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Stolen memory is not usable for MTL A0 stepping beyond certain access size and we have no control over userspace access size of /dev/fb which can be backed by stolen memory. So disable stolen memory backed fb by setting i915->dsm.usable_size to zero. v2: remove hsdes reference and fix commit message(Andi) v3: use revid as we want to target SOC stepping(Radhakrishna) Cc: Matthew Auld <matthew.auld@intel.com> Cc: Andi Shyti <andi.shyti@linux.intel.com> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Signed-off-by: Nirmoy Das <nirmoy.das@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230404181342.23362-1-nirmoy.das@intel.com