[PATCH 3/6] accel/ivpu/40xx: Ensure clock resource ownership Ack before Power-Up

[Jeffrey Hugo]

On 9/25/2023 6:11 AM, Stanislaw Gruszka wrote:
> From: Karol Wachowski <karol.wachowski at linux.intel.com>
> 
> We need to wait for the CLOCK_RESOURCE_OWN_ACK bit to be set
> after configuring the workpoint. This step ensures that the VPU
> microcontroller clock is actively toggling and ready for operation.
> 
> Previously, we relied solely on the READY bit in the VPU_STATUS
> register, which indicated the completion of the workpoint download.
> However, this approach was insufficient, as the READY bit could be set
> while the device was still running on a sideband clock until the PLL
> locked. To guarantee that the PLL is locked and the device is running on
> the main clock source, we now wait for the CLOCK_RESOURCE_OWN_ACK before
> proceeding with the remainder of the power-up sequence.
> 
> Fixes: 79cdc56c4a54 ("accel/ivpu: Add initial support for VPU 4")
> Signed-off-by: Karol Wachowski <karol.wachowski 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>

Reviewed-by: Jeffrey Hugo <quic_jhugo at quicinc.com>