[PATCH 1/2] accel/ivpu: Do not trigger extra VPU reset if the VPU is idle

[Stanislaw Gruszka]

From: Andrzej Kacprowski <andrzej.kacprowski at linux.intel.com>

Turning off the PLL and entering D0i3 will reset the VPU so
an explicit IP reset is redundant.
But if the VPU is active, it may interfere with PLL disabling
and to avoid that, we have to issue an additional IP reset
to silence the VPU before turning off the PLL.

Fixes: a8fed6d1e0b9 ("accel/ivpu: Fix power down sequence")
Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski at linux.intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
---
 drivers/accel/ivpu/ivpu_hw_mtl.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/accel/ivpu/ivpu_hw_mtl.c b/drivers/accel/ivpu/ivpu_hw_mtl.c
index 3210f1b4a7dd..012a25fae16d 100644
--- a/drivers/accel/ivpu/ivpu_hw_mtl.c
+++ b/drivers/accel/ivpu/ivpu_hw_mtl.c
@@ -743,9 +743,8 @@ static int ivpu_hw_mtl_power_down(struct ivpu_device *vdev)
 {
 	int ret = 0;
 
-	if (ivpu_hw_mtl_reset(vdev)) {
+	if (!ivpu_hw_mtl_is_idle(vdev) && ivpu_hw_mtl_reset(vdev)) {
 		ivpu_err(vdev, "Failed to reset the VPU\n");
-		ret = -EIO;
 	}
 
 	if (ivpu_pll_disable(vdev)) {
@@ -753,8 +752,10 @@ static int ivpu_hw_mtl_power_down(struct ivpu_device *vdev)
 		ret = -EIO;
 	}
 
-	if (ivpu_hw_mtl_d0i3_enable(vdev))
-		ivpu_warn(vdev, "Failed to enable D0I3\n");
+	if (ivpu_hw_mtl_d0i3_enable(vdev)) {
+		ivpu_err(vdev, "Failed to enter D0I3\n");
+		ret = -EIO;
+	}
 
 	return ret;
 }
-- 
2.25.1