diff --git a/spi.cpp b/spi.cpp
index 541718b..59b1bfa 100644
--- a/spi.cpp
+++ b/spi.cpp
@@ -8,7 +8,6 @@
 #define SSPI_FPGA_EN (1<<18)
 #define SSPI_OSD_EN  (1<<19)
 #define SSPI_IO_EN   (1<<20)
-#define SSPI_DM_EN   (1<<21)
 
 #define SWAPW(a) ((((a)<<8)&0xff00)|(((a)>>8)&0x00ff))
 
@@ -106,16 +105,6 @@ void DisableIO()
 	spi_en(SSPI_IO_EN, 0);
 }
 
-void EnableDMode()
-{
-	spi_en(SSPI_DM_EN, 1);
-}
-
-void DisableDMode()
-{
-	spi_en(SSPI_DM_EN, 0);
-}
-
 uint8_t spi_in()
 {
 	return spi_b(0);
diff --git a/spi.h b/spi.h
index 4dc7a7d..7a1e5ad 100644
--- a/spi.h
+++ b/spi.h
@@ -15,8 +15,6 @@ void EnableFpga();
 void DisableFpga();
 void EnableOsd();
 void DisableOsd();
-void EnableDMode();
-void DisableDMode();
 void EnableIO();
 void DisableIO();