[Intel-gfx] [PATCH v7 17/17] drm/i915: Add HDCP 1.4 support for MST connectors
Sean Paul
sean at poorly.run
Tue Aug 11 17:28:46 UTC 2020
On Thu, Jul 9, 2020 at 8:40 AM Anshuman Gupta <anshuman.gupta at intel.com> wrote:
>
\snip
> > > +static int
> > > +intel_dp_mst_hdcp_toggle_signalling(struct intel_digital_port *intel_dig_port,
> > > + enum transcoder cpu_transcoder,
> > > + bool enable)
> > > +{
> > > + struct drm_i915_private *i915 = to_i915(intel_dig_port->base.base.dev);
> > > + int ret;
> > > +
> > > + if (!enable)
> > > + usleep_range(6, 60); /* Bspec says >= 6us */
> > > +
> > > + ret = intel_ddi_toggle_hdcp_signalling(&intel_dig_port->base,
> > > + cpu_transcoder, enable);
> > Sean,
> >
> > This function toggles the TRANS_DDI_HDCP_SIGNALLING (9th)bit of TRANS_DDI_FUNC_CTL(tran)
> > But in the hw specification this bit is mentioned to be ignored for non
> > HDMI/DVI modes of the TRANS DDI.
> >
> > Any reason why we need this? Did you try with out this function?
> >
Under "Authentication Part 1 for Multi-stream DisplayPort", bspec says:
2. Select HDCP for the desired stream using the Pipe DDI Function
Control register.
> > Apart from that Patch looks good to me.
> IMHO it seems we are still missing to enable the Multistream HDCP Select
> bit (5) in TRANS_DDI_FUNC_CTL register which is required to enable the
> stream encryption.
>
Could you send me some docs on this? I don't see have info on this bit.
Sean
> Thanks,
> Anshuman Gupta.
> >
> > -Ram
> >
> > > + if (ret)
> > > + drm_dbg_kms(&i915->drm, "%s HDCP signalling failed (%d)\n",
> > > + enable ? "Enable" : "Disable", ret);
> > > + return ret;
> > > +}
> > > +
> > > +static
> > > +bool intel_dp_mst_hdcp_check_link(struct intel_digital_port *intel_dig_port,
> > > + struct intel_connector *connector)
> > > +{
> > > + struct drm_i915_private *i915 = to_i915(intel_dig_port->base.base.dev);
> > > + struct intel_dp *intel_dp = &intel_dig_port->dp;
> > > + struct drm_dp_query_stream_enc_status_ack_reply reply;
> > > + int ret;
> > > +
> > > + if (!intel_dp_hdcp_check_link(intel_dig_port, connector))
> > > + return false;
> > > +
> > > + ret = drm_dp_send_query_stream_enc_status(&intel_dp->mst_mgr,
> > > + connector->port, &reply);
> > > + if (ret) {
> > > + drm_dbg_kms(&i915->drm,
> > > + "[CONNECTOR:%d:%s] failed QSES ret=%d\n",
> > > + connector->base.base.id, connector->base.name, ret);
> > > + return false;
> > > + }
> > > +
> > > + return reply.auth_completed && reply.encryption_enabled;
> > > +}
> > > +
> > > +static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
> > > + .write_an_aksv = intel_dp_hdcp_write_an_aksv,
> > > + .read_bksv = intel_dp_hdcp_read_bksv,
> > > + .read_bstatus = intel_dp_hdcp_read_bstatus,
> > > + .repeater_present = intel_dp_hdcp_repeater_present,
> > > + .read_ri_prime = intel_dp_hdcp_read_ri_prime,
> > > + .read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
> > > + .read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
> > > + .read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
> > > + .toggle_signalling = intel_dp_mst_hdcp_toggle_signalling,
> > > + .check_link = intel_dp_mst_hdcp_check_link,
> > > + .hdcp_capable = intel_dp_hdcp_capable,
> > > +
> > > + .protocol = HDCP_PROTOCOL_DP,
> > > +};
> > > +
> > > int intel_dp_init_hdcp(struct intel_digital_port *intel_dig_port,
> > > struct intel_connector *intel_connector)
> > > {
> > > @@ -630,7 +691,10 @@ int intel_dp_init_hdcp(struct intel_digital_port *intel_dig_port,
> > > if (!is_hdcp_supported(dev_priv, port))
> > > return 0;
> > >
> > > - if (!intel_dp_is_edp(intel_dp))
> > > + if (intel_connector->mst_port)
> > > + return intel_hdcp_init(intel_connector, port,
> > > + &intel_dp_mst_hdcp_shim);
> > > + else if (!intel_dp_is_edp(intel_dp))
> > > return intel_hdcp_init(intel_connector, port,
> > > &intel_dp_hdcp_shim);
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > index 0675825dcc20..abaaeeb963d2 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > @@ -37,6 +37,7 @@
> > > #include "intel_dp.h"
> > > #include "intel_dp_mst.h"
> > > #include "intel_dpio_phy.h"
> > > +#include "intel_hdcp.h"
> > >
> > > static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder,
> > > struct intel_crtc_state *crtc_state,
> > > @@ -352,6 +353,8 @@ static void intel_mst_disable_dp(struct intel_atomic_state *state,
> > > drm_dbg_kms(&i915->drm, "active links %d\n",
> > > intel_dp->active_mst_links);
> > >
> > > + intel_hdcp_disable(intel_mst->connector);
> > > +
> > > drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, connector->port);
> > >
> > > ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
> > > @@ -548,6 +551,13 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
> > >
> > > if (pipe_config->has_audio)
> > > 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(to_intel_connector(conn_state->connector),
> > > + pipe_config->cpu_transcoder,
> > > + (u8)conn_state->hdcp_content_type);
> > > }
> > >
> > > static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
> > > @@ -770,6 +780,14 @@ static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topolo
> > > intel_attach_force_audio_property(connector);
> > > intel_attach_broadcast_rgb_property(connector);
> > >
> > > +
> > > + /* TODO: Figure out how to make HDCP work on GEN12+ */
> > > + if (INTEL_GEN(dev_priv) < 12) {
> > > + ret = intel_dp_init_hdcp(intel_dig_port, intel_connector);
> > > + if (ret)
> > > + DRM_DEBUG_KMS("HDCP init failed, skipping.\n");
> > > + }
> > > +
> > > /*
> > > * Reuse the prop from the SST connector because we're
> > > * not allowed to create new props after device registration.
> > > diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > > index 6bd0e4616ee1..ddc9db8de2bc 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> > > @@ -2060,7 +2060,7 @@ int intel_hdcp_init(struct intel_connector *connector,
> > > if (!shim)
> > > return -EINVAL;
> > >
> > > - if (is_hdcp2_supported(dev_priv))
> > > + if (is_hdcp2_supported(dev_priv) && !connector->mst_port)
> > > intel_hdcp2_init(connector, port, shim);
> > >
> > > ret =
> > > --
> > > Sean Paul, Software Engineer, Google / Chromium OS
> > >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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