Re: [Linux-fbdev-devel] Re: [Dri-devel] Rage128 and Radeon patches

[Alex Deucher <agd5f@yahoo.com>]

I haven't tried multiple radeon cards, but I seem to recall several
people having this problem right around when 4.3.0 was released.  I
don't think a "proper" fix ever went in and I think the issue was to be
revisited later.  I don't know if it's needed anymore or not.

Alex

--- Jon Smirl <jonsmirl@yahoo.com> wrote:
> --- Alex Deucher <agd5f@yahoo.com> wrote:
> > > 2) access ROM directly instead of relying on copy
> > > in low RAM. This allows multiple cards. Required
> > > MPP_TB_CONFIG fix in driver.
> > 
> > Is this patch necessary for xfree86?  It may address
> > some of the issues
> > in the email threads I sent out yesterday (ie,
> > problems with multiple
> > radeon cards and xfree86).  if so would you consider
> > making one?
> > 
> 
> Xfree code does not have the patch, but is Xfree
> experiencing the bug? Xfree accesses the hardware very
> differently than the framebuffer drivers.
> 
> I suspect that you would see this problem if you were
> using something else for your primary video and a
> Radeon for secondary. The first time you ran Xfree it
> would work. But when you exited and restarted Xfree it
> would hang when starting the secondary display.
> 
> Where does XFree reset the secondary card? The code
> below needs to run right after the reset in the radeon
> driver. I added it to my Rage128 driver too but I have
> not observed the problem with them.
> 
> Framebuffer code is different and triggers the bug the
> first time the secondary display is accessed.
> 
> /* Fix from ATI for problem with Radeon hardware not
> leaving ROM enabled */
> unsigned int temp;
> temp = INREG(RADEON_MPP_TB_CONFIG);
> temp &= 0x00ffffffu;
> temp |= 0x04 << 24;
> OUTREG(RADEON_MPP_TB_CONFIG, temp);
> temp = INREG(RADEON_MPP_TB_CONFIG);
> 
> 
> =====
> Jon Smirl
> jonsmirl@yahoo.com
> 

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