Re: [PATCH v9 06/39] drm/i915: Initialize HDCP2.2

[Daniel Vetter <daniel@ffwll.ch>]

On Thu, Dec 13, 2018 at 09:31:08AM +0530, Ramalingam C wrote:
> Add the HDCP2.2 initialization to the existing HDCP1.4 stack.
> 
> v2:
>   mei interface handle is protected with mutex. [Chris Wilson]
> v3:
>   Notifiers are used for the mei interface state.
> v4:
>   Poll for mei client device state
>   Error msg for out of mem [Uma]
>   Inline req for init function removed [Uma]
> v5:
>   Rebase as Part of reordering.
>   Component is used for the I915 and MEI_HDCP interface [Daniel]
> v6:
>   HDCP2.2 uses the I915 component master to communicate with mei_hdcp
> 	- [Daniel]
>   Required HDCP2.2 variables defined [Sean Paul]
> v7:
>   intel_hdcp2.2_init returns void [Uma]
>   Realigning the codes.
> v8:
>   Avoid using bool structure members.
>   MEI interface related changes are moved into separate patch.
>   Commit msg is updated accordingly.
>   intel_hdcp_exit is defined and used from i915_unload
> v9:
>   Movement of the hdcp_check_link is moved to new patch [Daniel]
>   intel_hdcp2_exit is removed as mei_comp will be unbind in i915_unload.

All concerns I had addressed.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> 
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c   |  3 ++-
>  drivers/gpu/drm/i915/intel_drv.h  | 15 ++++++++++++++-
>  drivers/gpu/drm/i915/intel_hdcp.c | 30 +++++++++++++++++++++++++++---
>  drivers/gpu/drm/i915/intel_hdmi.c |  2 +-
>  4 files changed, 44 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index e94faa0a42eb..aba884c64879 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -6902,7 +6902,8 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
>  	intel_dp_add_properties(intel_dp, connector);
>  
>  	if (is_hdcp_supported(dev_priv, port) && !intel_dp_is_edp(intel_dp)) {
> -		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim);
> +		int ret = intel_hdcp_init(intel_connector, &intel_dp_hdcp_shim,
> +					  false);
>  		if (ret)
>  			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
>  	}
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index d08f08f607dd..dd9371647a8c 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -388,6 +388,17 @@ struct intel_hdcp {
>  	u64 value;
>  	struct delayed_work check_work;
>  	struct work_struct prop_work;
> +
> +	/* HDCP2.2 related definitions */
> +	/* Flag indicates whether this connector supports HDCP2.2 or not. */
> +	u8 hdcp2_supported;
> +
> +	/*
> +	 * Content Stream Type defined by content owner. TYPE0(0x0) content can
> +	 * flow in the link protected by HDCP2.2 or HDCP1.4, where as TYPE1(0x1)
> +	 * content can flow only through a link protected by HDCP2.2.
> +	 */
> +	u8 content_type;
>  };
>  
>  struct intel_connector {
> @@ -2038,12 +2049,14 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
>  			     struct drm_connector_state *old_state,
>  			     struct drm_connector_state *new_state);
>  int intel_hdcp_init(struct intel_connector *connector,
> -		    const struct intel_hdcp_shim *hdcp_shim);
> +		    const struct intel_hdcp_shim *hdcp_shim,
> +		    bool hdcp2_supported);
>  int intel_hdcp_enable(struct intel_connector *connector);
>  int intel_hdcp_disable(struct intel_connector *connector);
>  int intel_hdcp_check_link(struct intel_connector *connector);
>  bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port);
>  bool intel_hdcp_capable(struct intel_connector *connector);
> +bool is_hdcp2_supported(struct drm_i915_private *dev_priv);
>  
>  /* intel_psr.c */
>  #define CAN_PSR(dev_priv) (HAS_PSR(dev_priv) && dev_priv->psr.sink_support)
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> index 506b4cc6f46b..584d27f3c699 100644
> --- a/drivers/gpu/drm/i915/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -833,14 +833,34 @@ bool is_hdcp_supported(struct drm_i915_private *dev_priv, enum port port)
>  	return INTEL_GEN(dev_priv) >= 9 && port < PORT_E;
>  }
>  
> +bool is_hdcp2_supported(struct drm_i915_private *dev_priv)
> +{
> +	return ((INTEL_GEN(dev_priv) >= 10 || IS_GEMINILAKE(dev_priv) ||
> +		 IS_KABYLAKE(dev_priv)) && IS_ENABLED(CONFIG_INTEL_MEI_HDCP));
> +}
> +
> +static void intel_hdcp2_init(struct intel_connector *connector)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +	struct intel_hdcp *hdcp = &connector->hdcp;
> +
> +	WARN_ON(!is_hdcp2_supported(dev_priv));
> +
> +	/* TODO: MEI interface needs to be initialized here */
> +	hdcp->hdcp2_supported = 1;
> +}
> +
>  int intel_hdcp_init(struct intel_connector *connector,
> -		    const struct intel_hdcp_shim *shim)
> +		    const struct intel_hdcp_shim *shim,
> +		    bool hdcp2_supported)
>  {
>  	struct intel_hdcp *hdcp = &connector->hdcp;
>  	int ret;
>  
> -	ret = drm_connector_attach_content_protection_property(
> -			&connector->base);
> +	if (!shim)
> +		return -EINVAL;
> +
> +	ret = drm_connector_attach_content_protection_property(&connector->base);
>  	if (ret)
>  		return ret;
>  
> @@ -848,6 +868,10 @@ int intel_hdcp_init(struct intel_connector *connector,
>  	mutex_init(&hdcp->mutex);
>  	INIT_DELAYED_WORK(&hdcp->check_work, intel_hdcp_check_work);
>  	INIT_WORK(&hdcp->prop_work, intel_hdcp_prop_work);
> +
> +	if (hdcp2_supported)
> +		intel_hdcp2_init(connector);
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index 07e803a604bd..38fe0fdbf8d8 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -2434,7 +2434,7 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>  
>  	if (is_hdcp_supported(dev_priv, port)) {
>  		int ret = intel_hdcp_init(intel_connector,
> -					  &intel_hdmi_hdcp_shim);
> +					  &intel_hdmi_hdcp_shim, false);
>  		if (ret)
>  			DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
>  	}
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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