[Intel-gfx] [PATCH 1/9] drm/i915/hdcp: Nuke intel_hdcp_transcoder_config()

[Ramalingam C]

On 2019-12-04 at 20:05:41 +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> intel_hdcp_transcoder_config() is clobbering some globally visible
> state in .compute_config(). That is a big no no as .compute_config()
> is supposed to have no visible side effects when either the commit
> fails or it's just a TEST_ONLY commit.
> 
> Inline this stuff into intel_hdcp_enable() so that the state only
> gets modified when we actually commit the state to the hardware.
> 
> Cc: Ramalingam C <ramalingam.c at intel.com>
> Cc: Jani Nikula <jani.nikula at intel.com>
> Cc: Uma Shankar <uma.shankar at intel.com>
> Fixes: 39e2df090c3c ("drm/i915/hdcp: update current transcoder into intel_hdcp")
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Ramalingam C <ramalingam.c at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c  |  5 ++++-
>  drivers/gpu/drm/i915/display/intel_dp.c   |  3 ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 26 +++++++----------------
>  drivers/gpu/drm/i915/display/intel_hdcp.h |  5 ++---
>  drivers/gpu/drm/i915/display/intel_hdmi.c |  3 ---
>  5 files changed, 14 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index ebcc7302706b..e692c0b28559 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -4026,6 +4026,7 @@ static void intel_enable_ddi(struct intel_encoder *encoder,
>  	if (conn_state->content_protection ==
>  	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
>  		intel_hdcp_enable(to_intel_connector(conn_state->connector),
> +				  crtc_state->cpu_transcoder,
>  				  (u8)conn_state->hdcp_content_type);
>  }
>  
> @@ -4129,7 +4130,9 @@ static void intel_ddi_update_pipe(struct intel_encoder *encoder,
>  	if (conn_state->content_protection ==
>  	    DRM_MODE_CONTENT_PROTECTION_DESIRED ||
>  	    content_protection_type_changed)
> -		intel_hdcp_enable(connector, (u8)conn_state->hdcp_content_type);
> +		intel_hdcp_enable(connector,
> +				  crtc_state->cpu_transcoder,
> +				  (u8)conn_state->hdcp_content_type);
>  }
>  
>  static void
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 5c406a0fd045..0f496115c345 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -2425,9 +2425,6 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  
>  	intel_psr_compute_config(intel_dp, pipe_config);
>  
> -	intel_hdcp_transcoder_config(intel_connector,
> -				     pipe_config->cpu_transcoder);
> -
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 001ce27d7029..0fdbd39f6641 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -1821,23 +1821,6 @@ enum mei_fw_tc intel_get_mei_fw_tc(enum transcoder cpu_transcoder)
>  	}
>  }
>  
> -void intel_hdcp_transcoder_config(struct intel_connector *connector,
> -				  enum transcoder cpu_transcoder)
> -{
> -	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> -	struct intel_hdcp *hdcp = &connector->hdcp;
> -
> -	if (!hdcp->shim)
> -		return;
> -
> -	if (INTEL_GEN(dev_priv) >= 12) {
> -		mutex_lock(&hdcp->mutex);
> -		hdcp->cpu_transcoder = cpu_transcoder;
> -		hdcp->port_data.fw_tc = intel_get_mei_fw_tc(cpu_transcoder);
> -		mutex_unlock(&hdcp->mutex);
> -	}
> -}
> -
>  static inline int initialize_hdcp_port_data(struct intel_connector *connector,
>  					    const struct intel_hdcp_shim *shim)
>  {
> @@ -1959,8 +1942,10 @@ int intel_hdcp_init(struct intel_connector *connector,
>  	return 0;
>  }
>  
> -int intel_hdcp_enable(struct intel_connector *connector, u8 content_type)
> +int intel_hdcp_enable(struct intel_connector *connector,
> +		      enum transcoder cpu_transcoder, u8 content_type)
>  {
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>  	struct intel_hdcp *hdcp = &connector->hdcp;
>  	unsigned long check_link_interval = DRM_HDCP_CHECK_PERIOD_MS;
>  	int ret = -EINVAL;
> @@ -1972,6 +1957,11 @@ int intel_hdcp_enable(struct intel_connector *connector, u8 content_type)
>  	WARN_ON(hdcp->value == DRM_MODE_CONTENT_PROTECTION_ENABLED);
>  	hdcp->content_type = content_type;
>  
> +	if (INTEL_GEN(dev_priv) >= 12) {
> +		hdcp->cpu_transcoder = cpu_transcoder;
> +		hdcp->port_data.fw_tc = intel_get_mei_fw_tc(cpu_transcoder);
> +	}
> +
>  	/*
>  	 * Considering that HDCP2.2 is more secure than HDCP1.4, If the setup
>  	 * is capable of HDCP2.2, it is preferred to use HDCP2.2.
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.h b/drivers/gpu/drm/i915/display/intel_hdcp.h
> index 41c1053d9e38..f3c3272e712a 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.h
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
> @@ -21,11 +21,10 @@ enum transcoder;
>  void intel_hdcp_atomic_check(struct drm_connector *connector,
>  			     struct drm_connector_state *old_state,
>  			     struct drm_connector_state *new_state);
> -void intel_hdcp_transcoder_config(struct intel_connector *connector,
> -				  enum transcoder cpu_transcoder);
>  int intel_hdcp_init(struct intel_connector *connector,
>  		    const struct intel_hdcp_shim *hdcp_shim);
> -int intel_hdcp_enable(struct intel_connector *connector, u8 content_type);
> +int intel_hdcp_enable(struct intel_connector *connector,
> +		      enum transcoder cpu_transcoder, 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/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index 29a174af5314..a89a09b25260 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -2490,9 +2490,6 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
>  		return -EINVAL;
>  	}
>  
> -	intel_hdcp_transcoder_config(intel_hdmi->attached_connector,
> -				     pipe_config->cpu_transcoder);
> -
>  	return 0;
>  }
>  
> -- 
> 2.23.0
>