MTL supports RGB16161616_64B FP16 format which is a binary
floating-point computer number format that occupies 16 bits
in computer memory.

This was tested with kernel patch,
https://patchwork.freedesktop.org/series/124957/
https://lore.kernel.org/all/20231201091133.23508-1-melanie.lobo@intel.com/

cc: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
cc: Bhanuprakash Modem <bhanuprakash.modem@intel.com>
cc: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Melanie Lobo <melanie.lobo@intel.com>
---
 lib/intel_aux_pgtable.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/intel_aux_pgtable.c b/lib/intel_aux_pgtable.c
index 3cbb0e26f35c..87df50e71bbd 100644
--- a/lib/intel_aux_pgtable.c
+++ b/lib/intel_aux_pgtable.c
@@ -22,6 +22,7 @@
 #define AUX_FORMAT_AYUV		0x09
 #define AUX_FORMAT_ARGB_8B	0x0A
 #define AUX_FORMAT_NV12_21	0x0F
+#define AUX_FORMAT_RGBA16_FLOAT        0x1
 
 struct pgtable_level_desc {
 	int idx_shift;
@@ -306,6 +307,10 @@ static uint64_t pgt_get_l1_flags(const struct intel_buf *buf, int surface_idx)
 			entry.e.format = AUX_FORMAT_ARGB_8B;
 			entry.e.depth = bpp_to_depth_val(32);
 			break;
+		case 64:
+			entry.e.format = AUX_FORMAT_RGBA16_FLOAT;
+			entry.e.depth = bpp_to_depth_val(64);
+			break;
 		default:
 			igt_assert(0);
 		}
-- 
2.17.1