[Bug 91871] link retraining for DP not possible with current design of Atomic modeset framework

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91871

            Bug ID: 91871
           Summary: link retraining for DP not possible with current
                    design of Atomic modeset framework
           Product: DRI
           Version: XOrg git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: General
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: sivakumar.thulasimani at intel.com

DP spec requires Link training from highest link rate supported by panel to
lowest link rate supported by panel. 

It is not possible to implement this in the current atomic modeset logic since
it splits modeset into two half atomic_check and atomic_commit, where it is
expected all values to be calculated in atomic_check and programmed in
atomic_commit. 

link training being a negotiation phase of DP modeset it is not possible to
predict if a training at certain link rate will succeed or not. if it does fail
it will require us to disable, calculate new values and enable pll. this is not
possible in current DRM Atomic modeset framework.

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