diff --git a/src/amd/compiler/aco_validate.cpp b/src/amd/compiler/aco_validate.cpp
index 420035e4583..720a97cc244 100644
--- a/src/amd/compiler/aco_validate.cpp
+++ b/src/amd/compiler/aco_validate.cpp
@@ -480,19 +480,22 @@ validate_ir(Program* program)
                   const_bus_limit = 2;
 
                uint32_t scalar_mask;
-               if (instr->isVOP3() || instr->isVOP3P() || instr->isVINTERP_INREG())
+               if (instr->isVOP3() || instr->isVOP3P())
                   scalar_mask = 0x7;
                else if (instr->isSDWA())
                   scalar_mask = program->gfx_level >= GFX9 ? 0x7 : 0x4;
-               else if (instr->isDPP())
-                  scalar_mask = 0x4;
                else if (instr->opcode == aco_opcode::v_movrels_b32 ||
                         instr->opcode == aco_opcode::v_movrelsd_b32 ||
                         instr->opcode == aco_opcode::v_movrelsd_2_b32)
                   scalar_mask = 0x2;
+               else if (instr->isVINTERP_INREG())
+                  scalar_mask = 0x0;
                else
                   scalar_mask = 0x5;
 
+               if (instr->isDPP())
+                  scalar_mask &= 0x4; /* TODO 0x6 for GFX11.5+ */
+
                if (instr->isVOPC() || instr->opcode == aco_opcode::v_readfirstlane_b32 ||
                    instr->opcode == aco_opcode::v_readlane_b32 ||
                    instr->opcode == aco_opcode::v_readlane_b32_e64 ||