[PATCH v9 36/39] drm/i915: Commit CP without modeset

[Ramalingam C]

Commits the content protection change of a connector,
without crtc modeset. This improves the user experience.

Originally proposed by Sean Paul at v3 of HDCP1.4 framework
https://patchwork.freedesktop.org/patch/191759/. For some
reason this was dropped, but needed for the proper functionality
of HDCP encryption.

Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
Suggested-by: Sean Paul <seanpaul at chromium.org>
---
 drivers/gpu/drm/i915/intel_ddi.c     |  7 -------
 drivers/gpu/drm/i915/intel_display.c | 10 ++++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  5 +++++
 drivers/gpu/drm/i915/intel_hdcp.c    | 32 ++++++++++++++++++++++++++++----
 4 files changed, 43 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 92c0bf70fe09..feb78780976d 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -3548,11 +3548,6 @@ static void intel_enable_ddi(struct intel_encoder *encoder,
 		intel_enable_ddi_hdmi(encoder, crtc_state, conn_state);
 	else
 		intel_enable_ddi_dp(encoder, crtc_state, 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));
 }
 
 static void intel_disable_ddi_dp(struct intel_encoder *encoder,
@@ -3595,8 +3590,6 @@ static void intel_disable_ddi(struct intel_encoder *encoder,
 			      const struct intel_crtc_state *old_crtc_state,
 			      const struct drm_connector_state *old_conn_state)
 {
-	intel_hdcp_disable(to_intel_connector(old_conn_state->connector));
-
 	if (intel_crtc_has_type(old_crtc_state, INTEL_OUTPUT_HDMI))
 		intel_disable_ddi_hdmi(encoder, old_crtc_state, old_conn_state);
 	else
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 13e5650b6f31..05bae91512cd 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12922,6 +12922,8 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_crtc_state *old_crtc_state, *new_crtc_state;
 	struct intel_crtc_state *new_intel_crtc_state, *old_intel_crtc_state;
+	struct drm_connector_state *old_conn_state, *new_conn_state;
+	struct drm_connector *connector;
 	struct drm_crtc *crtc;
 	struct intel_crtc *intel_crtc;
 	u64 put_domains[I915_MAX_PIPES] = {};
@@ -13015,9 +13017,17 @@ static void intel_atomic_commit_tail(struct drm_atomic_state *state)
 		}
 	}
 
+	for_each_oldnew_connector_in_state(state, connector, old_conn_state,
+					   new_conn_state, i)
+		intel_hdcp_atomic_pre_commit(connector, old_conn_state,
+					     new_conn_state);
+
 	/* Now enable the clocks, plane, pipe, and connectors that we set up. */
 	dev_priv->display.update_crtcs(state);
 
+	for_each_new_connector_in_state(state, connector, new_conn_state, i)
+		intel_hdcp_atomic_commit(connector, new_conn_state);
+
 	/* FIXME: We should call drm_atomic_helper_commit_hw_done() here
 	 * already, but still need the state for the delayed optimization. To
 	 * fix this:
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 60d1359e55f4..40357e17324e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -2100,6 +2100,11 @@ static inline void intel_backlight_device_unregister(struct intel_connector *con
 void intel_hdcp_atomic_check(struct drm_connector *connector,
 			     struct drm_connector_state *old_state,
 			     struct drm_connector_state *new_state);
+void intel_hdcp_atomic_pre_commit(struct drm_connector *connector,
+				  struct drm_connector_state *old_state,
+				  struct drm_connector_state *new_state);
+void intel_hdcp_atomic_commit(struct drm_connector *connector,
+			      struct drm_connector_state *new_state);
 int intel_hdcp_init(struct intel_connector *connector,
 		    const struct intel_hdcp_shim *hdcp_shim,
 		    bool hdcp2_supported);
diff --git a/drivers/gpu/drm/i915/intel_hdcp.c b/drivers/gpu/drm/i915/intel_hdcp.c
index cafda8903b50..42327ed30903 100644
--- a/drivers/gpu/drm/i915/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/intel_hdcp.c
@@ -1760,7 +1760,6 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 {
 	uint64_t old_cp = old_state->content_protection;
 	uint64_t new_cp = new_state->content_protection;
-	struct drm_crtc_state *crtc_state;
 
 	if (!new_state->crtc) {
 		/*
@@ -1781,10 +1780,35 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 	    (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
 	     new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED))
 		return;
+}
+
+void intel_hdcp_atomic_pre_commit(struct drm_connector *connector,
+				  struct drm_connector_state *old_state,
+				  struct drm_connector_state *new_state)
+{
+	u64 old_cp = old_state->content_protection;
+	u64 new_cp = new_state->content_protection;
+
+	/*
+	 * Disable HDCP if the connector is becoming disabled, or if requested
+	 * via the property.
+	 */
+	if ((!new_state->crtc &&
+	     old_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED) ||
+	    (new_state->crtc &&
+	     old_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED &&
+	     new_cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
+		intel_hdcp_disable(to_intel_connector(connector));
+}
+
+void intel_hdcp_atomic_commit(struct drm_connector *connector,
+			      struct drm_connector_state *new_state)
+{
+	u64 new_cp = new_state->content_protection;
 
-	crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
-						   new_state->crtc);
-	crtc_state->mode_changed = true;
+	/* Enable hdcp if it's desired */
+	if (new_state->crtc && new_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED)
+		intel_hdcp_enable(to_intel_connector(connector));
 }
 
 /* Handles the CP_IRQ raised from the DP HDCP sink */
-- 
2.7.4