Bluetooth: Controller: nRF54Lx: Flash sync restrict to one iteration

Write operations are not constant time on nRF54Lx SoCs and
depend on the previous value present versus new value to be
written. Hence, perform no more than one iteration.

Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: cvinayak

subsys/bluetooth/controller/flash/soc_flash_nrf_ticker.c

@@ -250,14 +250,24 @@ void nrf_flash_sync_get_timestamp_begin(void)
 
 bool nrf_flash_sync_check_time_limit(uint32_t iteration)
 {
-	uint32_t ticks_diff;
+	if (IS_ENABLED(CONFIG_SOC_COMPATIBLE_NRF54LX)) {
+		/* Write operations are not constant time depending on the previous value present
+		 * versus new value to be written. Hence, perform no more than one iteration.
+		 */
+
+		ARG_UNUSED(iteration);
 
-	ticks_diff = ticker_ticks_diff_get(ticker_ticks_now_get(),
-					   _ticker_sync_context.ticks_begin);
-	if (ticks_diff + ticks_diff/iteration >
-	    HAL_TICKER_US_TO_TICKS(_ticker_sync_context.slot)) {
 		return true;
-	}
+	} else {
+		uint32_t ticks_diff;
 
-	return false;
+		ticks_diff = ticker_ticks_diff_get(ticker_ticks_now_get(),
+						   _ticker_sync_context.ticks_begin);
+		if (ticks_diff + ticks_diff/iteration >
+		    HAL_TICKER_US_TO_TICKS(_ticker_sync_context.slot)) {
+			return true;
+		}
+
+		return false;
+	}
 }