[Intel-gfx] [PATCH] drm/i915/audio: Hook up component bindings even if displays are disabled

[Imre Deak]

On Fri, Aug 17, 2018 at 11:02:41AM +0100, Chris Wilson wrote:
> If the display has been disabled by modparam, we still want to connect
> together the HW bits and bobs with the associated drivers so that we can
> continue to manage their runtime power gating.
> 
> Fixes: 108109444ff6 ("drm/i915: Check num_pipes before initializing audio component")
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Imre Deak <imre.deak at intel.com>
> Cc: Takashi Iwai <tiwai at suse.de>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: Elaine Wang <elaine.wang at intel.com>

Going through the hooks in i915_audio_component_ops, I haven't noticed
anything that would actually go wrong with num_pipes=0. Besides some
audio HW register programming from i915_audio_component_codec_wake_override(),
we'd skip doing everything else due to not reporting any active encoders
to the audio component (as we do during normal display modeset). So

Reviewed-by: Imre Deak <imre.deak at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_audio.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_audio.c b/drivers/gpu/drm/i915/intel_audio.c
> index b725835b47ef..769f3f586661 100644
> --- a/drivers/gpu/drm/i915/intel_audio.c
> +++ b/drivers/gpu/drm/i915/intel_audio.c
> @@ -962,9 +962,6 @@ void i915_audio_component_init(struct drm_i915_private *dev_priv)
>  {
>  	int ret;
>  
> -	if (INTEL_INFO(dev_priv)->num_pipes == 0)
> -		return;
> -
>  	ret = component_add(dev_priv->drm.dev, &i915_audio_component_bind_ops);
>  	if (ret < 0) {
>  		DRM_ERROR("failed to add audio component (%d)\n", ret);
> -- 
> 2.18.0
>