cmd
* "ep"/"lp" for enter/leave if_cs_receive_cmdres (p=resPonse)
* "et"/"lt" for enter/leave if_cs_send_data (t=Tx)
* "er"/"lr" for enter/leave if_cs_receive_data

Now, I see something strange happen:

[    7.563737] ec
[    7.565455]  cs 0x0005
[    7.570044]  lc

We enter if_cs_send_cmd() and check if I'm allowed to send a 
command by checking IF_CS_CARD_STATUS. I get 0x0005 back, which 
is IF_CS_BIT_COMMAND and IF_CS_BIT_TX, so I might either send a 
tx frame or send a command.

I do the latter and write IF_CS_BIT_COMMAND in both 
IF_CS_HOST_STATUS and IF_CS_HOST_IN_CAUSE. Then

[    7.571805] ei, hic 0x0008
[    7.574082] ep
[    7.575759]  lp
[    7.577511]  li

And sure enought, the if_cs_interrupt() get's called. 
IF_CS_CARD_INT_CAUSE is 0x0008 and this is IF_CS_BIT_RESP, so I 
can get my response back.

[    7.579410] ec
[    7.580024]  cs 0x0005
[    7.584767]  lc
[    7.630000] ei, hic 0x0008
[    7.630000] ep
[    7.630000]  lp
[    7.630000]  li

Here both steps from above happened again.

[    7.630000] ec
[    7.630000]  cs 0x0007
[    7.632436]  lc
[    7.960038] libertas: command 0x001f timed out
[    7.964568] libertas: requeueing command 0x001f due to timeout 
(#1)

And here I have the start of a problem. IF_CS_CARD_STATUS is 
suddenly 0x0007, which is IF_CS_BIT_TX, IF_CS_BIT_RX and 
IF_CS_BIT_COMMAND.

Not sure if the IF_CS_BIT_RX means that we could receive a frame 
now. And not sure why we didn't get a call into 
if_cs_interrupt() with (IF_CS_HOST_IN_CAUSE | IF_CS_BIT_RX) == 
true.


I also noticed that I sometimes use a 16 bit write to 
IF_CS_HOST_STATUS and sometimes an 8 bit write. We'll look into 
this more ...