According to the bspec, when set M/N, should disable and enable transcoder which attaching DP audio. However the implementation will affect performance much more.
Therefore, only KBL changed to use automatic M/N. Testing: DP audio testing on SKL/KBL works (MP4, speaker test case). no audio delay in multiple resolution including 4K. Signed-off-by: Quanxian Wang <[email protected]> --- drivers/gpu/drm/i915/intel_audio.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c index d805b6e..ba4994e 100644 --- a/drivers/gpu/drm/i915/intel_audio.c +++ b/drivers/gpu/drm/i915/intel_audio.c @@ -289,6 +289,10 @@ hsw_dp_audio_config_update(struct intel_crtc *intel_crtc, enum port port, enum pipe pipe = intel_crtc->pipe; u32 tmp; + /* It doesn't work on KBL and uses automatic M/N. */ + if (IS_KABYLAKE(dev_priv)) + nm = NULL; + if (nm) DRM_DEBUG_KMS("using Maud %u, Naud %u\n", nm->m, nm->n); else -- 2.5.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
