Re: [PATCH 3/4] drm/i915: Check live status before reading edid

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

On Tue, 25 Aug 2015, Sonika Jindal <sonika.jindal@intel.com> wrote:
> Adding this for SKL onwards.
>
> v2: Adding checks for VLV/CHV as well. Reusing old ibx and g4x functions
> to check digital port status. Adding a separate function to get bxt live
> status (Daniel)
> v3: Using intel_encoder->hpd_pin to check the live status (Siva)
> Moving the live status read to intel_hdmi_probe and passing parameter
> to read/not to read the edid. (me)

We may want to merge this cleanup first:
http://mid.gmane.org/cover.1440056461.git.jani.nikula@intel.com

BR,
Jani.



>
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c   |    4 +--
>  drivers/gpu/drm/i915/intel_drv.h  |    2 ++
>  drivers/gpu/drm/i915/intel_hdmi.c |   62 ++++++++++++++++++++++++++++++++-----
>  3 files changed, 58 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index b905c19..8f2eba2 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4477,8 +4477,8 @@ ironlake_dp_detect(struct intel_dp *intel_dp)
>  	return intel_dp_detect_dpcd(intel_dp);
>  }
>  
> -static int g4x_digital_port_connected(struct drm_device *dev,
> -				       struct intel_digital_port *intel_dig_port)
> +int g4x_digital_port_connected(struct drm_device *dev,
> +			       struct intel_digital_port *intel_dig_port)
>  {
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	uint32_t bit;
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 232b814..b07e141 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1192,6 +1192,8 @@ void intel_edp_drrs_disable(struct intel_dp *intel_dp);
>  void intel_edp_drrs_invalidate(struct drm_device *dev,
>  		unsigned frontbuffer_bits);
>  void intel_edp_drrs_flush(struct drm_device *dev, unsigned frontbuffer_bits);
> +int g4x_digital_port_connected(struct drm_device *dev,
> +			       struct intel_digital_port *intel_dig_port);
>  
>  /* intel_dp_mst.c */
>  int intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_id);
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 68886c0..59518b4 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -1328,23 +1328,63 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
>  	to_intel_connector(connector)->detect_edid = NULL;
>  }
>  
> +static bool bxt_port_connected(struct drm_i915_private *dev_priv,
> +			       struct intel_digital_port *intel_dig_port)
> +{
> +	struct intel_encoder *intel_encoder = &intel_dig_port->base;
> +	enum port port;
> +	u32 temp = I915_READ(GEN8_DE_PORT_ISR);
> +
> +	intel_hpd_pin_to_port(intel_encoder->hpd_pin, &port);
> +	switch (port) {
> +	case PORT_A:
> +		return temp & BXT_DE_PORT_HP_DDIA;
> +
> +	case PORT_B:
> +		return temp & BXT_DE_PORT_HP_DDIB;
> +
> +	case PORT_C:
> +		return temp & BXT_DE_PORT_HP_DDIC;
> +
> +	default:
> +		return false;
> +
> +	}
> +}
> +
> +static bool intel_hdmi_live_status(struct intel_digital_port *intel_dig_port)
> +{
> +	struct drm_device *dev = intel_dig_port->base.base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +
> +	if (IS_VALLEYVIEW(dev))
> +		return g4x_digital_port_connected(dev, intel_dig_port);
> +	else if (IS_SKYLAKE(dev) || IS_BROADWELL(dev))
> +		return ibx_digital_port_connected(dev_priv, intel_dig_port);
> +	else if (IS_BROXTON(dev))
> +		return bxt_port_connected(dev_priv, intel_dig_port);
> +
> +	return true;
> +}
> +
>  static bool
> -intel_hdmi_set_edid(struct drm_connector *connector)
> +intel_hdmi_set_edid(struct drm_connector *connector, bool force)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
>  	struct intel_hdmi *intel_hdmi = intel_attached_hdmi(connector);
>  	struct intel_encoder *intel_encoder =
>  		&hdmi_to_dig_port(intel_hdmi)->base;
>  	enum intel_display_power_domain power_domain;
> -	struct edid *edid;
> +	struct edid *edid = NULL;
>  	bool connected = false;
>  
>  	power_domain = intel_display_port_power_domain(intel_encoder);
>  	intel_display_power_get(dev_priv, power_domain);
>  
> -	edid = drm_get_edid(connector,
> -			    intel_gmbus_get_adapter(dev_priv,
> -						    intel_hdmi->ddc_bus));
> +	if (force)
> +		edid = drm_get_edid(connector,
> +				intel_gmbus_get_adapter(dev_priv,
> +					intel_hdmi->ddc_bus));
>  
>  	intel_display_power_put(dev_priv, power_domain);
>  
> @@ -1374,6 +1414,8 @@ void intel_hdmi_probe(struct intel_encoder *intel_encoder)
>  			enc_to_intel_hdmi(&intel_encoder->base);
>  	struct intel_connector *intel_connector =
>  				intel_hdmi->attached_connector;
> +	bool live_status = false;
> +
>  	/*
>  	 * Sometimes DDI ports are enumerated as DP as well as HDMI and
>  	 * detection is left for runtime. Since DP's detection method already
> @@ -1381,13 +1423,15 @@ void intel_hdmi_probe(struct intel_encoder *intel_encoder)
>  	 */
>  	if (intel_connector->base.connector_type != DRM_MODE_CONNECTOR_HDMIA)
>  		return;
> +
> +	live_status = intel_hdmi_live_status(hdmi_to_dig_port(intel_hdmi));
>  	/*
>  	 * We are here, means there is a hotplug or a force
>  	 * detection. Clear the cached EDID and probe the
>  	 * DDC bus to check the current status of HDMI.
>  	 */
>  	intel_hdmi_unset_edid(&intel_connector->base);
> -	if (intel_hdmi_set_edid(&intel_connector->base))
> +	if (intel_hdmi_set_edid(&intel_connector->base, live_status))
>  		DRM_DEBUG_DRIVER("DDC probe: got EDID\n");
>  	else
>  		DRM_DEBUG_DRIVER("DDC probe: no EDID\n");
> @@ -1442,7 +1486,7 @@ intel_hdmi_force(struct drm_connector *connector)
>  	if (connector->status != connector_status_connected)
>  		return;
>  
> -	intel_hdmi_set_edid(connector);
> +	intel_hdmi_set_edid(connector, true);
>  	hdmi_to_dig_port(intel_hdmi)->base.type = INTEL_OUTPUT_HDMI;
>  }
>  
> @@ -1996,6 +2040,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>  	struct drm_device *dev = intel_encoder->base.dev;
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	enum port port = intel_dig_port->port;
> +	bool live_status = false;
>  
>  	drm_connector_init(dev, connector, &intel_hdmi_connector_funcs,
>  			   DRM_MODE_CONNECTOR_HDMIA);
> @@ -2079,7 +2124,8 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>  	intel_hdmi->attached_connector = intel_connector;
>  
>  	/* Set edid during init */
> -	intel_hdmi_set_edid(connector);
> +	live_status = intel_hdmi_live_status(intel_dig_port);
> +	intel_hdmi_set_edid(connector, live_status);
>  
>  	/* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
>  	 * 0xd.  Failure to do so will result in spurious interrupts being
> -- 
> 1.7.10.4
>
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-- 
Jani Nikula, Intel Open Source Technology Center
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