[Bug 98797] [BXT/KBL] - HDMI - HD audio passthrough dont work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98797

--- Comment #93 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to chrisk2305 from comment #92)
> It is proven in this thread:
> https://forum.kodi.tv/showthread.php?tid=270298&page=95
> 
> All Windows Users can use HD Audio passthrough via the HDMI 2.0 (LSPCON)
> with FW 1.66.

I'll take your word for it, rather than go through 95 pages of forums... ugh.

---

Random debug note: We don't consider audio bandwidth requirements for link
training, only video mode. If the video mode just barely fits in the link, I
think it'll impact audio.

Quick hack to try:

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 76c8a0bd17f9..983e78b4dc18 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1713,6 +1713,9 @@ intel_dp_compute_config(struct intel_encoder *encoder,
                min_clock = max_clock;
        }

+       min_lane_count = max_lane_count;
+       min_clock = max_clock;
+
        for (; bpp >= 6*3; bpp -= 2*3) {
                mode_rate = intel_dp_link_required(adjusted_mode->crtc_clock,
                                                   bpp);

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