[U-Boot] [PATCH][v3] driver: net: fsl-mc: Memset MC reserve ram memory before usage

[Prabhakar Kushwaha]

It is required to clean Management Complex reserve memory before any
usage.
So memset MC reserve memory.

Signed-off-by: Prabhakar Kushwaha <prabhakar.kushwaha at nxp.com>
---
Changes for v2: 
	- updated patch subject
	- Consider case of dpl apply and mc_boot failure 
Changes for v3
	- updated mc_boot failure case for more clarity


 drivers/net/fsl-mc/mc.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/fsl-mc/mc.c b/drivers/net/fsl-mc/mc.c
index 940025a467..12f6d8f6e4 100644
--- a/drivers/net/fsl-mc/mc.c
+++ b/drivers/net/fsl-mc/mc.c
@@ -2,6 +2,7 @@
 /*
  * Copyright 2014 Freescale Semiconductor, Inc.
  * Copyright 2017 NXP
+ * Copyright 2017-2018 NXP
  */
 #include <common.h>
 #include <errno.h>
@@ -29,6 +30,7 @@
 #define MC_BOOT_ENV_VAR		"mcinitcmd"
 
 DECLARE_GLOBAL_DATA_PTR;
+static int mc_memset_resv_ram;
 static int mc_boot_status = -1;
 static int mc_dpl_applied = -1;
 #ifdef CONFIG_SYS_LS_MC_DRAM_AIOP_IMG_OFFSET
@@ -810,6 +812,11 @@ u64 mc_get_dram_addr(void)
 {
 	size_t mc_ram_size = mc_get_dram_block_size();
 
+	if (!mc_memset_resv_ram || (get_mc_boot_status() < 0)) {
+		mc_memset_resv_ram = 1;
+		memset((void *)gd->arch.resv_ram, 0, mc_ram_size);
+	}
+
 	return (gd->arch.resv_ram + mc_ram_size - 1) &
 		MC_RAM_BASE_ADDR_ALIGNMENT_MASK;
 }
-- 
2.14.1