Re: [PATCH 3/5] drm/i915/dp: Remove intel_dp->detect_done flag

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

On Tue, Sep 18, 2018 at 12:20:07AM -0700, Dhinakaran Pandiyan wrote:
> The intel_dp->detect_done flag is no more useful. Pull
> intel_dp_long_pulse() into the lone caller,
> 
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c  | 63 +++++++++++++---------------------------
>  drivers/gpu/drm/i915/intel_drv.h |  1 -
>  2 files changed, 20 insertions(+), 44 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 8bf9afa5683c..d06bf4303814 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5012,13 +5012,25 @@ intel_dp_unset_edid(struct intel_dp *intel_dp)
>  }
>  
>  static int
> -intel_dp_long_pulse(struct intel_connector *connector,
> -		    struct drm_modeset_acquire_ctx *ctx)
> +intel_dp_detect(struct drm_connector *connector,
> +		struct drm_modeset_acquire_ctx *ctx,
> +		bool force)
>  {
> -	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> -	struct intel_dp *intel_dp = intel_attached_dp(&connector->base);
> -	enum drm_connector_status status;
> +	struct drm_i915_private *dev_priv = to_i915(connector->dev);
> +	struct intel_dp *intel_dp = intel_attached_dp(connector);
> +	int status;
>  	u8 sink_irq_vector = 0;
> +	struct drm_crtc *crtc;
> +
> +	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
> +		      connector->base.id, connector->name);
> +
> +	crtc = connector->state->crtc;
> +	if (crtc) {
> +		status = drm_modeset_lock(&crtc->mutex, ctx);

The 'status' name looks a bit weird here. I'm leaning towards keeping
the 'int ret' for this case.

Hmm. Actually, why are we even taking this lock here anyway? I would
imagine we only need it for the link retraining and 
intel_dp_retrain_link() already grabs it so we should be able to
just drop this code. Would allow page flips and detect to execute
in parallel again.

> +		if (status)
> +			return status;
> +	}
>  
>  	WARN_ON(!drm_modeset_is_locked(&dev_priv->drm.mode_config.connection_mutex));
>  
> @@ -5093,9 +5105,9 @@ intel_dp_long_pulse(struct intel_connector *connector,
>  	intel_dp->aux.i2c_defer_count = 0;
>  
>  	intel_dp_set_edid(intel_dp);
> -	if (intel_dp_is_edp(intel_dp) || connector->detect_edid)
> +	if (intel_dp_is_edp(intel_dp) ||
> +	    to_intel_connector(connector)->detect_edid)
>  		status = connector_status_connected;
> -	intel_dp->detect_done = true;
>  
>  	/* Try to read the source of the interrupt */
>  	if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11 &&
> @@ -5120,37 +5132,6 @@ intel_dp_long_pulse(struct intel_connector *connector,
>  	return status;
>  }
>  
> -static int
> -intel_dp_detect(struct drm_connector *connector,
> -		struct drm_modeset_acquire_ctx *ctx,
> -		bool force)
> -{
> -	struct intel_dp *intel_dp = intel_attached_dp(connector);
> -	int status = connector->status;
> -
> -	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
> -		      connector->base.id, connector->name);
> -
> -	/* If full detect is not performed yet, do a full detect */
> -	if (!intel_dp->detect_done) {
> -		struct drm_crtc *crtc;
> -		int ret;
> -
> -		crtc = connector->state->crtc;
> -		if (crtc) {
> -			ret = drm_modeset_lock(&crtc->mutex, ctx);
> -			if (ret)
> -				return ret;
> -		}
> -
> -		status = intel_dp_long_pulse(intel_dp->attached_connector, ctx);
> -	}
> -
> -	intel_dp->detect_done = false;
> -
> -	return status;
> -}
> -
>  static void
>  intel_dp_force(struct drm_connector *connector)
>  {
> @@ -5643,7 +5624,6 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  
>  	if (long_hpd) {
>  		intel_dp->reset_link_params = true;
> -		intel_dp->detect_done = false;
>  		return IRQ_NONE;
>  	}
>  
> @@ -5660,7 +5640,6 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  			intel_dp->is_mst = false;
>  			drm_dp_mst_topology_mgr_set_mst(&intel_dp->mst_mgr,
>  							intel_dp->is_mst);
> -			intel_dp->detect_done = false;
>  			goto put_power;
>  		}
>  	}
> @@ -5673,10 +5652,8 @@ intel_dp_hpd_pulse(struct intel_digital_port *intel_dig_port, bool long_hpd)
>  		/* Short pulse can signify loss of hdcp authentication */
>  		intel_hdcp_check_link(intel_dp->attached_connector);
>  
> -		if (!handled) {
> -			intel_dp->detect_done = false;
> +		if (!handled)
>  			goto put_power;
> -		}
>  	}
>  
>  	ret = IRQ_HANDLED;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index bf1c38728a59..c7206a4764e5 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1070,7 +1070,6 @@ struct intel_dp {
>  	bool link_mst;
>  	bool link_trained;
>  	bool has_audio;
> -	bool detect_done;
>  	bool reset_link_params;
>  	enum aux_ch aux_ch;
>  	uint8_t dpcd[DP_RECEIVER_CAP_SIZE];
> -- 
> 2.14.1

-- 
Ville Syrjälä
Intel
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