radeon driver: checkpoint

Matthieu Herrb matthieu.herrb at laas.fr
Mon Apr 24 14:18:35 PDT 2006

Benjamin Herrenschmidt wrote:
>>>     save->bus_cntl           = INREG(RADEON_BUS_CNTL);
>>> to it ?
>> Done, but it doesn't help.
> Ok, that isn't your problem but still needs to be fixed :)
>>> Also, I spotted:
>>> -CRTC_EXT_CNTL (0054)   0x00008048
>>> +CRTC_EXT_CNTL (0054)   0x00000048
>>> RADEON_CRTC_CRT_ON is clear here, that means that the CRT is off, is
>>> that expected ?  (That is, your primary head is a flat panel ?
>> My primary head is a flat panel connected to the DVI connector of the 
>> card, the 2nd head is connected to the analog 15 pins VGA connector.
>>> Does it
>>> "fixes" your problem if you use radeontool to dynamically "fix" the
>>> value to 0x8048 (radeontool regset CRTC_EXT_CNTL 0x8048)
>> With the above patch in place, this activates the video signal on the 
>> 2nd head, and it displays screen 1 as expected.
> Ok. So the problem is that your second head is driven by the primary
> analog output... interesting. I'll have to dive into the old driver code
> to understand why that worked before and not with 7.0. It's definitely
> not a regression caused by my memory map patches, more yet another case
> of weird CRTC<->output wiring that got broken during the 6.8 -> 7.0
> cycle by various other updates. From a very quick look at the code, it
> can't work indeed.
> I'll have a deeper look as soon as I find some time. I'm fairly busy at
> the moment so if Alex wants to give it a go, feel free :)


Just to confirm that your recent commit does indeed fix the problem for me.
Matthieu Herrb

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