dp: remove deadline recalculation at the start of LL run

Currently DP deadlines are recalculated in the beginning and the end
of each LL scheduling tick. As discussed in
thesofproject#10177 (comment)
recalculating it in the beginning is superfluous. Remove it.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

src/include/sof/lib/notifier.h

@@ -32,7 +32,6 @@ enum notify_id {
 	NOTIFIER_ID_BUFFER_FREE,		/* struct buffer_cb_free* */
 	NOTIFIER_ID_DMA_COPY,			/* struct dma_cb_data* */
 	NOTIFIER_ID_LL_POST_RUN,		/* NULL */
-	NOTIFIER_ID_LL_PRE_RUN,			/* NULL */
 	NOTIFIER_ID_DMA_IRQ,			/* struct dma_chan_data * */
 	NOTIFIER_ID_DAI_TRIGGER,		/* struct dai_group * */
 	NOTIFIER_ID_MIC_PRIVACY_STATE_CHANGE,	/* struct mic_privacy_settings * */

src/schedule/ll_schedule.c

@@ -313,9 +313,6 @@ static void schedule_ll_tasks_run(void *data)
 
 	perf_cnt_init(&sch->pcd);
 
-	notifier_event(sch, NOTIFIER_ID_LL_PRE_RUN,
-		       NOTIFIER_TARGET_CORE_LOCAL, NULL, 0);
-
 	/* run tasks if there are any pending */
 	if (schedule_ll_is_pending(sch))
 		schedule_ll_tasks_execute(sch);

src/schedule/zephyr_dp_schedule.c

@@ -231,9 +231,8 @@ void scheduler_dp_ll_tick(void *receiver_data, enum notify_id event_type, void *
 	unsigned int lock_key;
 	struct scheduler_dp_data *dp_sch = scheduler_get_data(SOF_SCHEDULE_DP);
 
-	if (event_type == NOTIFIER_ID_LL_PRE_RUN)
-		/* remember current timestamp as "NOW" */
-		dp_sch->last_ll_tick_timestamp = k_cycle_get_32();
+	/* remember current timestamp as "NOW" */
+	dp_sch->last_ll_tick_timestamp = k_cycle_get_32();
 
 	lock_key = scheduler_dp_lock(cpu_get_id());
 	scheduler_dp_recalculate(dp_sch, event_type == NOTIFIER_ID_LL_POST_RUN);
@@ -363,7 +362,6 @@ int scheduler_dp_init(void)
 	if (ret)
 		return ret;
 
-	notifier_register(NULL, NULL, NOTIFIER_ID_LL_PRE_RUN, scheduler_dp_ll_tick, 0);
 	notifier_register(NULL, NULL, NOTIFIER_ID_LL_POST_RUN, scheduler_dp_ll_tick, 0);
 
 	return 0;

src/schedule/zephyr_ll.c

@@ -176,9 +176,6 @@ static void zephyr_ll_run(void *data)
 	struct list_item *list, *tmp, task_head = LIST_INIT(task_head);
 	uint32_t flags;
 
-	notifier_event(sch, NOTIFIER_ID_LL_PRE_RUN,
-		       NOTIFIER_TARGET_CORE_LOCAL, NULL, 0);
-
 	zephyr_ll_lock(sch, &flags);
 
 	/*