Re: [PATCH v3 1/5] drm/i915: take display port power domain in DP HPD handler

[Jani Nikula <jani.nikula@linux.intel.com>]

Series pushed to -fixes, thanks for the patches and review.

BR,
Jani.


On Mon, 18 Aug 2014, Imre Deak <imre.deak@intel.com> wrote:
> Ville noticed that we can call ibx_digital_port_connected() which accesses
> the HW without holding any power well/runtime pm reference. Fix this by
> holding a display port power domain reference around the whole hpd_pulse
> handler.
>
> Signed-off-by: Imre Deak <imre.deak@intel.com>
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index ee3942f..a520188 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4037,15 +4037,21 @@ bool
>  intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  {
>  	struct intel_dp *intel_dp = &intel_dig_port->dp;
> +	struct intel_encoder *intel_encoder = &intel_dig_port->base;
>  	struct drm_device *dev = intel_dig_port->base.base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
> -	int ret;
> +	enum intel_display_power_domain power_domain;
> +	bool ret = true;
> +
>  	if (intel_dig_port->base.type != INTEL_OUTPUT_EDP)
>  		intel_dig_port->base.type = INTEL_OUTPUT_DISPLAYPORT;
>  
>  	DRM_DEBUG_KMS("got hpd irq on port %d - %s\n", intel_dig_port->port,
>  		      long_hpd ? "long" : "short");
>  
> +	power_domain = intel_display_port_power_domain(intel_encoder);
> +	intel_display_power_get(dev_priv, power_domain);
> +
>  	if (long_hpd) {
>  		if (!ibx_digital_port_connected(dev_priv, intel_dig_port))
>  			goto mst_fail;
> @@ -4061,8 +4067,7 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  
>  	} else {
>  		if (intel_dp->is_mst) {
> -			ret = intel_dp_check_mst_status(intel_dp);
> -			if (ret == -EINVAL)
> +			if (intel_dp_check_mst_status(intel_dp) == -EINVAL)
>  				goto mst_fail;
>  		}
>  
> @@ -4076,7 +4081,8 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  			drm_modeset_unlock(&dev->mode_config.connection_mutex);
>  		}
>  	}
> -	return false;
> +	ret = false;
> +	goto put_power;
>  mst_fail:
>  	/* if we were in MST mode, and device is not there get out of MST mode */
>  	if (intel_dp->is_mst) {
> @@ -4084,7 +4090,10 @@ mst_fail:
>  		intel_dp->is_mst = false;
>  		drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr, intel_dp->is_mst);
>  	}
> -	return true;
> +put_power:
> +	intel_display_power_put(dev_priv, power_domain);
> +
> +	return ret;
>  }
>  
>  /* Return which DP Port should be selected for Transcoder DP control */
> -- 
> 1.8.4
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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