[Bug 42852] radeon driver (also ati driver) works only once.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=42852

--- Comment #3 from Alex Deucher <agd5f at yahoo.com> 2011-11-13 11:29:21 PST ---
(In reply to comment #2)
> Em Sáb, 2011-11-12 às 16:21 +0000, bugzilla-daemon at freedesktop.org
> escreveu:

> FreeBSD does not have KMS.. 
> On another notebook Radeon XPRESS 200M 5955 
> it works ok...
> 

That's a completely different chip that is supported properly with both UMS and
KMS.

> As I said in the bug report, the chip works very good Only after power
> on,
> and the driver "ati" or "radeon" is not aware of KMS either...
> 

There is very limited UMS support for your chip, but it's not nearly as robust
as the KMS support and there are no plans at the moment to do any more work on
UMS.

> Seems to me that the screen memory is not align propper with
> the registers on the chipset, a propper align situation  occurs only
> after power on,
> or after about 10 resets.. 
> 
> A propper reset or initial program in the chip (using the ati, or radeon
> driver)
> would resolve the problem...
> 
> Can someone please point me to a documentation of the radeon 6250 that
> explains how to reset the chip to power on state???

You can take a look at the KMS code and port the relevant changes to UMS.
http://cgit.freedesktop.org/~airlied/linux/tree/drivers/gpu/drm/radeon?h=drm-fixes
There isn't just a simple function to reset the chip, you need to reprogram the
memory controller, the display hardware, etc.
As your problem appears to be display related, I would take a look at the code
in atombios_encoders.c and atombios_crtc.c in KMS and compare it to the code in
atombios_output.c and atombios_crtc.c in the UMS tree.  Your chip is in the
PALM family and has a DCE4.1 based display block.

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