[Intel-gfx] [PATCH] drm/i915: Initialize audio only when display is present

[Mika Kahola]

At least in Coffee Lake it happens that we start initiliazing audio when
no display is connected. This was discovered by CI when running IGT test
case

drv_module_reload --r basic-no-display

The issue here is that the 'intel_device_info_runtime_init()' sets
num_pipes to 0 but before this happens the audio part has already started
to initialize itself. Later on the num_pipes is updated to 0 in
intel_device_info_runtime_init() and we hit that when audio part is digging
out ELD. This causes a warning in dmesg. To fix this issue, let's register
the audio driver only in a case when display is enabled.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103206
Signed-off-by: Mika Kahola <mika.kahola at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index e7e9e06..f3cee1b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1243,7 +1243,8 @@ static void i915_driver_register(struct drm_i915_private *dev_priv)
 	if (IS_GEN5(dev_priv))
 		intel_gpu_ips_init(dev_priv);
 
-	intel_audio_init(dev_priv);
+	if (!i915_modparams.disable_display)
+		intel_audio_init(dev_priv);
 
 	/*
 	 * Some ports require correctly set-up hpd registers for detection to
-- 
2.7.4