From 4513928e86ae1c8e791e417c1877b5774fc060d8 Mon Sep 17 00:00:00 2001
From: Anshuman Gupta <anshuman.gupta@intel.com>
Date: Tue, 30 Jun 2020 13:50:48 +0530
Subject: drm/i915/hdcp: Update CP as per the kernel internal state
Git-commit: 33f9a623bfc6bed3b9586f68cb4a9ea332589791
Patch-mainline: v5.9-rc1
References: jsc#SLE-12680, jsc#SLE-12880, jsc#SLE-12882, jsc#SLE-12883, jsc#SLE-13496, jsc#SLE-15322

Content Protection property should be updated as per the kernel
internal state. Let's say if Content protection is disabled
by userspace, CP property should be set to UNDESIRED so that
reauthentication will not happen until userspace request it again,
but when kernel disables the HDCP due to any DDI disabling sequences
like modeset/DPMS operation, kernel should set the property to
DESIRED, so that when opportunity arises, kernel will start the
HDCP authentication on its own.

Somewhere in the line, state machine to set content protection to
DESIRED from kernel was broken and IGT coverage was missing for it.
This patch fixes it.

v2:
- Fixing hdcp CP state in connector atomic check function
  intel_hdcp_atomic_check(). [Maarten]
  This will require to check hdcp->value in intel_hdcp_update_pipe()
  in order to avoid enabling hdcp, if it was already enabled.

v3:
- Rebased.

Cc: Ramalingam C <ramalingam.c@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Anshuman Gupta <anshuman.gupta@intel.com>
Link: https://patchwork.freedesktop.org/patch/350962/?series=72664&rev=2 #v1
Link: https://patchwork.freedesktop.org/patch/359396/?series=72251&rev=3 #v2
Reviewed-by: Ramalingam C <ramalingam.c@intel.com>
Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200630082048.22308-1-anshuman.gupta@intel.com
Signed-off-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/i915/display/intel_hdcp.c | 27 +++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
index 1b6dadfce4eb..3d42888d2020 100644
--- a/drivers/gpu/drm/i915/display/intel_hdcp.c
+++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
@@ -2086,6 +2086,7 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 		(conn_state->hdcp_content_type != hdcp->content_type &&
 		 conn_state->content_protection !=
 		 DRM_MODE_CONTENT_PROTECTION_UNDESIRED);
+	bool desired_and_not_enabled = false;
 
 	/*
 	 * During the HDCP encryption session if Type change is requested,
@@ -2108,8 +2109,15 @@ void intel_hdcp_update_pipe(struct intel_atomic_state *state,
 	}
 
 	if (conn_state->content_protection ==
-	    DRM_MODE_CONTENT_PROTECTION_DESIRED ||
-	    content_protection_type_changed)
+	    DRM_MODE_CONTENT_PROTECTION_DESIRED) {
+		mutex_lock(&hdcp->mutex);
+		/* Avoid enabling hdcp, if it already ENABLED */
+		desired_and_not_enabled =
+			hdcp->value != DRM_MODE_CONTENT_PROTECTION_ENABLED;
+		mutex_unlock(&hdcp->mutex);
+	}
+
+	if (desired_and_not_enabled || content_protection_type_changed)
 		intel_hdcp_enable(connector,
 				  crtc_state->cpu_transcoder,
 				  (u8)conn_state->hdcp_content_type);
@@ -2158,6 +2166,19 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 		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.
@@ -2170,8 +2191,6 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
 			return;
 	}
 
-	crtc_state = drm_atomic_get_new_crtc_state(new_state->state,
-						   new_state->crtc);
 	crtc_state->mode_changed = true;
 }
 
-- 
2.29.2