[PATCH v2 07/11] accel/ivpu/40xx: Capture D0i3 entry host and device timestamps

[Stanislaw Gruszka]

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

The driver needs to capture the D0i3 entry timestamp to
calculate D0i3 residency time.

The D0i3 residency time and the VPU timestamp are passed
to the firmware at D0i3 exit (warm boot).

Signed-off-by: Andrzej Kacprowski <andrzej.kacprowski at linux.intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo at quicinc.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka at linux.intel.com>
---
 drivers/accel/ivpu/ivpu_hw_40xx.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/accel/ivpu/ivpu_hw_40xx.c b/drivers/accel/ivpu/ivpu_hw_40xx.c
index eb8218d15f01..0eb9c827f6dc 100644
--- a/drivers/accel/ivpu/ivpu_hw_40xx.c
+++ b/drivers/accel/ivpu/ivpu_hw_40xx.c
@@ -879,10 +879,18 @@ static bool ivpu_hw_40xx_is_idle(struct ivpu_device *vdev)
 	       REG_TEST_FLD(VPU_40XX_BUTTRESS_VPU_STATUS, IDLE, val);
 }
 
+static void ivpu_hw_40xx_save_d0i3_entry_timestamp(struct ivpu_device *vdev)
+{
+	vdev->hw->d0i3_entry_host_ts = ktime_get_boottime();
+	vdev->hw->d0i3_entry_vpu_ts = REGV_RD64(VPU_40XX_CPU_SS_TIM_PERF_EXT_FREE_CNT);
+}
+
 static int ivpu_hw_40xx_power_down(struct ivpu_device *vdev)
 {
 	int ret = 0;
 
+	ivpu_hw_40xx_save_d0i3_entry_timestamp(vdev);
+
 	if (!ivpu_hw_40xx_is_idle(vdev) && ivpu_hw_40xx_reset(vdev))
 		ivpu_warn(vdev, "Failed to reset the VPU\n");
 
-- 
2.25.1