ipc4: fix logging backend initialization

This patch addresses an issue with the logging backend initialization in
the ipc4/logging.c file. The previous implementation used
log_backend_activate, which does not fully enable the backend for log
collection. This was initially masked by the fact that backends are
currently autostarted, but disabling backend autostart would reveal that
logs are not being collected as expected. By switching to
log_backend_enable, the backend is correctly initialized, ensuring logs
are collected reliably.

The use of CONFIG_SOF_LOG_LEVEL as a parameter does not impact runtime
filtering, as it is not enabled, but it aligns with the current logging
configuration practices.

This update fixes the logging backend initialization issue, ensuring
reliable log collection within the SOF firmware, and prepares the system
for scenarios where backend autostart might be disabled, thereby
addressing a hidden problem in the logging setup.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

Author: tmleman

src/ipc/ipc4/logging.c

@@ -16,8 +16,8 @@
 #include <ipc4/logging.h>
 #include <rtos/kernel.h>
 #if !CONFIG_LIBRARY
-#include <zephyr/logging/log_backend.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/logging/log_ctrl.h>
 #endif
 #if CONFIG_LOG_BACKEND_SOF_PROBE
 #include <sof/probe/probe.h>
@@ -144,7 +144,7 @@ int ipc4_logging_enable_logs(bool first_block,
 		k_mutex_init(&log_mutex);
 		k_work_init_delayable(&log_work, log_work_handler);
 
-		log_backend_activate(log_backend, mtrace_log_hook);
+		log_backend_enable(log_backend, mtrace_log_hook, CONFIG_SOF_LOG_LEVEL);
 
 		mtrace_aging_timer = log_state->aging_timer_period;
 		if (mtrace_aging_timer < IPC4_MTRACE_AGING_TIMER_MIN_MS) {
@@ -155,7 +155,7 @@ int ipc4_logging_enable_logs(bool first_block,
 	} else  {
 		k_work_flush_delayable(&log_work, &ipc4_log_work_sync);
 		adsp_mtrace_log_init(NULL);
-		log_backend_deactivate(log_backend);
+		log_backend_disable(log_backend);
 	}
 
 	return 0;
@@ -189,10 +189,10 @@ int ipc4_logging_enable_logs(bool first_block,
 		if (!probe_is_backend_configured())
 			return -EINVAL;
 
-		log_backend_activate(log_backend, NULL);
+		log_backend_enable(log_backend, NULL, CONFIG_SOF_LOG_LEVEL);
 
 	} else  {
-		log_backend_deactivate(log_backend);
+		log_backend_disable(log_backend);
 	}
 
 	return 0;