diff --git a/drivers/gpu/drm/xe/xe_sysctrl.c b/drivers/gpu/drm/xe/xe_sysctrl.c
index 1db20be8158b..62ccc9be71b4 100644
--- a/drivers/gpu/drm/xe/xe_sysctrl.c
+++ b/drivers/gpu/drm/xe/xe_sysctrl.c
@@ -85,7 +85,6 @@ int xe_sysctrl_init(struct xe_device *xe)
 		return ret;
 
 	xe->soc_remapper.set_sysctrl_region(xe, SYSCTRL_MAILBOX_INDEX);
-	xe_sysctrl_mailbox_init(sc);
 	INIT_WORK(&sc->work, xe_sysctrl_work);
 
 	return devm_add_action_or_reset(xe->drm.dev, sysctrl_fini, xe);
@@ -114,12 +113,10 @@ void xe_sysctrl_irq_handler(struct xe_device *xe, u32 master_ctl)
  * @xe: xe device instance
  *
  * Invoked during system resume (S3/S4 to S0) and runtime resume from D3cold.
- * Restores SoC remapper configuration and reinitializes mailbox interface.
+ * Restores SoC remapper configuration.
  */
 void xe_sysctrl_pm_resume(struct xe_device *xe)
 {
-	struct xe_sysctrl *sc = &xe->sc;
-
 	if (!xe->info.has_soc_remapper_sysctrl)
 		return;
 
@@ -127,6 +124,4 @@ void xe_sysctrl_pm_resume(struct xe_device *xe)
 		return;
 
 	xe->soc_remapper.set_sysctrl_region(xe, SYSCTRL_MAILBOX_INDEX);
-
-	xe_sysctrl_mailbox_init(sc);
 }
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_mailbox.c b/drivers/gpu/drm/xe/xe_sysctrl_mailbox.c
index e13eebaac1d0..72baf1aa4b3a 100644
--- a/drivers/gpu/drm/xe/xe_sysctrl_mailbox.c
+++ b/drivers/gpu/drm/xe/xe_sysctrl_mailbox.c
@@ -145,6 +145,7 @@ static int sysctrl_send_frames(struct xe_sysctrl *sc,
 	struct xe_device *xe = sc_to_xe(sc);
 	u32 ctrl_reg, total_frames, frame;
 	size_t bytes_sent, frame_size;
+	bool phase;
 
 	total_frames = DIV_ROUND_UP(cmd_size, XE_SYSCTRL_MB_FRAME_SIZE);
 
@@ -153,7 +154,8 @@ static int sysctrl_send_frames(struct xe_sysctrl *sc,
 		return -EBUSY;
 	}
 
-	sc->phase_bit ^= 1;
+	ctrl_reg = xe_mmio_read32(sc->mmio, SYSCTRL_MB_CTRL);
+	phase = !(ctrl_reg & SYSCTRL_FRAME_PHASE);
 	bytes_sent = 0;
 
 	for (frame = 0; frame < total_frames; frame++) {
@@ -161,7 +163,6 @@ static int sysctrl_send_frames(struct xe_sysctrl *sc,
 
 		if (sysctrl_write_frame(sc, mbox_cmd + bytes_sent, frame_size)) {
 			xe_err(xe, "sysctrl: Failed to write frame %u\n", frame);
-			sc->phase_bit = 0;
 			return -EIO;
 		}
 
@@ -169,13 +170,12 @@ static int sysctrl_send_frames(struct xe_sysctrl *sc,
 			   REG_FIELD_PREP(SYSCTRL_FRAME_CURRENT_MASK, frame) |
 			   REG_FIELD_PREP(SYSCTRL_FRAME_TOTAL_MASK, total_frames - 1) |
 			   SYSCTRL_MB_CTRL_CMD |
-			   (sc->phase_bit ? SYSCTRL_FRAME_PHASE : 0);
+			   (phase ? SYSCTRL_FRAME_PHASE : 0);
 
 		xe_mmio_write32(sc->mmio, SYSCTRL_MB_CTRL, ctrl_reg);
 
 		if (!sysctrl_wait_bit_clear(sc, SYSCTRL_MB_CTRL_RUN_BUSY, timeout_ms)) {
 			xe_err(xe, "sysctrl: Frame %u acknowledgment timeout\n", frame);
-			sc->phase_bit = 0;
 			return -ETIMEDOUT;
 		}
 
@@ -321,20 +321,6 @@ void xe_sysctrl_create_command(struct xe_sysctrl_mailbox_command *command, u8 gr
 	command->data_out_len = response_len;
 }
 
-/**
- * xe_sysctrl_mailbox_init - Initialize System Controller mailbox interface
- * @sc: System controller structure
- *
- * Initialize system controller mailbox interface for communication.
- */
-void xe_sysctrl_mailbox_init(struct xe_sysctrl *sc)
-{
-	u32 ctrl_reg;
-
-	ctrl_reg = xe_mmio_read32(sc->mmio, SYSCTRL_MB_CTRL);
-	sc->phase_bit = (ctrl_reg & SYSCTRL_FRAME_PHASE) ? 1 : 0;
-}
-
 /**
  * xe_sysctrl_send_command() - Send mailbox command to System Controller
  * @sc: System Controller instance
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_mailbox.h b/drivers/gpu/drm/xe/xe_sysctrl_mailbox.h
index fb434cc165b2..f0d5e3d7f5e3 100644
--- a/drivers/gpu/drm/xe/xe_sysctrl_mailbox.h
+++ b/drivers/gpu/drm/xe/xe_sysctrl_mailbox.h
@@ -26,7 +26,6 @@ struct xe_sysctrl_mailbox_command;
 void xe_sysctrl_create_command(struct xe_sysctrl_mailbox_command *command, u8 group_id, u8 cmd_id,
 			       void *request, size_t request_len, void *response,
 			       size_t response_len);
-void xe_sysctrl_mailbox_init(struct xe_sysctrl *sc);
 int xe_sysctrl_send_command(struct xe_sysctrl *sc,
 			    struct xe_sysctrl_mailbox_command *cmd,
 			    size_t *rdata_len);
diff --git a/drivers/gpu/drm/xe/xe_sysctrl_types.h b/drivers/gpu/drm/xe/xe_sysctrl_types.h
index 66ba24f43017..98c2f473f7c6 100644
--- a/drivers/gpu/drm/xe/xe_sysctrl_types.h
+++ b/drivers/gpu/drm/xe/xe_sysctrl_types.h
@@ -26,9 +26,6 @@ struct xe_sysctrl {
 	/** @cmd_lock: Mutex protecting mailbox command operations */
 	struct mutex cmd_lock;
 
-	/** @phase_bit: Message boundary phase toggle bit (0 or 1) */
-	bool phase_bit;
-
 	/** @work: Pending events worker */
 	struct work_struct work;