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    SubjectRe: PCH reference clock cleanups
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    On Tue, 27 Sep 2011 10:01:33 +0100, Chris Wilson <chris@chris-wilson.co.uk> wrote:

    > Oddly in the diagram SSC4 is given as a 100MHz clock that can be used for
    > any output other than DP_A. However, the configuration register marks that
    > as being a test-only mode.

    Ok, it's all irrelevant -- the only configurations using anything other
    than a fixed 120MHz were eDP and LVDS. LVDS used a value from the BIOS, which is
    presumably always 120MHz. eDP ignored the refclk and used fixed PLL
    values.

    So, yes, we can always set the refclk to 120MHz; the cases which matter
    were using that value already.

    --
    keith.packard@intel.com
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