Re: [PATCH 2/6] drm/i915: Cleaning up intel_dp_hpd_pulse

[Ander Conselvan De Oliveira <conselvan2@gmail.com>]

On Fri, 2015-11-06 at 17:58 +0530, Shubhangi Shrivastava wrote:
> Current DP detection has DPCD operations split across
> intel_dp_hpd_pulse and intel_dp_detect which contains
> duplicates as well. Also intel_dp_detect is called
> during modes enumeration as well which will result
> in multiple dpcd operations. So this patch tries
> to solve both these by bringing all DPCD operations
> in one single function and make intel_dp_detect
> use existing values instead of repeating same steps.
> 
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
> Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 19 ++++---------------
>  1 file changed, 4 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index a0fe827..4e74cd6 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4881,7 +4881,8 @@ intel_dp_detect(struct drm_connector *connector, bool
> force)
>  		return connector_status_disconnected;
>  	}
>  
> -	intel_dp_long_pulse(intel_dp->attached_connector);
> +	if (force)
> +		intel_dp_long_pulse(intel_dp->attached_connector);
>  
>  	if (intel_connector->detect_edid)
>  		return connector_status_connected;
> @@ -5211,21 +5212,9 @@ intel_dp_hpd_pulse(struct intel_digital_port
> *intel_dig_port, bool long_hpd)
>  		/* indicate that we need to restart link training */
>  		intel_dp->train_set_valid = false;
>  
> -		if (!intel_digital_port_connected(dev_priv, intel_dig_port))
> -			goto mst_fail;
> +		intel_dp_long_pulse(intel_dp->attached_connector);
> +		goto put_power;
>  
> -		if (!intel_dp_get_dpcd(intel_dp)) {
> -			goto mst_fail;
> -		}

So we don't call this for eDP anymore on long pulse, which I assume is harmless
since the bits we are reading from DPCD shouldn't change?

> -
> -		intel_dp_probe_oui(intel_dp);
> -
> -		if (!intel_dp_probe_mst(intel_dp)) {
> -			drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
> -			intel_dp_check_link_status(intel_dp);
> -			drm_modeset_unlock(&dev->mode_config.connection_mutex);
> -			goto mst_fail;
> -		}

Hmm, so this is where that hunk from patch 1 I said should be a separate patch
comes from. Looks like in belongs to this patch.

>  	} else {
>  		if (intel_dp->is_mst) {
>  			if (intel_dp_check_mst_status(intel_dp) == -EINVAL)
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