[PATCH v6 01/10] drm/hdcp: Add drm_hdcp_atomic_check()

[Mark Yacoub <markyacoub@chromium.org>]

From: Sean Paul <seanpaul@chromium.org>

This patch moves the hdcp atomic check from i915 to drm_hdcp so other
drivers can use it. No functional changes, just cleaned up some of the
code when moving it over.

Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Abhinav Kumar <abhinavk@codeaurora.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Mark Yacoub <markyacoub@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-2-sean@poorly.run #v1
Link: https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-2-sean@poorly.run #v2
Link: https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-2-sean@poorly.run #v3
Link: https://patchwork.freedesktop.org/patch/msgid/20211105030434.2828845-2-sean@poorly.run #v4
Link: https://patchwork.freedesktop.org/patch/msgid/20220411204741.1074308-2-sean@poorly.run #v5

Changes in v2:
-None
Changes in v3:
-None
Changes in v4:
-None
Changes in v5:
-None
Changes in V6:
-Rebase: move helper from drm_hdcp.c to drm_hdcp_helper.c

---
 drivers/gpu/drm/display/drm_hdcp_helper.c   | 69 +++++++++++++++++++++
 drivers/gpu/drm/i915/display/intel_atomic.c |  4 +-
 drivers/gpu/drm/i915/display/intel_hdcp.c   | 47 --------------
 drivers/gpu/drm/i915/display/intel_hdcp.h   |  3 -
 include/drm/display/drm_hdcp_helper.h       |  3 +
 5 files changed, 74 insertions(+), 52 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_hdcp_helper.c b/drivers/gpu/drm/display/drm_hdcp_helper.c
index e78999c72bd7..7d910523b05f 100644
--- a/drivers/gpu/drm/display/drm_hdcp_helper.c
+++ b/drivers/gpu/drm/display/drm_hdcp_helper.c
@@ -20,6 +20,7 @@
 #include <drm/drm_property.h>
 #include <drm/drm_mode_object.h>
 #include <drm/drm_connector.h>
+#include <drm/drm_atomic.h>
 
 static inline void drm_hdcp_print_ksv(const u8 *ksv)
 {
@@ -419,3 +420,71 @@ void drm_hdcp_update_content_protection(struct drm_connector *connector,
 				 dev->mode_config.content_protection_property);
 }
 EXPORT_SYMBOL(drm_hdcp_update_content_protection);
+
+/**
+ * drm_hdcp_atomic_check - Helper for drivers to call during connector->atomic_check
+ *
+ * @state: pointer to the atomic state being checked
+ * @connector: drm_connector on which content protection state needs an update
+ *
+ * This function can be used by display drivers to perform an atomic check on the
+ * hdcp state elements. If hdcp state has changed, this function will set
+ * mode_changed on the crtc driving the connector so it can update its hardware
+ * to match the hdcp state.
+ */
+void drm_hdcp_atomic_check(struct drm_connector *connector,
+			   struct drm_atomic_state *state)
+{
+	struct drm_connector_state *new_conn_state, *old_conn_state;
+	struct drm_crtc_state *new_crtc_state;
+	u64 old_hdcp, new_hdcp;
+
+	old_conn_state = drm_atomic_get_old_connector_state(state, connector);
+	old_hdcp = old_conn_state->content_protection;
+
+	new_conn_state = drm_atomic_get_new_connector_state(state, connector);
+	new_hdcp = new_conn_state->content_protection;
+
+	if (!new_conn_state->crtc) {
+		/*
+		 * If the connector is being disabled with CP enabled, mark it
+		 * desired so it's re-enabled when the connector is brought back
+		 */
+		if (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
+			new_conn_state->content_protection =
+				DRM_MODE_CONTENT_PROTECTION_DESIRED;
+		return;
+	}
+
+	new_crtc_state =
+		drm_atomic_get_new_crtc_state(state, new_conn_state->crtc);
+	/*
+	* Fix the HDCP uapi content protection state in case of modeset.
+	* FIXME: As per HDCP content protection property uapi doc, an uevent()
+	* need to be sent if there is transition from ENABLED->DESIRED.
+	*/
+	if (drm_atomic_crtc_needs_modeset(new_crtc_state) &&
+	    (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
+	     new_hdcp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
+		new_conn_state->content_protection =
+			DRM_MODE_CONTENT_PROTECTION_DESIRED;
+
+	/*
+	 * Nothing to do if content type is unchanged and one of:
+	 *  - state didn't change
+	 *  - HDCP was activated since the last commit
+	 *  - attempting to set to desired while already enabled
+	 */
+	if (old_hdcp == new_hdcp ||
+	    (old_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
+	     new_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED) ||
+	    (old_hdcp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
+	     new_hdcp == DRM_MODE_CONTENT_PROTECTION_DESIRED)) {
+		if (old_conn_state->hdcp_content_type ==
+		    new_conn_state->hdcp_content_type)
+			return;
+	}
+
+	new_crtc_state->mode_changed = true;
+}
+EXPORT_SYMBOL(drm_hdcp_atomic_check);
diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index 18f0a5ae3bac..8a473199c4bf 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -32,6 +32,7 @@
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_fourcc.h>
+#include <drm/display/drm_hdcp_helper.h>
 
 #include "i915_drv.h"
 #include "i915_reg.h"
@@ -39,7 +40,6 @@
 #include "intel_cdclk.h"
 #include "intel_display_types.h"
 #include "intel_global_state.h"
-#include "intel_hdcp.h"
 #include "intel_psr.h"
 #include "skl_universal_plane.h"
 
@@ -123,7 +123,7 @@ int intel_digital_connector_atomic_check(struct drm_connector *conn,
 		to_intel_digital_connector_state(old_state);
 	struct drm_crtc_state *crtc_state;
 
-	intel_hdcp_atomic_check(conn, old_state, new_state);
+	drm_hdcp_atomic_check(conn, state);
 
 	if (!new_state->crtc)
 		return 0;
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 6406fd487ee5..396d2cef000a 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -2524,53 +2524,6 @@ void intel_hdcp_cleanup(struct intel_connector *connector)
 	mutex_unlock(&hdcp->mutex);
 }
 
-void intel_hdcp_atomic_check(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;
-	struct drm_crtc_state *crtc_state;
-
-	if (!new_state->crtc) {
-		/*
-		 * If the connector is being disabled with CP enabled, mark it
-		 * desired so it's re-enabled when the connector is brought back
-		 */
-		if (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)
-			new_state->content_protection =
-				DRM_MODE_CONTENT_PROTECTION_DESIRED;
-		return;
-	}
-
-	crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
-						   new_state->crtc);
-	/*
-	 * Fix the HDCP uapi content protection state in case of modeset.
-	 * FIXME: As per HDCP content protection property uapi doc, an uevent()
-	 * need to be sent if there is transition from ENABLED->DESIRED.
-	 */
-	if (drm_atomic_crtc_needs_modeset(crtc_state) &&
-	    (old_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED &&
-	    new_cp != DRM_MODE_CONTENT_PROTECTION_UNDESIRED))
-		new_state->content_protection =
-			DRM_MODE_CONTENT_PROTECTION_DESIRED;
-
-	/*
-	 * Nothing to do if the state didn't change, or HDCP was activated since
-	 * the last commit. And also no change in hdcp content type.
-	 */
-	if (old_cp == new_cp ||
-	    (old_cp == DRM_MODE_CONTENT_PROTECTION_DESIRED &&
-	     new_cp == DRM_MODE_CONTENT_PROTECTION_ENABLED)) {
-		if (old_state->hdcp_content_type ==
-				new_state->hdcp_content_type)
-			return;
-	}
-
-	crtc_state->mode_changed = true;
-}
-
 /* Handles the CP_IRQ raised from the DP HDCP sink */
 void intel_hdcp_handle_cp_irq(struct intel_connector *connector)
 {
diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.h b/drivers/gpu/drm/i915/display/intel_hdcp.h
index 8f53b0c7fe5c..7c5fd84a7b65 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.h
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.h
@@ -22,9 +22,6 @@ struct intel_digital_port;
 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);
 int intel_hdcp_init(struct intel_connector *connector,
 		    struct intel_digital_port *dig_port,
 		    const struct intel_hdcp_shim *hdcp_shim);
diff --git a/include/drm/display/drm_hdcp_helper.h b/include/drm/display/drm_hdcp_helper.h
index 8aaf87bf2735..dd02b2e72a50 100644
--- a/include/drm/display/drm_hdcp_helper.h
+++ b/include/drm/display/drm_hdcp_helper.h
@@ -11,6 +11,7 @@
 
 #include <drm/display/drm_hdcp.h>
 
+struct drm_atomic_state;
 struct drm_device;
 struct drm_connector;
 
@@ -18,5 +19,7 @@ int drm_hdcp_check_ksvs_revoked(struct drm_device *dev, u8 *ksvs, u32 ksv_count)
 int drm_connector_attach_content_protection_property(struct drm_connector *connector,
 						     bool hdcp_content_type);
 void drm_hdcp_update_content_protection(struct drm_connector *connector, u64 val);
+void drm_hdcp_atomic_check(struct drm_connector *connector,
+			   struct drm_atomic_state *state);
 
 #endif
-- 
2.39.0.246.g2a6d74b583-goog