[Bug 5147] New: r300EmitWait emits a wait that's less strong than we want

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https://bugs.freedesktop.org/show_bug.cgi?id=5147          
     
           Summary: r300EmitWait emits a wait that's less strong than we
                    want
           Product: Mesa
           Version: CVS
          Platform: Other
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Drivers/DRI/r300
        AssignedTo: dri...@li...
        ReportedBy: anholt@FreeBSD.org


While looking into an issue that this report ended up being unrelated to, I
noticed that r300EmitWait handling is bad.  Assuming the r300 is like the
previous Radeons (which the limited specs, and the fact that it's the same
register and values as previous Radeons suggests), we need to be doing
_IDLECLEAN, not _IDLE.  The issue being that the caches for the different
pipelines are not coherent, so you need to flush when switching which one is
active.  I don't think there's any circumstance where we would want to do plain
_IDLE, so we should probably change it back to be like r200's interface to these
regs.  If this is an issue, it would manifest as small rendering glitches with
active texture uploading, most likely.          
     
     
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