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MST master can not be disabled while it have attached MST slaves, so it is necessary force a modeset in all of its slaves. v3: - moved handling to intel_atomic_check() this way is guarantee that all pipes will have its state computed v4: - added a function to return if MST master neeeds modeset to simply code in intel_atomic_check() v5: - fixed and moved code to check if MST master needs a modeset v6: - previons version of this patch was split into two patches Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191223010654.67037-6-jose.souza@intel.com