diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c b/drivers/gpu/drm/i915/gt/intel_sseu.c
index 3a5db0dbac72..1505042d7b5d 100644
--- a/drivers/gpu/drm/i915/gt/intel_sseu.c
+++ b/drivers/gpu/drm/i915/gt/intel_sseu.c
@@ -33,9 +33,11 @@ intel_sseu_subslice_total(const struct sseu_dev_info *sseu)
 }
 
 void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int slice,
-			      u8 ss_mask)
+			      u32 ss_mask)
 {
-	sseu->subslice_mask[slice] = ss_mask;
+	int offset = slice * sseu->ss_stride;
+
+	memcpy(&sseu->subslice_mask[offset], &ss_mask, sseu->ss_stride);
 }
 
 unsigned int
diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.h b/drivers/gpu/drm/i915/gt/intel_sseu.h
index 7f600f50dedb..73a9064291a2 100644
--- a/drivers/gpu/drm/i915/gt/intel_sseu.h
+++ b/drivers/gpu/drm/i915/gt/intel_sseu.h
@@ -79,7 +79,7 @@ unsigned int
 intel_sseu_subslices_per_slice(const struct sseu_dev_info *sseu, u8 slice);
 
 void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int slice,
-			      u8 ss_mask);
+			      u32 ss_mask);
 
 u32 intel_sseu_make_rpcs(struct drm_i915_private *i915,
 			 const struct intel_sseu *req_sseu);