drm/asahi: g17: identify the M5 Max 27.3 (26C5035r) firmware (on #1173)

drivers/gpu/drm/asahi/fwid.rs

@@ -554,6 +554,29 @@ mod tests {
         }
     }
 
+    #[test]
+    fn m5_pro_builds_name_their_layouts() {
+        use crate::g17::fw::variant::{Firmware, M5Layouts};
+        let Firmware::Identified(builds) = crate::hw::t6050::CONFIG.firmware else {
+            panic!("the M5 Pro must identify its loaded firmware");
+        };
+        for (i, build) in builds.iter().enumerate() {
+            // 27.2 (26B123) moved the InitData layouts; 27.3 beta 1 (26C5035r) also moved
+            // the HW data.
+            let layouts = if build.os_version >= [27, 3, 0] {
+                M5Layouts::V26C5035
+            } else if build.os_version >= [27, 2, 0] {
+                M5Layouts::V26B123
+            } else {
+                M5Layouts::V26A428
+            };
+            assert_eq!(build.variant.m5_layouts, Some(layouts));
+            for other in &builds[i + 1..] {
+                assert_ne!(build.images[0].text_sha256, other.images[0].text_sha256);
+            }
+        }
+    }
+
     fn t6050_admits_only(builds: &[crate::g17::fw::variant::Build]) {
         for image in builds.iter().flat_map(|build| build.images) {
             // Both roles' records, inside TEXT.