[Intel-gfx] [PATCH 1/2] drm/i915/hdcp: Create a blanket hdcp enable function

[Kandpal, Suraj]

> -----Original Message-----
> From: Jani Nikula <jani.nikula at linux.intel.com>
> Sent: Thursday, October 26, 2023 1:02 PM
> To: Kandpal, Suraj <suraj.kandpal at intel.com>; intel-gfx at lists.freedesktop.org
> Cc: Shankar, Uma <uma.shankar at intel.com>; Nautiyal, Ankit K
> <ankit.k.nautiyal at intel.com>; Kandpal, Suraj <suraj.kandpal at intel.com>
> Subject: Re: [PATCH 1/2] drm/i915/hdcp: Create a blanket hdcp enable function
> 
> On Thu, 26 Oct 2023, Suraj Kandpal <suraj.kandpal at intel.com> wrote:
> > Let's create a blanket function which just has some conditions which
> > need to be checked before connectors enable hdcp.
> > This cleans up code and avoids code duplication.
> 
> Let's call that function intel_hdcp_enable(), and hide all the details inside
> intel_hdcp.c. These are the only callers outside of intel_hdcp.c.

Maybe the rename current intel_hdcp_enable() to something else as that also is called in
Intel_hdcp_update_pipe on which I wouldn't want these conditions to be enforced.
I thought of renaming the current intel_hdcp_enable() to _intel_hdcp_enable() but that is already
Being used as a function name to enable hdcp1.4
So any suggestions what I can rename it to?

Regards,
Suraj Kandpal
> 
> BR,
> Jani.
> 
> >
> > Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_ddi.c    |  5 +----
> >  drivers/gpu/drm/i915/display/intel_dp_mst.c |  5 +----
> >  drivers/gpu/drm/i915/display/intel_hdcp.c   | 11 +++++++++++
> >  drivers/gpu/drm/i915/display/intel_hdcp.h   |  4 ++++
> >  4 files changed, 17 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> > b/drivers/gpu/drm/i915/display/intel_ddi.c
> > index 9151d5add960..338049b66e9c 100644
> > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > @@ -3259,10 +3259,7 @@ static void intel_enable_ddi(struct
> intel_atomic_state *state,
> >  	else
> >  		intel_enable_ddi_dp(state, encoder, crtc_state, conn_state);
> >
> > -	/* Enable hdcp if it's desired */
> > -	if (conn_state->content_protection ==
> > -	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
> > -		intel_hdcp_enable(state, encoder, crtc_state, conn_state);
> > +	intel_hdcp_try_enable(state, encoder, crtc_state, conn_state);
> >  }
> >
> >  static void intel_disable_ddi_dp(struct intel_atomic_state *state,
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > index 7b4628f4f124..cfcaf54a4a72 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > @@ -836,10 +836,7 @@ static void intel_mst_enable_dp(struct
> > intel_atomic_state *state,
> >
> >  	intel_audio_codec_enable(encoder, pipe_config, conn_state);
> >
> > -	/* Enable hdcp if it's desired */
> > -	if (conn_state->content_protection ==
> > -	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
> > -		intel_hdcp_enable(state, encoder, pipe_config, conn_state);
> > +	intel_hdcp_try_enable(state, encoder, pipe_config, conn_state);
> >  }
> >
> >  static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder
> > *encoder, diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > index c89da3568ebd..9d632a85309d 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > @@ -2324,6 +2324,17 @@ intel_hdcp_set_streams(struct intel_digital_port
> *dig_port,
> >  	return 0;
> >  }
> >
> > +void intel_hdcp_try_enable(struct intel_atomic_state *state,
> > +			   struct intel_encoder *encoder,
> > +			   const struct intel_crtc_state *crtc_state,
> > +			   const struct drm_connector_state *conn_state) {
> > +	/* Enable hdcp if it's desired */
> > +	if (conn_state->content_protection ==
> > +	    DRM_MODE_CONTENT_PROTECTION_DESIRED)
> > +		intel_hdcp_enable(state, encoder, crtc_state, conn_state); }
> > +
> >  int intel_hdcp_enable(struct intel_atomic_state *state,
> >  		      struct intel_encoder *encoder,
> >  		      const struct intel_crtc_state *pipe_config, diff --git
> > a/drivers/gpu/drm/i915/display/intel_hdcp.h
> > b/drivers/gpu/drm/i915/display/intel_hdcp.h
> > index 5997c52a0958..280eaa4d1010 100644
> > --- a/drivers/gpu/drm/i915/display/intel_hdcp.h
> > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
> > @@ -44,5 +44,9 @@ void intel_hdcp_component_init(struct
> > drm_i915_private *i915);  void intel_hdcp_component_fini(struct
> > drm_i915_private *i915);  void intel_hdcp_cleanup(struct
> > intel_connector *connector);  void intel_hdcp_handle_cp_irq(struct
> > intel_connector *connector);
> > +void intel_hdcp_try_enable(struct intel_atomic_state *state,
> > +			   struct intel_encoder *encoder,
> > +			   const struct intel_crtc_state *crtc_state,
> > +			   const struct drm_connector_state *conn_state);
> >
> >  #endif /* __INTEL_HDCP_H__ */
> 
> --
> Jani Nikula, Intel