[mipsel+rs780e]Occasionally "GPU lockup" after resuming from suspend.

[Michel Dänzer]

On Fre, 2011-12-16 at 16:42 +0800, chenhc at lemote.com wrote: 
> > On Don, 2011-12-08 at 19:35 +0800, chenhc at lemote.com wrote:
> >>
> >> I found CP_RB_WPTR has changed when "ring test failed", so I think CP is
> >> active, but what it get from ring buffer is wrong.
> >
> > CP_RB_WPTR is normally only changed by the CPU after adding commands to
> > the ring buffer, so I'm afraid that may not be a valid conclusion.
> >
> >
> I'm sorry, I've made a spelling mistake. In fact, CP_RB_RPTR and
> CP_RB_WPTR both changed, so I think CP is active.

I see. However, I think this actually makes it unlikely that the problem
is the CP reading wrong values from the ring, as otherwise the CP itself
would likely get stuck sooner or later.


> >> Then, I want to know whether there is a way to check the content that
> >> GPU get from ring buffer.
> >
> > See the r100_debugfs_cp_csq_fifo() function, which generates the output
> > for /sys/kernel/debug/dri/0/r100_cp_csq_fifo.
> >
> Hmmm, I don't think this function can be used by r600 (or write a similar
> one for R600), because I haven't found CSQ registers in r600 code.

Hmm yeah, looks like the registers for this have changed.


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer