[PATCH 4/7] accel/ivpu: Fix power down sequence

[Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>]

Remove FPGA WA on power_down to skip checking for noc quiescent state.

Put VPU in reset before powering it down and skip manipulating
registers that are reset by the VPU reset.

This fixes power down errors there VPU is powered down just after VPU
is booted.

Co-developed-by: Jacek Lawrynowicz <jacek.lawrynowicz@xxxxxxxxxxxxxxx>
Signed-off-by: Jacek Lawrynowicz <jacek.lawrynowicz@xxxxxxxxxxxxxxx>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
---
 drivers/accel/ivpu/ivpu_hw_mtl.c | 37 ++------------------------------
 1 file changed, 2 insertions(+), 35 deletions(-)

diff --git a/drivers/accel/ivpu/ivpu_hw_mtl.c b/drivers/accel/ivpu/ivpu_hw_mtl.c
index 62bfaa9081c4..70ca6de78060 100644
--- a/drivers/accel/ivpu/ivpu_hw_mtl.c
+++ b/drivers/accel/ivpu/ivpu_hw_mtl.c
@@ -403,11 +403,6 @@ static int ivpu_boot_host_ss_axi_enable(struct ivpu_device *vdev)
 	return ivpu_boot_host_ss_axi_drive(vdev, true);
 }
 
-static int ivpu_boot_host_ss_axi_disable(struct ivpu_device *vdev)
-{
-	return ivpu_boot_host_ss_axi_drive(vdev, false);
-}
-
 static int ivpu_boot_host_ss_top_noc_drive(struct ivpu_device *vdev, bool enable)
 {
 	int ret;
@@ -441,11 +436,6 @@ static int ivpu_boot_host_ss_top_noc_enable(struct ivpu_device *vdev)
 	return ivpu_boot_host_ss_top_noc_drive(vdev, true);
 }
 
-static int ivpu_boot_host_ss_top_noc_disable(struct ivpu_device *vdev)
-{
-	return ivpu_boot_host_ss_top_noc_drive(vdev, false);
-}
-
 static void ivpu_boot_pwr_island_trickle_drive(struct ivpu_device *vdev, bool enable)
 {
 	u32 val = REGV_RD32(MTL_VPU_HOST_SS_AON_PWR_ISLAND_TRICKLE_EN0);
@@ -504,16 +494,6 @@ static void ivpu_boot_dpu_active_drive(struct ivpu_device *vdev, bool enable)
 	REGV_WR32(MTL_VPU_HOST_SS_AON_DPU_ACTIVE, val);
 }
 
-static int ivpu_boot_pwr_domain_disable(struct ivpu_device *vdev)
-{
-	ivpu_boot_dpu_active_drive(vdev, false);
-	ivpu_boot_pwr_island_isolation_drive(vdev, true);
-	ivpu_boot_pwr_island_trickle_drive(vdev, false);
-	ivpu_boot_pwr_island_drive(vdev, false);
-
-	return ivpu_boot_wait_for_pwr_island_status(vdev, 0x0);
-}
-
 static int ivpu_boot_pwr_domain_enable(struct ivpu_device *vdev)
 {
 	int ret;
@@ -797,21 +777,8 @@ static int ivpu_hw_mtl_power_down(struct ivpu_device *vdev)
 {
 	int ret = 0;
 
-	/* FPGA requires manual clearing of IP_Reset bit by enabling quiescent state */
-	if (ivpu_is_fpga(vdev)) {
-		if (ivpu_boot_host_ss_top_noc_disable(vdev)) {
-			ivpu_err(vdev, "Failed to disable TOP NOC\n");
-			ret = -EIO;
-		}
-
-		if (ivpu_boot_host_ss_axi_disable(vdev)) {
-			ivpu_err(vdev, "Failed to disable AXI\n");
-			ret = -EIO;
-		}
-	}
-
-	if (ivpu_boot_pwr_domain_disable(vdev)) {
-		ivpu_err(vdev, "Failed to disable power domain\n");
+	if (ivpu_hw_mtl_reset(vdev)) {
+		ivpu_err(vdev, "Failed to reset the VPU\n");
 		ret = -EIO;
 	}
 
-- 
2.25.1