diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index a10e26380ef3d881a141d9923e16bcb8b844b1c8..e246e5cf758660bb7dda2bcd87b7f07c5f6e0174 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -973,10 +973,26 @@ unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
 	struct drm_i915_private *dev_priv = to_i915(fb->dev);
 
 	/* AUX_DIST needs only 4K alignment */
-	if ((DISPLAY_VER(dev_priv) < 12 && is_aux_plane(fb, color_plane)) ||
-	    is_ccs_plane(fb, color_plane))
+	if (is_ccs_plane(fb, color_plane))
 		return 4096;
 
+	if (is_semiplanar_uv_plane(fb, color_plane)) {
+		/*
+		 * TODO: cross-check wrt. the bspec stride in bytes * 64 bytes
+		 * alignment for linear UV planes on all platforms.
+		 */
+		if (DISPLAY_VER(dev_priv) >= 12) {
+			if (fb->modifier == DRM_FORMAT_MOD_LINEAR)
+				return intel_linear_alignment(dev_priv);
+
+			return intel_tile_row_size(fb, color_plane);
+		}
+
+		return 4096;
+	}
+
+	drm_WARN_ON(&dev_priv->drm, color_plane != 0);
+
 	switch (fb->modifier) {
 	case DRM_FORMAT_MOD_LINEAR:
 		return intel_linear_alignment(dev_priv);
@@ -985,19 +1001,12 @@ unsigned int intel_surf_alignment(const struct drm_framebuffer *fb,
 			return 256 * 1024;
 		return 0;
 	case I915_FORMAT_MOD_Y_TILED_GEN12_MC_CCS:
-		if (is_semiplanar_uv_plane(fb, color_plane))
-			return intel_tile_row_size(fb, color_plane);
-		fallthrough;
 	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS:
 	case I915_FORMAT_MOD_Y_TILED_GEN12_RC_CCS_CC:
 		return 16 * 1024;
 	case I915_FORMAT_MOD_Y_TILED_CCS:
 	case I915_FORMAT_MOD_Yf_TILED_CCS:
 	case I915_FORMAT_MOD_Y_TILED:
-		if (DISPLAY_VER(dev_priv) >= 12 &&
-		    is_semiplanar_uv_plane(fb, color_plane))
-			return intel_tile_row_size(fb, color_plane);
-		fallthrough;
 	case I915_FORMAT_MOD_Yf_TILED:
 		return 1 * 1024 * 1024;
 	default:
diff --git a/drivers/gpu/drm/i915/display/intel_fb.c b/drivers/gpu/drm/i915/display/intel_fb.c
index 0ec9ad7220a14b88b9513df9294c472b22f52b01..c8aaca3e79e97afa50505ff4f7e0e2e937050c49 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.c
+++ b/drivers/gpu/drm/i915/display/intel_fb.c
@@ -30,14 +30,6 @@ bool is_gen12_ccs_cc_plane(const struct drm_framebuffer *fb, int plane)
 	       plane == 2;
 }
 
-bool is_aux_plane(const struct drm_framebuffer *fb, int plane)
-{
-	if (is_ccs_modifier(fb->modifier))
-		return is_ccs_plane(fb, plane);
-
-	return plane == 1;
-}
-
 bool is_semiplanar_uv_plane(const struct drm_framebuffer *fb, int color_plane)
 {
 	return intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier) &&
diff --git a/drivers/gpu/drm/i915/display/intel_fb.h b/drivers/gpu/drm/i915/display/intel_fb.h
index 6acf792a8c44a2d82190b74e2795912428d2cb7a..13244ec1ad214356ecf3dfb9673e51bbaa4401ba 100644
--- a/drivers/gpu/drm/i915/display/intel_fb.h
+++ b/drivers/gpu/drm/i915/display/intel_fb.h
@@ -19,7 +19,6 @@ struct intel_plane_state;
 bool is_ccs_plane(const struct drm_framebuffer *fb, int plane);
 bool is_gen12_ccs_plane(const struct drm_framebuffer *fb, int plane);
 bool is_gen12_ccs_cc_plane(const struct drm_framebuffer *fb, int plane);
-bool is_aux_plane(const struct drm_framebuffer *fb, int plane);
 bool is_semiplanar_uv_plane(const struct drm_framebuffer *fb, int color_plane);
 
 bool is_surface_linear(const struct drm_framebuffer *fb, int color_plane);