David Eger wrote:

On Wed, Jun 16, 2004 at 08:24:15PM +0200, Jurriaan wrote:

quoted

The radeonfb driver in 2.6.7 produces some interesting artifacts on
scrolling, both scrolling horizontally and vertically.

The corruption you are talking about is, I believe, caused by a couple of things:

(1) we're not issuing enough fifo_wait()'s around our accel engine
    and pan register writes.
(2) there's some disconnect between writing to fb memory, panning, and
    copyarea()/fillrect() calls

I sent a hack of a fix for this to Ben a week ago, adding a call to radeonfb_sync()
at the end of radeonfb_copyarea() and radeonfb_fillrect().  This seems to fix the
problem for me, but you *shouldn't* have to do this.  

I haven't tracked it any further than this.  My next guess would be auditing register 
writes and making sure there are enough fifo_wait()'s...

Is this the case even with the off-by-one error in the bitblt code 
fixed?  In the 2.4 kernel, I got rid of all artifacts by fixing the 
off-by-one error.

In case, you don't know what I'm talking about, when you bitblt up or to 
the left on Radeon, x and y need to be adjusted by (w-1) and/or (h-1), 
respectively.  The code there, however, adjusted by w and/or h, which is 
off-by-one.



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