Re: [PATCH v10 5/6] drm/i915/hdcp: update current transcoder into intel_hdcp

Ramalingam C
2019-08-27T14:52:16Z

On 2019-08-27 at 20:03:21 +0530, Winkler, Tomas 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]
> > v3:
> > comment is added for fw_ddi init for gen12+ [Shashank]
> > only hdcp capable transcoder is translated into fw_tc [Shashank]
> >
> > 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 | 47 ++++++++++++++++++-
> > drivers/gpu/drm/i915/display/intel_hdcp.h | 3 ++
> > drivers/gpu/drm/i915/display/intel_hdmi.c | 3 ++
> > 5 files changed, 62 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 96514dcc7812..61277a87dbe7 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;
> > };
> >
> > struct intel_connector {
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> > b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 23908da1cd5d..e8471689f785 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -2248,6 +2248,9 @@ 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..3591b8f7fe30 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > @@ -1762,13 +1762,58 @@ 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);
> > + default: /* eDP, DSI TRANSCODERS are non HDCP capable */
> > + 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) {
> > + 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);
> > + }
> What is the 'else' action here, looks like there is no default value for fw_tc?
else block stands of gen12+ platforms. And with respect to fw_tc
initialization, we are configuring it at every modeset through
intel_hdcp_transcoder_config(), as transcoder might change at modeset.
And in hdcp_init initializing is possible only if crtc is associated
with connector already.

And it will be initilaized when mei_hdcp apis are called, as modeset
is essential to invoke HDCP.

PORT is statically associated with connector, hence we are initializing
here forever.

-Ram
>
> > + /*
> > + * As per ME FW API expectation, for GEN 12+, fw_ddi is filled
> > + * with INVALID PORT.
> > + */
> > + data->fw_ddi = intel_get_mei_fw_ddi_index(PORT_NONE);
> > + }
> >
> > - 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;
> > }
> >
> > --
> > 2.20.1