[Bug 43191] New: AMD E-350 needs 2D (MACRO) color tiling to perform well, but fully enabling it results in scanout corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=43191

             Bug #: 43191
           Summary: AMD E-350 needs 2D (MACRO) color tiling to perform
                    well, but fully enabling it results in scanout
                    corruption
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: simon.farnsworth at onelan.co.uk
         QAContact: xorg-team at lists.x.org


Created attachment 53797
  --> https://bugs.freedesktop.org/attachment.cgi?id=53797
Patch to enable color tiling on Evergreen.

I'm trying to get AMD E-350 graphics performance up to the level I experience
on Intel Pineview (open source drivers in both cases), and I hit performance
issues with blits.

On #radeon IRC, rak_adam confirmed via compute shaders that I should be able to
achieve the blit speed I achieve on Intel (he measured around 7 GBit/s, I need
around 4GBit/s).

At agd5f's suggestion, I've enabled Mesa-side tiling with the R600_TILING
environment variable. I've used the attached patch (written by Alex, but
completely untested by him) to get the DDX to do tiling as well, but this
results in corrupted scanout.

I'm using Linux kernel 3.1.0. I'm going to dig into this myself, and see if I
can find a fix.

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