[Bug 69721] New: Can't reach maximum memory speed (or core speed) when using dpm=1 on r600g

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Sep 23 09:13:24 PDT 2013


          Priority: medium
            Bug ID: 69721
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Can't reach maximum memory speed (or core speed) when
                    using dpm=1 on r600g
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: alexandre.f.demers at gmail.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

After fixing bug 68235, it appears the maximum memory speed (or core speed)
can't always be reached. This situation depends on the voltage tweaking seen on
some cards. As an exemple, XFX HD-695X-ZNDC has the following maximum values:
max_sclk_vddc->80000, max_mclk_vddci->125000, max_mclk_vddc->125000.
However, the maximum memory clock value should be 130000 and the core clock
should be 83000.

As Alex Deucher explained: "This patch set works around the issue by limiting
the sclk and mclk to the highest levels listed in the clk/voltage dependency
tables.  I'll need to dig a bit more internally to try and figure out how to
handle these clks properly."

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