diff --git a/src/gallium/drivers/iris/iris_formats.c b/src/gallium/drivers/iris/iris_formats.c
index f6344cc7543..a35b663a53c 100644
--- a/src/gallium/drivers/iris/iris_formats.c
+++ b/src/gallium/drivers/iris/iris_formats.c
@@ -338,9 +338,13 @@ iris_format_for_usage(const struct gen_device_info *devinfo,
                       isl_surf_usage_flags_t usage)
 {
    enum isl_format format = iris_isl_format_for_pipe_format(pformat);
-   const struct isl_format_layout *fmtl = isl_format_get_layout(format);
    struct isl_swizzle swizzle = ISL_SWIZZLE_IDENTITY;
 
+   if (format == ISL_FORMAT_UNSUPPORTED)
+      return (struct iris_format_info) { .fmt = format, .swizzle = swizzle };
+
+   const struct isl_format_layout *fmtl = isl_format_get_layout(format);
+
    if (!util_format_is_srgb(pformat)) {
       if (util_format_is_intensity(pformat)) {
          swizzle = ISL_SWIZZLE(RED, RED, RED, RED);
diff --git a/src/gallium/drivers/iris/iris_resource.c b/src/gallium/drivers/iris/iris_resource.c
index bdd715df2c9..7ca6097840a 100644
--- a/src/gallium/drivers/iris/iris_resource.c
+++ b/src/gallium/drivers/iris/iris_resource.c
@@ -85,7 +85,8 @@ modifier_is_supported(const struct gen_device_info *devinfo,
 
       enum isl_format linear_format = isl_format_srgb_to_linear(rt_format);
 
-      if (!isl_format_supports_ccs_e(devinfo, linear_format))
+      if (linear_format == ISL_FORMAT_UNSUPPORTED ||
+          !isl_format_supports_ccs_e(devinfo, linear_format))
          return false;
 
       return devinfo->gen >= 9 && devinfo->gen <= 11;