drm/i915/kbl+: Enable IPC only for symmetric memory configurations
IPC may cause underflows if not used with dual channel symmetric memory configuration. Disable IPC for non symmetric configurations in affected platforms. Display WA #1141 Changes Since V1: - Re-arrange the code. - update wrapper to return if memory is symmetric (Rodrigo) Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com> Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180824093225.12598-6-mahesh1.kumar@intel.com
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