diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c
index aecc65b5da70..61041277be24 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c
@@ -290,6 +290,8 @@ static bool pxp_component_bound(struct intel_pxp *pxp)
 
 static int __pxp_global_teardown_final(struct intel_pxp *pxp)
 {
+	int timeout;
+
 	if (!pxp->arb_is_valid)
 		return 0;
 	/*
@@ -299,7 +301,12 @@ static int __pxp_global_teardown_final(struct intel_pxp *pxp)
 	intel_pxp_mark_termination_in_progress(pxp);
 	intel_pxp_terminate(pxp, false);
 
-	if (!wait_for_completion_timeout(&pxp->termination, msecs_to_jiffies(250)))
+	if (HAS_ENGINE(pxp->ctrl_gt, GSC0))
+		timeout = GSC_PENDING_RETRY_LATENCY_MS;
+	else
+		timeout = 250;
+
+	if (!wait_for_completion_timeout(&pxp->termination, msecs_to_jiffies(timeout)))
 		return -ETIMEDOUT;
 
 	return 0;
@@ -307,6 +314,8 @@ static int __pxp_global_teardown_final(struct intel_pxp *pxp)
 
 static int __pxp_global_teardown_restart(struct intel_pxp *pxp)
 {
+	int timeout;
+
 	if (pxp->arb_is_valid)
 		return 0;
 	/*
@@ -315,7 +324,12 @@ static int __pxp_global_teardown_restart(struct intel_pxp *pxp)
 	 */
 	pxp_queue_termination(pxp);
 
-	if (!wait_for_completion_timeout(&pxp->termination, msecs_to_jiffies(250)))
+	if (HAS_ENGINE(pxp->ctrl_gt, GSC0))
+		timeout = GSC_PENDING_RETRY_LATENCY_MS;
+	else
+		timeout = 250;
+
+	if (!wait_for_completion_timeout(&pxp->termination, msecs_to_jiffies(timeout)))
 		return -ETIMEDOUT;
 
 	return 0;
@@ -353,8 +367,20 @@ int intel_pxp_start(struct intel_pxp *pxp)
 	if (!intel_pxp_is_enabled(pxp))
 		return -ENODEV;
 
-	if (wait_for(pxp_component_bound(pxp), 250))
-		return -ENXIO;
+	if (HAS_ENGINE(pxp->ctrl_gt, GSC0)) {
+		/*
+		 * GSC-fw loading, GSC-proxy init (requiring an mei component driver) and
+		 * HuC-fw loading must all occur first before we start requesting for PXP
+		 * sessions. Checking HuC authentication (the last dependency)  will suffice.
+		 * Let's use a much larger 8 second timeout considering all the types of
+		 * dependencies prior to that.
+		 */
+		if (wait_for(intel_huc_is_authenticated(&pxp->ctrl_gt->uc.huc), 8000))
+			return -ENXIO;
+	} else {
+		if (wait_for(pxp_component_bound(pxp), 250))
+			return -ENXIO;
+	}
 
 	mutex_lock(&pxp->arb_mutex);
 
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h
index b2523d6918c7..9089e02a8c2d 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_cmd_interface_43.h
@@ -11,6 +11,7 @@
 
 /* PXP-Cmd-Op definitions */
 #define PXP43_CMDID_START_HUC_AUTH 0x0000003A
+#define PXP43_CMDID_INIT_SESSION 0x00000036
 
 /* PXP-Packet sizes for MTL's GSCCS-HECI instruction */
 #define PXP43_MAX_HECI_IN_SIZE (SZ_32K)
@@ -27,4 +28,24 @@ struct pxp43_start_huc_auth_out {
 	struct pxp_cmd_header header;
 } __packed;
 
+/* PXP-Input-Packet: Init PXP session */
+struct pxp43_create_arb_in {
+	struct pxp_cmd_header header;
+		/* header.stream_id fields for vesion 4.3 of Init PXP session: */
+		#define PXP43_INIT_SESSION_VALID BIT(0)
+		#define PXP43_INIT_SESSION_APPTYPE BIT(1)
+		#define PXP43_INIT_SESSION_APPID GENMASK(17, 2)
+	u32 protection_mode;
+		#define PXP43_INIT_SESSION_PROTECTION_ARB 0x2
+	u32 sub_session_id;
+	u32 init_flags;
+	u32 rsvd[12];
+} __packed;
+
+/* PXP-Input-Packet: Init PXP session */
+struct pxp43_create_arb_out {
+	struct pxp_cmd_header header;
+	u32 rsvd[8];
+} __packed;
+
 #endif /* __INTEL_PXP_FW_INTERFACE_43_H__ */
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
index 30aa660a975f..6f5c5dad8c16 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.c
@@ -9,6 +9,7 @@
 #include "gt/uc/intel_gsc_uc_heci_cmd_submit.h"
 
 #include "i915_drv.h"
+#include "intel_pxp_cmd_interface_42.h"
 #include "intel_pxp_cmd_interface_43.h"
 #include "intel_pxp_gsccs.h"
 #include "intel_pxp_types.h"
@@ -150,6 +151,67 @@ gsccs_send_message_retry_complete(struct intel_pxp *pxp,
 	return ret;
 }
 
+int intel_pxp_gsccs_create_session(struct intel_pxp *pxp,
+				   int arb_session_id)
+{
+	struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
+	struct pxp43_create_arb_in msg_in = {0};
+	struct pxp43_create_arb_out msg_out = {0};
+	int ret;
+
+	msg_in.header.api_version = PXP_APIVER(4, 3);
+	msg_in.header.command_id = PXP43_CMDID_INIT_SESSION;
+	msg_in.header.stream_id = (FIELD_PREP(PXP43_INIT_SESSION_APPID, arb_session_id) |
+				   FIELD_PREP(PXP43_INIT_SESSION_VALID, 1) |
+				   FIELD_PREP(PXP43_INIT_SESSION_APPTYPE, 0));
+	msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
+	msg_in.protection_mode = PXP43_INIT_SESSION_PROTECTION_ARB;
+
+	ret = gsccs_send_message_retry_complete(pxp,
+						&msg_in, sizeof(msg_in),
+						&msg_out, sizeof(msg_out), NULL);
+	if (ret)
+		drm_warn(&i915->drm, "Failed to send gsccs msg for creating-session-%d: ret=[%d]\n",
+			 arb_session_id, ret);
+	else if (msg_out.header.status != 0x0)
+		drm_warn(&i915->drm, "PXP firmware failed on creating-session-%d: status=0x%08x\n",
+			 arb_session_id, msg_out.header.status);
+
+	return ret;
+}
+
+void intel_pxp_gsccs_end_arb_fw_session(struct intel_pxp *pxp, u32 session_id)
+{
+	struct drm_i915_private *i915 = pxp->ctrl_gt->i915;
+	struct pxp42_inv_stream_key_in msg_in = {0};
+	struct pxp42_inv_stream_key_out msg_out = {0};
+	int ret = 0;
+
+	memset(&msg_in, 0, sizeof(msg_in));
+	memset(&msg_out, 0, sizeof(msg_out));
+	/*
+	 * Stream key invalidation reuses the same version 4.2 input/output
+	 * command format but firmware requires 4.3 API interaction
+	 */
+	msg_in.header.api_version = PXP_APIVER(4, 3);
+	msg_in.header.command_id = PXP42_CMDID_INVALIDATE_STREAM_KEY;
+	msg_in.header.buffer_len = sizeof(msg_in) - sizeof(msg_in.header);
+
+	msg_in.header.stream_id = FIELD_PREP(PXP_CMDHDR_EXTDATA_SESSION_VALID, 1);
+	msg_in.header.stream_id |= FIELD_PREP(PXP_CMDHDR_EXTDATA_APP_TYPE, 0);
+	msg_in.header.stream_id |= FIELD_PREP(PXP_CMDHDR_EXTDATA_SESSION_ID, session_id);
+
+	ret = gsccs_send_message_retry_complete(pxp,
+						&msg_in, sizeof(msg_in),
+						&msg_out, sizeof(msg_out), NULL);
+	if (ret)
+		drm_warn(&i915->drm, "Failed to send gsccs msg for inv-stream-session-%d: ret=[%d]\n",
+			 session_id, ret);
+	else if (msg_out.header.status != 0x0)
+		drm_warn(&i915->drm, "PXP firmware failed on inv-stream-session-%d: status=0x%08x\n",
+			 session_id, msg_out.header.status);
+}
+
 static int
 gsccs_create_buffer(struct intel_gt *gt,
 		    const char *bufname, size_t size,
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
index bd1c028bc80f..4d393f1248fe 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_gsccs.h
@@ -13,11 +13,15 @@ struct intel_pxp;
 #define GSC_REPLY_LATENCY_MS 200
 #define GSC_PENDING_RETRY_MAXCOUNT 40
 #define GSC_PENDING_RETRY_PAUSE_MS 50
+#define GSC_PENDING_RETRY_LATENCY_MS (GSC_PENDING_RETRY_MAXCOUNT * GSC_PENDING_RETRY_PAUSE_MS)
 
 #ifdef CONFIG_DRM_I915_PXP
 void intel_pxp_gsccs_fini(struct intel_pxp *pxp);
 int intel_pxp_gsccs_init(struct intel_pxp *pxp);
 
+int intel_pxp_gsccs_create_session(struct intel_pxp *pxp, int arb_session_id);
+void intel_pxp_gsccs_end_arb_fw_session(struct intel_pxp *pxp, u32 arb_session_id);
+
 #else
 static inline void intel_pxp_gsccs_fini(struct intel_pxp *pxp)
 {
diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
index b8fa6df7141b..4ddf2ee60222 100644
--- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
+++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c
@@ -7,6 +7,7 @@
 
 #include "intel_pxp.h"
 #include "intel_pxp_cmd.h"
+#include "intel_pxp_gsccs.h"
 #include "intel_pxp_session.h"
 #include "intel_pxp_tee.h"
 #include "intel_pxp_types.h"
@@ -62,7 +63,10 @@ static int pxp_create_arb_session(struct intel_pxp *pxp)
 		return -EEXIST;
 	}
 
-	ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
+	if (HAS_ENGINE(pxp->ctrl_gt, GSC0))
+		ret = intel_pxp_gsccs_create_session(pxp, ARB_SESSION);
+	else
+		ret = intel_pxp_tee_cmd_create_arb_session(pxp, ARB_SESSION);
 	if (ret) {
 		drm_err(&gt->i915->drm, "tee cmd for arb session creation failed\n");
 		return ret;
@@ -106,7 +110,10 @@ static int pxp_terminate_arb_session_and_global(struct intel_pxp *pxp)
 
 	intel_uncore_write(gt->uncore, KCR_GLOBAL_TERMINATE(pxp->kcr_base), 1);
 
-	intel_pxp_tee_end_arb_fw_session(pxp, ARB_SESSION);
+	if (HAS_ENGINE(gt, GSC0))
+		intel_pxp_gsccs_end_arb_fw_session(pxp, ARB_SESSION);
+	else
+		intel_pxp_tee_end_arb_fw_session(pxp, ARB_SESSION);
 
 	return ret;
 }
