[RFC][PATCH 1/2] drm/radeon: remove unneeded HDMI r/w ops on DCE4+

["Rafał Miłecki" <zajec5@gmail.com>]

Write to HDMI_VBI_PACKET_CONTROL was duplicated.
Writes to AFMT_AUDIO_CRC_CONTROL and AFMT_RAMP_CONTROL[0-3] came from
DCE2/3 code (copy & paste) and were never needed on DCE4+.

See https://bugzilla.kernel.org/show_bug.cgi?id=62591 for details.
---
That patches weren't tested with the HW, please don't apply them yet.
---
 drivers/gpu/drm/radeon/evergreen_hdmi.c |   11 -----------
 1 file changed, 11 deletions(-)

diff --git a/drivers/gpu/drm/radeon/evergreen_hdmi.c b/drivers/gpu/drm/radeon/evergreen_hdmi.c
index f71ce39..50f6299 100644
--- a/drivers/gpu/drm/radeon/evergreen_hdmi.c
+++ b/drivers/gpu/drm/radeon/evergreen_hdmi.c
@@ -257,11 +257,6 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
 	evergreen_audio_set_dto(encoder, mode->clock);
 
 	WREG32(HDMI_VBI_PACKET_CONTROL + offset,
-	       HDMI_NULL_SEND); /* send null packets when required */
-
-	WREG32(AFMT_AUDIO_CRC_CONTROL + offset, 0x1000);
-
-	WREG32(HDMI_VBI_PACKET_CONTROL + offset,
 	       HDMI_NULL_SEND | /* send null packets when required */
 	       HDMI_GC_SEND | /* send general control packets */
 	       HDMI_GC_CONT); /* send general control packets every frame */
@@ -349,12 +344,6 @@ void evergreen_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode
 
 	WREG32_OR(AFMT_AUDIO_PACKET_CONTROL + offset,
 		  AFMT_AUDIO_SAMPLE_SEND); /* send audio packets */
-
-	/* 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);
 }
 
 void evergreen_hdmi_enable(struct drm_encoder *encoder, bool enable)
-- 
1.7.10.4