[deathsimple/drm-next-3.16][2/4] drm/radeon/hdmi: DCE3: clean ACR control

["Rafał Miłecki" <zajec5@gmail.com>]

What initially seemed to be a typo in fglrx (using register 0x740c
instead of 74dc) appeared to be a correct behavior. Without this
0x740c reg operation DCE 3 doesn't work and it seems we got code for
that already in place.
Recent RE effors allowed to finally understand this magic:
WREG32(HDMI0_AUDIO_CRC_CONTROL + offset, 0x1000);

This has been tested for possible regressions on DCE3 HD3470 (RV620).

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
---
 drivers/gpu/drm/radeon/r600_hdmi.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/r600_hdmi.c b/drivers/gpu/drm/radeon/r600_hdmi.c
index b8b2efa..d4c13a0 100644
--- a/drivers/gpu/drm/radeon/r600_hdmi.c
+++ b/drivers/gpu/drm/radeon/r600_hdmi.c
@@ -332,6 +332,7 @@ void r600_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mod
 	u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
 	struct hdmi_avi_infoframe frame;
 	uint32_t offset;
+	uint32_t acr_ctl;
 	ssize_t err;
 
 	if (!dig || !dig->afmt)
@@ -351,15 +352,15 @@ void r600_hdmi_setmode(struct drm_encoder *encoder, struct drm_display_mode *mod
 	WREG32(HDMI0_VBI_PACKET_CONTROL + offset,
 	       HDMI0_NULL_SEND); /* send null packets when required */
 
-	WREG32(HDMI0_AUDIO_CRC_CONTROL + offset, 0x1000);
-
 	WREG32(HDMI0_AUDIO_PACKET_CONTROL + offset,
 	       HDMI0_AUDIO_SAMPLE_SEND | /* send audio packets */
 	       HDMI0_AUDIO_DELAY_EN(1) | /* default audio delay */
 	       HDMI0_AUDIO_PACKETS_PER_LINE(3) | /* should be suffient for all audio modes and small enough for all hblanks */
 	       HDMI0_60958_CS_UPDATE); /* allow 60958 channel status fields to be updated */
 
-	WREG32(HDMI0_ACR_PACKET_CONTROL + offset,
+	/* DCE 3.0 uses register that's normally for CRC_CONTROL */
+	acr_ctl = ASIC_IS_DCE3(rdev) ? 0x740c : HDMI0_ACR_PACKET_CONTROL;
+	WREG32(acr_ctl + offset,
 	       HDMI0_ACR_SOURCE | /* select SW CTS value - XXX verify that hw CTS works on all families */
 	       HDMI0_ACR_AUTO_SEND); /* allow hw to sent ACR packets when required */
 
-- 
1.8.4.5

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