Re: [PATCH] drm/i915: Get audio power domain during initial hw readout

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Apr 12, 2016 at 03:52:48PM -0700, Bob Paauwe wrote:
> if the crtc has audio is enabled. Otherwise, when the first atomic
> modeset happens it will warn when trying to drop the audio power
> domain.
> 
> Signed-off-by: Bob Paauwe <bob.j.paauwe@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_display.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 5155efb6..caeb3e1 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -10561,6 +10561,7 @@ found:
>  	}
>  
>  	ret = intel_modeset_setup_plane_state(state, crtc, mode, fb, 0, 0);
> +
>  	if (ret)
>  		goto fail;
>  
> @@ -15998,6 +15999,10 @@ static void intel_modeset_readout_hw_state(struct drm_device *dev)
>  
>  		memset(&crtc->base.mode, 0, sizeof(crtc->base.mode));
>  		if (crtc->base.state->active) {
> +			if (crtc->config->has_audio)
> +				intel_display_power_get(dev_priv,
> +							POWER_DOMAIN_AUDIO);
> +

Hmm. Ideally we would do this alongside the other power doamin stuff in
intel_modeset_setup_hw_state(), but that's too late for
intel_sanitize_{crtc,encoder}(). So I guess we'll have to do it before
those, or we have to pull the audio power domain stuff out from the
encoder hooks. Or perhaps even throw it out entirely, since I'm not sure
it's doing anything for us.

If we do leave the power domain handling in the encoder hooks, then
this is not quite the right place to grab the reference. We could have
an encoder enabled w/o an active pipe, in which case
intel_sanitize_encoder() would shut off the encoder, so we'd still end
up with a bad refcount.

>  			intel_mode_from_pipe_config(&crtc->base.mode, crtc->config);
>  			intel_mode_from_pipe_config(&crtc->base.state->adjusted_mode, crtc->config);
>  			WARN_ON(drm_atomic_set_mode_for_crtc(crtc->base.state, &crtc->base.mode));
> -- 
> 2.5.5
> 
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-- 
Ville Syrjälä
Intel OTC
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