drm/radeon: fix up audio dto programming for DCE2

Uses a different register than DCE3 asics.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/r600_hdmi.c

@@ -246,9 +246,18 @@ void r600_audio_set_dto(struct drm_encoder *encoder, u32 clock)
 	 * number (coefficient of two integer numbers.  DCCG_AUDIO_DTOx_PHASE
 	 * is the numerator, DCCG_AUDIO_DTOx_MODULE is the denominator
 	 */
-	WREG32(DCCG_AUDIO_DTO0_PHASE, (base_rate*50) & 0xffffff);
-	WREG32(DCCG_AUDIO_DTO0_MODULE, (clock*100) & 0xffffff);
+	if (ASIC_IS_DCE3(rdev)) {
+		/* according to the reg specs, this should DCE3.2 only, but in
+		 * practice it seems to cover DCE3.0 as well.
+		 */
+		WREG32(DCCG_AUDIO_DTO0_PHASE, base_rate * 50);
+		WREG32(DCCG_AUDIO_DTO0_MODULE, clock * 100);
 		WREG32(DCCG_AUDIO_DTO_SELECT, 0); /* select DTO0 */
+	} else {
+		/* according to the reg specs, this should be DCE2.0 and DCE3.0 */
+		WREG32(AUDIO_DTO, AUDIO_DTO_PHASE(base_rate * 50) |
+		       AUDIO_DTO_MODULE(clock * 100));
+	}
 }
 
 /*

drivers/gpu/drm/radeon/r600d.h

@@ -910,7 +910,12 @@
 #       define TARGET_LINK_SPEED_MASK                     (0xf << 0)
 #       define SELECTABLE_DEEMPHASIS                      (1 << 6)
 
-/* Audio clocks */
+/* Audio clocks DCE 2.0/3.0 */
+#define AUDIO_DTO                         0x7340
+#       define AUDIO_DTO_PHASE(x)         (((x) & 0xffff) << 0)
+#       define AUDIO_DTO_MODULE(x)        (((x) & 0xffff) << 16)
+
+/* Audio clocks DCE 3.2 */
 #define DCCG_AUDIO_DTO0_PHASE             0x0514
 #define DCCG_AUDIO_DTO0_MODULE            0x0518
 #define DCCG_AUDIO_DTO0_LOAD              0x051c