drm/radeon/audio: don't hardcode CRTC id

This is based on info released by AMD, should allow using audio in much
more cases.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/r600_audio.c b/drivers/gpu/drm/radeon/r600_audio.c
index 7c4fa77f018f..7479a5c503e4 100644
--- a/drivers/gpu/drm/radeon/r600_audio.c
+++ b/drivers/gpu/drm/radeon/r600_audio.c
@@ -192,6 +192,7 @@ void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
         struct radeon_device *rdev = dev->dev_private;
         struct radeon_encoder *radeon_encoder = to_radeon_encoder(encoder);
         struct radeon_encoder_atom_dig *dig = radeon_encoder->enc_priv;
+        struct radeon_crtc *radeon_crtc = to_radeon_crtc(encoder->crtc);
         int base_rate = 48000;
 
         switch (radeon_encoder->encoder_id) {
@@ -217,8 +218,8 @@ void r600_audio_set_clock(struct drm_encoder *encoder, int clock)
                 WREG32(EVERGREEN_AUDIO_PLL1_DIV, clock * 10);
                 WREG32(EVERGREEN_AUDIO_PLL1_UNK, 0x00000071);
 
-                /* Some magic trigger or src sel? */
-                WREG32_P(0x5ac, 0x01, ~0x77);
+                /* Select DTO source */
+                WREG32(0x5ac, radeon_crtc->crtc_id);
         } else {
                 switch (dig->dig_encoder) {
                 case 0: