[PATCH] accel/ivpu: Remove disable_d0i3_msg workaround

[Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>]

All published NPU firmware versions support D0i3 delayed entry
flow, making this workaround obsolete. It was originally added as
a safety measure for potential firmware bugs.

Recent firmware dropped legacy D0i3 entry support, so the workaround
can't be used anyway. Hardcode d0i3_delayed_entry boot param to 1 to
ensure older firmware works in the correct mode.

No functional changes, just dead code cleanup.

Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski@linux.intel.com>
---
 drivers/accel/ivpu/ivpu_drv.h     |  3 ---
 drivers/accel/ivpu/ivpu_fw.c      | 23 ++---------------------
 drivers/accel/ivpu/ivpu_jsm_msg.c |  3 ---
 drivers/accel/ivpu/vpu_boot_api.h |  6 ++++--
 4 files changed, 6 insertions(+), 29 deletions(-)

diff --git a/drivers/accel/ivpu/ivpu_drv.h b/drivers/accel/ivpu/ivpu_drv.h
index c77dde310e81..9eefbbb7ba11 100644
--- a/drivers/accel/ivpu/ivpu_drv.h
+++ b/drivers/accel/ivpu/ivpu_drv.h
@@ -111,7 +111,6 @@ struct ivpu_wa_table {
 	bool clear_runtime_mem;
 	bool interrupt_clear_with_0;
 	bool disable_clock_relinquish;
-	bool disable_d0i3_msg;
 	bool wp0_during_power_up;
 	bool disable_d0i2;
 };
@@ -220,8 +219,6 @@ extern bool ivpu_force_snoop;
 #define IVPU_TEST_MODE_FW_TEST            BIT(0)
 #define IVPU_TEST_MODE_NULL_HW            BIT(1)
 #define IVPU_TEST_MODE_NULL_SUBMISSION    BIT(2)
-#define IVPU_TEST_MODE_D0I3_MSG_DISABLE   BIT(4)
-#define IVPU_TEST_MODE_D0I3_MSG_ENABLE    BIT(5)
 #define IVPU_TEST_MODE_MIP_DISABLE        BIT(6)
 #define IVPU_TEST_MODE_DISABLE_TIMEOUTS   BIT(8)
 #define IVPU_TEST_MODE_TURBO_ENABLE       BIT(9)
diff --git a/drivers/accel/ivpu/ivpu_fw.c b/drivers/accel/ivpu/ivpu_fw.c
index 107f8ad31050..7db199e04f7c 100644
--- a/drivers/accel/ivpu/ivpu_fw.c
+++ b/drivers/accel/ivpu/ivpu_fw.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (C) 2020-2025 Intel Corporation
+ * Copyright (C) 2020-2026 Intel Corporation
  */
 
 #include <linux/firmware.h>
@@ -347,22 +347,6 @@ static void ivpu_fw_release(struct ivpu_device *vdev)
 	release_firmware(vdev->fw->file);
 }
 
-/* Initialize workarounds that depend on FW version */
-static void
-ivpu_fw_init_wa(struct ivpu_device *vdev)
-{
-	const struct vpu_firmware_header *fw_hdr = (const void *)vdev->fw->file->data;
-
-	if (IVPU_FW_CHECK_API_VER_LT(vdev, fw_hdr, BOOT, 3, 17) ||
-	    (ivpu_test_mode & IVPU_TEST_MODE_D0I3_MSG_DISABLE))
-		vdev->wa.disable_d0i3_msg = true;
-
-	/* Force enable the feature for testing purposes */
-	if (ivpu_test_mode & IVPU_TEST_MODE_D0I3_MSG_ENABLE)
-		vdev->wa.disable_d0i3_msg = false;
-
-	IVPU_PRINT_WA(disable_d0i3_msg);
-}
 
 static int ivpu_fw_mem_init(struct ivpu_device *vdev)
 {
@@ -480,8 +464,6 @@ int ivpu_fw_init(struct ivpu_device *vdev)
 	if (ret)
 		goto err_fw_release;
 
-	ivpu_fw_init_wa(vdev);
-
 	ret = ivpu_fw_mem_init(vdev);
 	if (ret)
 		goto err_fw_release;
@@ -711,8 +693,7 @@ void ivpu_fw_boot_params_setup(struct ivpu_device *vdev, struct vpu_boot_params
 	if (vdev->fw->sched_mode == VPU_SCHEDULING_MODE_HW)
 		boot_params->vpu_focus_present_timer_ms = IVPU_FOCUS_PRESENT_TIMER_MS;
 	boot_params->dvfs_mode = vdev->fw->dvfs_mode;
-	if (!IVPU_WA(disable_d0i3_msg))
-		boot_params->d0i3_delayed_entry = 1;
+	boot_params->d0i3_delayed_entry = 1;
 	boot_params->d0i3_residency_time_us = 0;
 	boot_params->d0i3_entry_vpu_ts = 0;
 	if (IVPU_WA(disable_d0i2))
diff --git a/drivers/accel/ivpu/ivpu_jsm_msg.c b/drivers/accel/ivpu/ivpu_jsm_msg.c
index 17b42a76aef9..6361fe50596e 100644
--- a/drivers/accel/ivpu/ivpu_jsm_msg.c
+++ b/drivers/accel/ivpu/ivpu_jsm_msg.c
@@ -275,9 +275,6 @@ int ivpu_jsm_pwr_d0i3_enter(struct ivpu_device *vdev)
 	struct vpu_jsm_msg resp;
 	int ret;
 
-	if (IVPU_WA(disable_d0i3_msg))
-		return 0;
-
 	req.payload.pwr_d0i3_enter.send_response = 1;
 
 	ret = ivpu_ipc_send_receive_internal(vdev, &req, VPU_JSM_MSG_PWR_D0I3_ENTER_DONE, &resp,
diff --git a/drivers/accel/ivpu/vpu_boot_api.h b/drivers/accel/ivpu/vpu_boot_api.h
index a41170bbc6b7..06c092d5e675 100644
--- a/drivers/accel/ivpu/vpu_boot_api.h
+++ b/drivers/accel/ivpu/vpu_boot_api.h
@@ -41,7 +41,7 @@
 /**
  * API header changed (field names, documentation, formatting) but API itself has not been changed
  */
-#define VPU_BOOT_API_VER_PATCH 4
+#define VPU_BOOT_API_VER_PATCH 5
 
 /**
  * Index in the API version table
@@ -320,9 +320,11 @@ struct vpu_boot_params {
 	u64 dvfs_param;
 	/**
 	 * D0i3 delayed entry
-	 * Bit0: Disable CPU state save on D0i2 entry flow.
+	 * Bit 0: Disable CPU state save on D0i2 entry flow.
 	 *       0: Every D0i2 entry saves state. Save state IPC message ignored.
 	 *       1: IPC message required to save state on D0i3 entry flow.
+	 * NOTE: This parameter is deprecated starting NPU50xx+. Bit 0 is now hardcoded to 1,
+	 * meaning CPU state save always requires IPC message on D0i3 entry flow.
 	 */
 	u32 d0i3_delayed_entry;
 	/** Time spent by VPU in D0i3 state */
-- 
2.43.0