Tegra186: memctrl_v2: restore video memory settings

The memory controller loses its settings when the device enters system
suspend state.

This patch adds a handler to restore the Video Memory settings in the
memory controller, which would be called after exiting the system suspend
state.

Change-Id: I1ac12426d7290ac1452983d3c9e05fabbf3327fa
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

plat/nvidia/tegra/common/drivers/memctrl/memctrl_v2.c

@@ -35,6 +35,7 @@
 #include <memctrl.h>
 #include <memctrl_v2.h>
 #include <mmio.h>
+#include <smmu.h>
 #include <string.h>
 #include <tegra_def.h>
 #include <xlat_tables.h>
@@ -234,7 +235,7 @@ const static mc_txn_override_cfg_t mc_override_cfgs[] = {
 };
 
 /*
- * Init SMMU.
+ * Init Memory controller during boot.
  */
 void tegra_memctrl_setup(void)
 {
@@ -248,9 +249,7 @@ void tegra_memctrl_setup(void)
 	INFO("Tegra Memory Controller (v2)\n");
 
 	/* Program the SMMU pagesize */
-	val = tegra_smmu_read_32(ARM_SMMU_GSR0_SECURE_ACR);
-	val |= ARM_SMMU_GSR0_PGSIZE_64K;
-	tegra_smmu_write_32(ARM_SMMU_GSR0_SECURE_ACR, val);
+	tegra_smmu_init();
 
 	/* Program all the Stream ID overrides */
 	for (i = 0; i < num_overrides; i++)
@@ -316,7 +315,13 @@ void tegra_memctrl_setup(void)
 		}
 
 	}
+}
 
+/*
+ * Restore Memory Controller settings after "System Suspend"
+ */
+void tegra_memctrl_restore_settings(void)
+{
 	/* video memory carveout region */
 	if (video_mem_base) {
 		tegra_mc_write_32(MC_VIDEO_PROTECT_BASE_LO,

plat/nvidia/tegra/include/drivers/memctrl_v2.h

@@ -308,14 +308,6 @@ typedef struct mc_txn_override_cfg {
 		.cgid_tag = MC_TXN_OVERRIDE_ ## val \
 	}
 
-/*******************************************************************************
- * Memory Controller SMMU Global Secure Aux. Configuration Register
- ******************************************************************************/
-#define ARM_SMMU_GSR0_SECURE_ACR		0x10
-#define ARM_SMMU_GSR0_PGSIZE_SHIFT		16
-#define ARM_SMMU_GSR0_PGSIZE_4K			(0 << ARM_SMMU_GSR0_PGSIZE_SHIFT)
-#define ARM_SMMU_GSR0_PGSIZE_64K		(1 << ARM_SMMU_GSR0_PGSIZE_SHIFT)
-
 /*******************************************************************************
  * Structure to hold the Stream ID to use to override client inputs
  ******************************************************************************/
@@ -396,14 +388,4 @@ static inline void tegra_mc_streamid_write_32(uint32_t off, uint32_t val)
 	mmio_write_32(TEGRA_MC_STREAMID_BASE + off, val);
 }
 
-static inline uint32_t tegra_smmu_read_32(uint32_t off)
-{
-	return mmio_read_32(TEGRA_SMMU_BASE + off);
-}
-
-static inline void tegra_smmu_write_32(uint32_t off, uint32_t val)
-{
-	mmio_write_32(TEGRA_SMMU_BASE + off, val);
-}
-
 #endif /* __MEMCTRLV2_H__ */