diff --git a/drivers/gpu/drm/radeon/dce3_1_afmt.c b/drivers/gpu/drm/radeon/dce3_1_afmt.c
index 07869ca8125d..cbd07f5f276a 100644
--- a/drivers/gpu/drm/radeon/dce3_1_afmt.c
+++ b/drivers/gpu/drm/radeon/dce3_1_afmt.c
@@ -266,12 +266,6 @@ void dce3_1_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *m
 	if (radeon_audio_set_avi_packet(encoder, mode) < 0)
 		return;
 
-	/* it's unknown what these bits do excatly, but it's indeed quite useful for debugging */
-	WREG32(HDMI0_RAMP_CONTROL0 + offset, 0x00FFFFFF);
-	WREG32(HDMI0_RAMP_CONTROL1 + offset, 0x007FFFFF);
-	WREG32(HDMI0_RAMP_CONTROL2 + offset, 0x00000001);
-	WREG32(HDMI0_RAMP_CONTROL3 + offset, 0x00000001);
-
 	r600_hdmi_audio_workaround(encoder);
 
 	/* enable audio after to setting up hw */
diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
index e240586ac42e..84a000d361e6 100644
--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
+++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
@@ -435,12 +435,6 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
 	if (radeon_audio_set_avi_packet(encoder, mode) < 0)
 		return;
 
-	/* it's unknown what these bits do excatly, but it's indeed quite useful for debugging */
-	WREG32(AFMT_RAMP_CONTROL0 + offset, 0x00FFFFFF);
-	WREG32(AFMT_RAMP_CONTROL1 + offset, 0x007FFFFF);
-	WREG32(AFMT_RAMP_CONTROL2 + offset, 0x00000001);
-	WREG32(AFMT_RAMP_CONTROL3 + offset, 0x00000001);
-
 	/* enable audio after to setting up hw */
 	radeon_audio_enable(rdev, dig->afmt->pin, 0xf);
 }
diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index 8955efa01514..0f90d70537e9 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -433,12 +433,6 @@ void r600_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mod
 	if (radeon_audio_set_avi_packet(encoder, mode) < 0)
 		return;
 
-	/* it's unknown what these bits do excatly, but it's indeed quite useful for debugging */
-	WREG32(HDMI0_RAMP_CONTROL0 + offset, 0x00FFFFFF);
-	WREG32(HDMI0_RAMP_CONTROL1 + offset, 0x007FFFFF);
-	WREG32(HDMI0_RAMP_CONTROL2 + offset, 0x00000001);
-	WREG32(HDMI0_RAMP_CONTROL3 + offset, 0x00000001);
-
 	/* enable audio after to setting up hw */
 	radeon_audio_enable(rdev, dig->afmt->pin, 0xf);
 }