[PATCH] drm/i915/ilk: Wait one vblank before enabling audio

Lyude
2016-05-20T21:36:40Z

We no longer call ilk_audio_codec_enable() while we have vblanks
disabled. As such, we can finally fix this and stop the occasional pipe
underruns I'm seeing on this Dell OptiPlex 990.

Cc: stable@vger.kernel.org
Signed-off-by: Lyude <cpaul@redhat.com>
---
drivers/gpu/drm/i915/intel_audio.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
index 7d281b4..0d685fe 100644
--- a/drivers/gpu/drm/i915/intel_audio.c
+++ b/drivers/gpu/drm/i915/intel_audio.c
@@ -423,12 +423,8 @@ static void ilk_audio_codec_enable(struct drm_connector *connector,
if (WARN_ON(port == PORT_A))
return;

- /*
- * FIXME: We're supposed to wait for vblank here, but we have vblanks
- * disabled during the mode set. The proper fix would be to push the
- * rest of the setup into a vblank work item, queued here, but the
- * infrastructure is not there yet.
- */
+ /* Need to wait one vblank before enabling audio */
+ intel_wait_for_vblank(connector->dev, pipe);

if (HAS_PCH_IBX(connector->dev)) {
hdmiw_hdmiedid = IBX_HDMIW_HDMIEDID(pipe);
--
2.5.5

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