zynqmp: pm: Filter errors related to clock gate permissions

Linux clock framework cannot properly deal with these errors. When the
error is related to the lack of permissions to control the clock we
filter the error and report the success to linux. Before recent changes
in clock framework across the stack, this was done in the PMU-FW as a
workaround. Since the PMU-FW now handles clocks and the permissions to
control them using general principles rather than workarounds, it can
no longer distinguish such exceptions and it has to return no-access
error.
Signed-off-by: Mirela Simonovic <mirela.simonovic@aggios.com>
Acked-by: Will Wong <WILLW@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Change-Id: I1491a80e472f44e322a542b29a20eb1cb3319802

plat/xilinx/zynqmp/pm_service/pm_api_sys.c

@@ -907,7 +907,13 @@ static enum pm_ret_status pm_clock_gate(unsigned int clock_id,
 
 	/* Send request to the PMU */
 	PM_PACK_PAYLOAD2(payload, api_id, clock_id);
-	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
+	status = pm_ipi_send_sync(primary_proc, payload, NULL, 0);
+
+	/* If action fails due to the lack of permissions filter the error */
+	if (status == PM_RET_ERROR_ACCESS)
+		status = PM_RET_SUCCESS;
+
+	return status;
 }
 
 /**