[PATCH v5 20/40] drm/i915: Check HDCP 1.4 and 2.2 link on CP_IRQ

[Sean Paul]

On Wed, Jun 27, 2018 at 02:10:09PM +0530, Ramalingam C wrote:
> On DP HDCP1.4 and 2.2, when CP_IRQ is received, start the link
> integrity check for the HDCP version that is enabled.
> 
> v2:
>   Rebased. Function name is changed.
> v3:
>   No Changes.
> v4:
>   No Changes.
> v5:
>   No Changes.
> 
> Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
> cc: Sean Paul <seanpaul at chromium.org>
> ---
>  drivers/gpu/drm/i915/intel_dp.c   |  2 +-
>  drivers/gpu/drm/i915/intel_drv.h  |  2 +-
>  drivers/gpu/drm/i915/intel_hdcp.c | 31 ++++++++++++++++++++++++++++++-
>  3 files changed, 32 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 7467e7b3f2df..a6ba27ef20ae 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -4484,7 +4484,7 @@ intel_dp_short_pulse(struct intel_dp *intel_dp)
>  		if (sink_irq_vector & DP_AUTOMATED_TEST_REQUEST)
>  			intel_dp_handle_test_request(intel_dp);
>  		if (sink_irq_vector & DP_CP_IRQ)
> -			intel_hdcp_check_link(intel_dp->attached_connector);
> +			intel_hdcp_handle_cp_irq(intel_dp->attached_connector);
>  		if (sink_irq_vector & DP_SINK_SPECIFIC_IRQ)
>  			DRM_DEBUG_DRIVER("Sink specific irq unhandled\n");
>  	}
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 7624388eecd5..875657fd7d3c 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -1965,8 +1965,8 @@ int intel_hdcp_init(struct intel_connector *connector,
>  		    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);
> +void intel_hdcp_handle_cp_irq(struct intel_connector *connector);
>  
>  /* 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 790f4a9f4793..b035274785c8 100644
> --- a/drivers/gpu/drm/i915/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/intel_hdcp.c
> @@ -32,6 +32,7 @@ int intel_hdcp_read_valid_bksv(struct intel_digital_port *intel_dig_port,
>  			       const struct intel_hdcp_shim *shim, u8 *bksv);
>  static
>  struct intel_digital_port *conn_to_dig_port(struct intel_connector *connector);
> +static int intel_hdcp_check_link(struct intel_connector *connector);
>  
>  static bool panel_supports_hdcp(struct intel_connector *connector)
>  {
> @@ -80,6 +81,26 @@ static inline bool intel_hdcp2_capable(struct intel_connector *connector)
>  		panel_supports_hdcp2(connector));
>  }
>  
> +static inline bool intel_hdcp_in_force(struct intel_connector *connector)

nit: I'd use _in_use instead of in_force

With that fixed,

Reviewed-by: Sean Paul <seanpaul at chromium.org>


> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +	enum port port = connector->encoder->port;
> +	u32 reg;
> +
> +	reg = I915_READ(PORT_HDCP_STATUS(port));
> +	return reg & (HDCP_STATUS_AUTH | HDCP_STATUS_ENC);
> +}
> +
> +static inline bool intel_hdcp2_in_force(struct intel_connector *connector)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> +	enum port port = connector->encoder->port;
> +	u32 reg;
> +
> +	reg = I915_READ(HDCP2_STATUS_DDI(port));
> +	return reg & (LINK_ENCRYPTION_STATUS | LINK_AUTH_STATUS);
> +}
> +
>  static int intel_hdcp_poll_ksv_fifo(struct intel_digital_port *intel_dig_port,
>  				    const struct intel_hdcp_shim *shim)
>  {
> @@ -939,7 +960,7 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
>  }
>  
>  /* Implements Part 3 of the HDCP authorization procedure */
> -int intel_hdcp_check_link(struct intel_connector *connector)
> +static int intel_hdcp_check_link(struct intel_connector *connector)
>  {
>  	struct intel_hdcp *hdcp = &connector->hdcp;
>  	struct drm_i915_private *dev_priv = connector->base.dev->dev_private;
> @@ -2011,3 +2032,11 @@ static void intel_hdcp2_check_work(struct work_struct *work)
>  		schedule_delayed_work(&hdcp->hdcp2_check_work,
>  				      DRM_HDCP2_CHECK_PERIOD_MS);
>  }
> +
> +void intel_hdcp_handle_cp_irq(struct intel_connector *connector)
> +{
> +	if (intel_hdcp_in_force(connector))
> +		intel_hdcp_check_link(connector);
> +	else if (intel_hdcp2_in_force(connector))
> +		intel_hdcp2_check_link(connector);
> +}
> -- 
> 2.7.4
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS