Re: [PATCH v2 3/3] drm/i915: Send hotplug event if edid had changed.

[Ramalingam C <ramalingam.c@intel.com>]

On 2019-06-28 at 11:24:54 +0300, Stanislav Lisovskiy wrote:
> Added edid checking to dp and hdmi edid setting functions, which
> are called from detect hooks. The result currently is propagated
> to calling layer using drm_connector->change_counter(proposed by Daniel Vetter).
> drm_helper_hpd_irq_event and intel_encoder_hotplug are currently both
> responsible for checking if this counter or connection status is changed.
> 
> There are conflicting parts in drm and i915 which attempt
> to do the same job - drm_helper_hpd_irq_event attempts to
> check connector status changes and then call hotplug,
> just as i915_hotplug_work_func, which calls encoder->hotplug
> hook which in turn calls generic intel_encoder_hotplug function
> which attempts to probe if output has changed.
> Looks like both needs to be changed, so added edid checking
> also to intel_encoder_hotplug function which is called both
> for hdmi and dp.
> 
> v2: Renamed change counter to epoch counter. Fixed type name.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105540
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c      | 16 +++++++++++++++-
>  drivers/gpu/drm/i915/display/intel_hdmi.c    | 16 +++++++++++++---
>  drivers/gpu/drm/i915/display/intel_hotplug.c | 20 +++++++++++++++-----
>  3 files changed, 43 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 4336df46fe78..c2ed02478cf9 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -5510,10 +5510,24 @@ static void
>  intel_dp_set_edid(struct intel_dp *intel_dp)
>  {
>  	struct intel_connector *intel_connector = intel_dp->attached_connector;
> +	struct drm_connector *connector = &intel_connector->base;
>  	struct edid *edid;
> +	struct edid *old_edid;
>  
> -	intel_dp_unset_edid(intel_dp);
>  	edid = intel_dp_get_edid(intel_dp);
> +	old_edid = intel_connector->detect_edid;
> +
> +	if (!drm_edid_are_equal(edid, old_edid)) {
> +		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Edid was changed! Updating blob property.\n",
> +		    connector->base.id, connector->name);
> +
> +		connector->epoch_counter += 1;
> +		DRM_DEBUG_KMS("Updating change counter to %llu\n", connector->epoch_counter);
> +
> +		intel_connector_update_modes(&intel_connector->base, edid);
> +	}
> +
> +	intel_dp_unset_edid(intel_dp);
>  	intel_connector->detect_edid = edid;
>  
>  	intel_dp->has_audio = drm_detect_monitor_audio(edid);
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index 0ebec69bbbfc..f892c7b795ce 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -2503,7 +2503,7 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
>  	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
>  	intel_wakeref_t wakeref;
> -	struct edid *edid;
> +	struct edid *edid, *old_edid;
>  	bool connected = false;
>  	struct i2c_adapter *i2c;
>  
> @@ -2524,11 +2524,22 @@ intel_hdmi_set_edid(struct drm_connector *connector)
>  
>  	intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS, wakeref);
>  
> +	old_edid = to_intel_connector(connector)->detect_edid;
> +
> +	if (!drm_edid_are_equal(edid, old_edid)) {
> +		intel_connector_update_modes(connector, edid);
> +		DRM_DEBUG_KMS("Updating change counter to %llu\n", connector->epoch_counter);
> +		connector->epoch_counter += 1;
> +
> +		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] Edid was changed! Updating blob property.\n",
> +		    connector->base.id, connector->name);
> +	}
> +	intel_hdmi_unset_edid(connector);
>  	to_intel_connector(connector)->detect_edid = edid;
> +
This and next changes are unrelated with this commit. Might want to keep
it for separate patch.

-Ram
>  	if (edid && edid->input & DRM_EDID_INPUT_DIGITAL) {
>  		intel_hdmi->has_audio = drm_detect_monitor_audio(edid);
>  		intel_hdmi->has_hdmi_sink = drm_detect_hdmi_monitor(edid);
> -
>  		connected = true;
>  	}
>  
> @@ -2555,7 +2566,6 @@ intel_hdmi_detect(struct drm_connector *connector, bool force)
>  	    !intel_digital_port_connected(encoder))
>  		goto out;
>  
> -	intel_hdmi_unset_edid(connector);
>  
>  	if (intel_hdmi_set_edid(connector))
>  		status = connector_status_connected;
> diff --git a/drivers/gpu/drm/i915/display/intel_hotplug.c b/drivers/gpu/drm/i915/display/intel_hotplug.c
> index ea3de4acc850..f9d9e963196a 100644
> --- a/drivers/gpu/drm/i915/display/intel_hotplug.c
> +++ b/drivers/gpu/drm/i915/display/intel_hotplug.c
> @@ -271,23 +271,33 @@ bool intel_encoder_hotplug(struct intel_encoder *encoder,
>  {
>  	struct drm_device *dev = connector->base.dev;
>  	enum drm_connector_status old_status;
> +	u64 old_epoch_counter;
> +	bool ret = false;
>  
>  	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
>  	old_status = connector->base.status;
>  
> +	old_epoch_counter = connector->base.epoch_counter;
> +
>  	connector->base.status =
>  		drm_helper_probe_detect(&connector->base, NULL, false);
>  
> -	if (old_status == connector->base.status)
> -		return false;
> +	if (old_epoch_counter != connector->base.epoch_counter)
> +		ret = true;
>  
> -	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
> +	if (old_status != connector->base.status)
> +		ret = true;
> +
> +	if (ret) {
> +		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s(change counter %llu)\n",
>  		      connector->base.base.id,
>  		      connector->base.name,
>  		      drm_get_connector_status_name(old_status),
> -		      drm_get_connector_status_name(connector->base.status));
> +		      drm_get_connector_status_name(connector->base.status),
> +		      connector->base.epoch_counter);
> +	}
>  
> -	return true;
> +	return ret;
>  }
>  
>  static bool intel_encoder_has_hpd_pulse(struct intel_encoder *encoder)
> -- 
> 2.17.1
> 
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