Re: [PATCH v9 5/6] drm/i915/hdcp: update current transcoder into intel_hdcp

[Ramalingam C <ramalingam.c@intel.com>]

On 2019-08-27 at 10:49:25 +0530, Sharma, Shashank wrote:
> Regards
> 
> Shashank
> 
> On 8/22/2019 8:49 PM, Ramalingam C wrote:
> > On gen12+ platforms, HDCP HW is associated to the transcoder.
> > Hence on every modeset update associated transcoder into the
> > intel_hdcp of the port.
> > 
> > v2:
> >    s/trans/cpu_transcoder [Jani]
> > 
> > Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
> > Acked-by: Jani Nikula <jani.nikula@intel.com>
> > ---
> >   .../drm/i915/display/intel_display_types.h    |  7 +++
> >   drivers/gpu/drm/i915/display/intel_dp.c       |  3 ++
> >   drivers/gpu/drm/i915/display/intel_hdcp.c     | 49 ++++++++++++++++++-
> >   drivers/gpu/drm/i915/display/intel_hdcp.h     |  3 ++
> >   drivers/gpu/drm/i915/display/intel_hdmi.c     |  3 ++
> >   5 files changed, 64 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> > index 449abaea619f..fc85b3e284d4 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> > @@ -388,6 +388,13 @@ struct intel_hdcp {
> >   	wait_queue_head_t cp_irq_queue;
> >   	atomic_t cp_irq_count;
> >   	int cp_irq_count_cached;
> > +
> > +	/*
> > +	 * HDCP register access for gen12+ need the transcoder associated.
> > +	 * Transcoder attached to the connector could be changed at modeset.
> > +	 * Hence caching the transcoder here.
> > +	 */
> > +	enum transcoder cpu_transcoder;
> attached_transcoder to be inline with MEI counterpart of the code ?
This is needed so that we can use this to get the offset of register.
Need not be inline with MEI.
> >   };
> >   struct intel_connector {
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 921ad0a2f7ba..ba5317d56da7 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -2244,6 +2244,9 @@ 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 534832f435dc..1e5548833e8f 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > @@ -1762,13 +1762,60 @@ enum mei_fw_ddi intel_get_mei_fw_ddi_index(enum port port)
> >   	}
> >   }
> > +static inline
> > +enum mei_fw_tc intel_get_mei_fw_tc(enum transcoder cpu_transcoder)
> > +{
> > +	switch (cpu_transcoder) {
> > +	case TRANSCODER_A ... TRANSCODER_D:
> > +		return (enum mei_fw_tc)(cpu_transcoder | 0x10);
> Again, as this is in context of HDCP, we should not entertain transcoders
> below. Or we should move this function in a more generic file like
> intel_display.c or intel_ddi.c
This is specific to hdcp. So let it be here. We will fill invalid
TRANSCODER for all non HDCO capable transcoders. Hope that works for
you.

> > +	case TRANSCODER_EDP:
> > +		return MEI_TC_EDP;
> > +	case TRANSCODER_DSI_0:
> > +		return MEI_TC_DSI0;
> > +	case TRANSCODER_DSI_1:
> > +		return MEI_TC_DSI1;
> > +	default:
> > +		return MEI_INVALID_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) {
> Ah, so this is the gen_check which I was talking about in previous patch :-)
> > +		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)
> >   {
> > +	struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> >   	struct intel_hdcp *hdcp = &connector->hdcp;
> >   	struct hdcp_port_data *data = &hdcp->port_data;
> > +	struct intel_crtc *crtc;
> > +
> > +	if (INTEL_GEN(dev_priv) < 12) {
> > +		data->fw_ddi =
> > +			intel_get_mei_fw_ddi_index(connector->encoder->port);
> > +	} else {
> > +		crtc = to_intel_crtc(connector->base.state->crtc);
> > +		if (crtc) {
> > +			hdcp->cpu_transcoder = crtc->config->cpu_transcoder;
> > +			data->fw_tc = intel_get_mei_fw_tc(hdcp->cpu_transcoder);
> > +		}
> > +		data->fw_ddi = intel_get_mei_fw_ddi_index(PORT_NONE);
> 
> I dint understand this, why PORT_NONE ?
ME FW API expects invalid PORT for GEN12+. Hence we assign the required
value here. May be I will add that info as doc here.

-Ram
> 
> - Shashank
> 
> > +	}
> > -	data->fw_ddi = intel_get_mei_fw_ddi_index(connector->encoder->port);
> >   	data->port_type = (u8)HDCP_PORT_TYPE_INTEGRATED;
> >   	data->protocol = (u8)shim->protocol;
> > diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.h b/drivers/gpu/drm/i915/display/intel_hdcp.h
> > index 59a2b40405cc..41c1053d9e38 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.h
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
> > @@ -16,10 +16,13 @@ struct drm_i915_private;
> >   struct intel_connector;
> >   struct intel_hdcp_shim;
> >   enum port;
> > +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);
> > diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> > index e02f0faecf02..6e9bb6bd1ee2 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> > @@ -2431,6 +2431,9 @@ 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;
> >   }
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