[Intel-gfx] [PATCH 04/11] drm/i915: Don't WARN on HDCP toggle if get_hw_state returns false

[Ville Syrjälä]

On Tue, Dec 03, 2019 at 12:36:27PM -0500, Sean Paul wrote:
> From: Sean Paul <seanpaul at chromium.org>
> 
> Now that we can rely on transcoder disable to toggle signalling off,
> it's less of a catastrophe if get_hw_state() returns false.
> 
> Once we enable MST, this will be a valid exit path and we want to make
> sure we're not spamming the logs needlessly.
> 
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index e8ac98a8ee7f..ca28913a4c9f 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1983,7 +1983,7 @@ int intel_ddi_toggle_hdcp_signalling(struct intel_encoder *intel_encoder,
>  	if (WARN_ON(!wakeref))
>  		return -ENXIO;
>  
> -	if (WARN_ON(!intel_encoder->get_hw_state(intel_encoder, &pipe))) {
> +	if (!intel_encoder->get_hw_state(intel_encoder, &pipe)) {

How can this get called when the encoder is not enabled?
Feels like this whole thing is trying to paper over some
bigger bug in the hdcp code.

>  		ret = -EIO;
>  		goto out;
>  	}
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS
> 
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-- 
Ville Syrjälä
Intel