1 files changed, 12 insertions, 0 deletions

diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index c8c92757a..5d516cdb3 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -329,6 +329,10 @@ void Maxwell3D::CallMethod(const GPU::MethodCall& method_call) {
         ProcessMacroBind(method_call.argument);
         break;
     }
+    case MAXWELL3D_REG_INDEX(firmware[4]): {
+        ProcessFirmwareCall4();
+        break;
+    }
     case MAXWELL3D_REG_INDEX(const_buffer.cb_data[0]):
     case MAXWELL3D_REG_INDEX(const_buffer.cb_data[1]):
     case MAXWELL3D_REG_INDEX(const_buffer.cb_data[2]):
@@ -419,6 +423,14 @@ void Maxwell3D::ProcessMacroBind(u32 data) {
     macro_positions[regs.macros.entry++] = data;
 }
 
+void Maxwell3D::ProcessFirmwareCall4() {
+    LOG_WARNING(HW_GPU, "(STUBBED) called");
+
+    // Firmware call 4 is a blob that changes some registers depending on its parameters.
+    // These registers don't affect emulation and so are stubbed by setting 0xd00 to 1.
+    regs.reg_array[0xd00] = 1;
+}
+
 void Maxwell3D::ProcessQueryGet() {
     const GPUVAddr sequence_address{regs.query.QueryAddress()};
     // Since the sequence address is given as a GPU VAddr, we have to convert it to an application