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drm/msm: hot-plug fix for 6.4

Abhinav Kumar requested to merge abhinavk/msm:msm-fixes-abhinav into msm-fixes

Hi Rob

With https://patchwork.freedesktop.org/patch/514414/, hot-plug was broken on sc7180/sc7280 devices because the hpd_enable call which sets the internal_hpd flag to true was coming later than what the DP driver expected to setup the HPD block.

With this change, we align all HPD block handling to the hpd_enable/hpd_disable callbacks to address this timing issue and also better align with the upstream DRM fwk calls.

Thanks

Abhinav

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