From 32e308dd796f34f85d1c088e3218fa3403a9080f Mon Sep 17 00:00:00 2001
From: "Ang, Chee Hong" <chee.hong.ang@intel.com>
Date: Fri, 3 May 2019 01:18:27 -0700
Subject: [PATCH] ARM: socfpga: stratix10: Probe FPGA status before bridge
 enable

Send CONFIG_STATUS and RECONFIG_STATUS mailbox commands to Secure
Device Manager (SDM) to get the status of FPGA and make sure the
FPGA is in user mode before enable the bridge.

Signed-off-by: Ang, Chee Hong <chee.hong.ang@intel.com>
---
 arch/arm/mach-socfpga/misc_s10.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm/mach-socfpga/misc_s10.c b/arch/arm/mach-socfpga/misc_s10.c
index 60c9609..29abc4a 100644
--- a/arch/arm/mach-socfpga/misc_s10.c
+++ b/arch/arm/mach-socfpga/misc_s10.c
@@ -16,6 +16,7 @@
 #include <asm/arch/misc.h>
 #include <asm/pl310.h>
 #include <linux/libfdt.h>
+#include <asm/arch/mailbox_s10.h>
 
 #include <dt-bindings/reset/altr,rst-mgr-s10.h>
 
@@ -152,5 +153,16 @@ int arch_early_init_r(void)
 
 void do_bridge_reset(int enable, unsigned int mask)
 {
+	/* Check FPGA status before bridge enable */
+	if (enable) {
+		int ret = mbox_get_fpga_config_status(MBOX_RECONFIG_STATUS);
+
+		if (ret && ret != MBOX_CFGSTAT_STATE_CONFIG)
+			ret = mbox_get_fpga_config_status(MBOX_CONFIG_STATUS);
+
+		if (ret)
+			return;
+	}
+
 	socfpga_bridges_reset(enable);
 }
-- 
2.7.4