[Bug 112212] Commit 0c06fa15600 (Add support of BT.2020 Colorimetry to DP MSA) causing 4K monitor corruption

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112212

--- Comment #4 from Mun, Gwan-gyeong <elongbug at gmail.com> ---
Hi Ken,
I am Gwan-gyeong aka. G.G.

Can you check with your drm-tip includes this commit or not?

ommit d4a415dcda35d298b0048eb9c1a9bc04a5007fe0
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date:   Tue Oct 15 22:05:38 2019 +0300

    drm/i915: Fix MST oops due to MSA changes

    The MSA MISC computation now depends on the connector state, and
    we do it from the DDI .pre_enable() hook. All that is fine for
    DP SST but with MST we don't actually pass the connector state
    to the dig port's .pre_enable() hook which leads to an oops.

    Need to think more how to solve this in a cleaner fashion, but
    for now let's just add a NULL check to stop the oopsing.

    Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
    Cc: Uma Shankar <uma.shankar at intel.com>
    Fixes: 0c06fa156006 ("drm/i915/dp: Add support of BT.2020 Colorimetry to DP
MSA")
    Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20191015190538.27539-1-ville.syrjala@linux.intel.com
    Reviewed-by: Uma Shankar <uma.shankar at intel.com>
    Reviewed-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>

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