Re: [PATCH v3 03/10] drm/i915: Attach content type property

[Daniel Vetter <daniel@ffwll.ch>]

On Fri, Mar 22, 2019 at 06:14:41AM +0530, Ramalingam C wrote:
> Attaches the content type property for HDCP2.2 capable connectors.
> 
> Implements the update of content type from property and apply the
> restriction on HDCP version selection.
> 
> v2:
>   s/cp_content_type/content_protection_type [daniel]
>   disable at hdcp_atomic_check to avoid check at atomic_set_property
> 	[Maarten]
> v3:
>   s/content_protection_type/hdcp_content_type [Pekka]
> 
> Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c  | 21 +++++++++++++++------
>  drivers/gpu/drm/i915/intel_drv.h  |  2 +-
>  drivers/gpu/drm/i915/intel_hdcp.c | 30 +++++++++++++++++++++++++-----
>  3 files changed, 41 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index 933df3a57a8a..43859f126b82 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -3495,7 +3495,8 @@ static void intel_enable_ddi(struct intel_encoder *encoder,
>  	/* Enable hdcp if it's desired */
>  	if (conn_state->content_protection ==
>  	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
> -		intel_hdcp_enable(to_intel_connector(conn_state->connector));
> +		intel_hdcp_enable(to_intel_connector(conn_state->connector),
> +				  (u8)conn_state->hdcp_content_type);
>  }
>  
>  static void intel_disable_ddi_dp(struct intel_encoder *encoder,
> @@ -3558,21 +3559,29 @@ static void intel_ddi_update_pipe_dp(struct intel_encoder *encoder,
>  	intel_panel_update_backlight(encoder, crtc_state, conn_state);
>  }
>  
> -static void intel_ddi_update_pipe(struct intel_encoder *encoder,
> +static void intel_ddi_update_hdcp(struct intel_encoder *encoder,
>  				  const struct intel_crtc_state *crtc_state,
>  				  const struct drm_connector_state *conn_state)

Not sure why you split this out, doesn't feel necessary ...

>  {
> -	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
> -		intel_ddi_update_pipe_dp(encoder, crtc_state, conn_state);
> -
>  	if (conn_state->content_protection ==
>  	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
> -		intel_hdcp_enable(to_intel_connector(conn_state->connector));
> +		intel_hdcp_enable(to_intel_connector(conn_state->connector),
> +				  (u8)conn_state->hdcp_content_type);
>  	else if (conn_state->content_protection ==
>  		 DRM_MODE_CONTENT_PROTECTION_UNDESIRED)
>  		intel_hdcp_disable(to_intel_connector(conn_state->connector));
>  }
>  
> +static void intel_ddi_update_pipe(struct intel_encoder *encoder,
> +				  const struct intel_crtc_state *crtc_state,
> +				  const struct drm_connector_state *conn_state)
> +{
> +	if (!intel_crtc_has_type(crtc_state, INTEL_OUTPUT_HDMI))
> +		intel_ddi_update_pipe_dp(encoder, crtc_state, conn_state);
> +
> +	intel_ddi_update_hdcp(encoder, crtc_state, conn_state);
> +}
> +
>  static void intel_ddi_set_fia_lane_count(struct intel_encoder *encoder,
>  					 const struct intel_crtc_state *pipe_config,
>  					 enum port port)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index a37a4477994c..e387e842f414 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -2178,7 +2178,7 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
>  			     struct drm_connector_state *new_state);
>  int intel_hdcp_init(struct intel_connector *connector,
>  		    const struct intel_hdcp_shim *hdcp_shim);
> -int intel_hdcp_enable(struct intel_connector *connector);
> +int intel_hdcp_enable(struct intel_connector *connector, u8 content_type);
>  int intel_hdcp_disable(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);
> diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
> index ff9497e5c591..9b4904a62744 100644
> --- a/drivers/gpu/drm/i915/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -1782,6 +1782,13 @@ static void intel_hdcp2_init(struct intel_connector *connector)
>  		return;
>  	}
>  
> +	ret = drm_connector_attach_hdcp_content_type_property(
> +						&connector->base);
> +	if (ret) {
> +		kfree(hdcp->port_data.streams);
> +		return;
> +	}
> +
>  	hdcp->hdcp2_supported = true;
>  }
>  
> @@ -1811,7 +1818,7 @@ int intel_hdcp_init(struct intel_connector *connector,
>  	return 0;
>  }
>  
> -int intel_hdcp_enable(struct intel_connector *connector)
> +int intel_hdcp_enable(struct intel_connector *connector, u8 content_type)
>  {
>  	struct intel_hdcp *hdcp = &connector->hdcp;
>  	unsigned long check_link_interval = DRM_HDCP_CHECK_PERIOD_MS;
> @@ -1822,6 +1829,7 @@ int intel_hdcp_enable(struct intel_connector *connector)
>  
>  	mutex_lock(&hdcp->mutex);
>  	WARN_ON(hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED);
> +	hdcp->content_type = content_type;
>  
>  	/*
>  	 * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
> @@ -1833,8 +1841,12 @@ int intel_hdcp_enable(struct intel_connector *connector)
>  			check_link_interval = DRM_HDCP2_CHECK_PERIOD_MS;
>  	}
>  
> -	/* When HDCP2.2 fails, HDCP1.4 will be attempted */
> -	if (ret && intel_hdcp_capable(connector)) {
> +	/*
> +	 * When HDCP2.2 fails and Content Type is not Type1, HDCP1.4 will
> +	 * be attempted.
> +	 */
> +	if (ret && intel_hdcp_capable(connector) &&
> +	    hdcp->content_type != DRM_MODE_HDCP_CONTENT_TYPE1) {
>  		ret = _intel_hdcp_enable(connector);
>  	}
>  
> @@ -1901,6 +1913,8 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
>  {
>  	u64 old_cp = old_state->content_protection;
>  	u64 new_cp = new_state->content_protection;
> +	u64 old_type = old_state->hdcp_content_type;
> +	u64 new_type = new_state->hdcp_content_type;
>  	struct drm_crtc_state *crtc_state;
>  
>  	if (!new_state->crtc) {
> @@ -1920,8 +1934,14 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
>  	 */
>  	if (old_cp == new_cp ||
>  	    (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
> -	     new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED))
> -		return;
> +	     new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) {
> +		if (old_type == new_type)
> +			return;
> +
> +		new_state->content_protection =
> +			DRM_MODE_CONTENT_PROTECTION_DESIRED;
> +		intel_hdcp_disable(to_intel_connector(connector));

No touching hw (or any persistent sw state outside of the free-standing
state structures) from atomic_check, ever. ATOMIC_TEST_ONLY is implemented
by running atomic_check code, and then simply releasing the computed
state. If you touch hw/sw state, then that's not undone.

We need to integrated this into the pipe_update function I think.
-Daniel

> +	}
>  
>  	crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
>  						   new_state->crtc);
> -- 
> 2.19.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel