On Wed, 3 Jul 2024 16:56:46 +0100
Steven Price <steven.price@xxxxxxx> wrote:
> If a queue is already assigned to the hardware, then a newly submitted
> job can start straight away without waiting for the tick. However in
> this case the devfreq infrastructure isn't notified that the GPU is
> busy. By the time the tick happens the job might well have finished and
> no time will be accounted for the GPU being busy.
>
> Fix this by recording the GPU as busy directly in queue_run_job() in the
> case where there is a CSG assigned and therefore we just ring the
> doorbell.
>
> Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block")
> Signed-off-by: Steven Price <steven.price@xxxxxxx>
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panthor/panthor_sched.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 951ff7e63ea8..e7afaa1ad8dc 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -2942,6 +2942,7 @@ queue_run_job(struct drm_sched_job *sched_job)
> pm_runtime_get(ptdev->base.dev);
> sched->pm.has_ref = true;
> }
> + panthor_devfreq_record_busy(sched->ptdev);
> }
>
> /* Update the last fence. */
