Tegra210: deassert CPU reset signals during power on
This patch de-asserts the CPU reset signals for each CPU as
part of it's power on sequence. This is needed to get rid of
the wait in BPMP firmware during SC7 exit.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/soc/t210/plat_psci_handlers.c b/plat/nvidia/tegra/soc/t210/plat_psci_handlers.c
index f594d20..010899a 100644
--- a/plat/nvidia/tegra/soc/t210/plat_psci_handlers.c
+++ b/plat/nvidia/tegra/soc/t210/plat_psci_handlers.c
@@ -40,6 +40,13 @@
#include <tegra_def.h>
#include <tegra_private.h>
+/*
+ * Register used to clear CPU reset signals. Each CPU has two reset
+ * signals: CPU reset (3:0) and Core reset (19:16).
+ */
+#define CPU_CMPLX_RESET_CLR 0x454
+#define CPU_CORE_RESET_MASK 0x10001
+
static int cpu_powergate_mask[PLATFORM_MAX_CPUS_PER_CLUSTER];
int tegra_prepare_cpu_suspend(unsigned int id, unsigned int afflvl)
@@ -116,6 +123,10 @@
int tegra_prepare_cpu_on(unsigned long mpidr)
{
int cpu = mpidr & MPIDR_CPU_MASK;
+ uint32_t mask = CPU_CORE_RESET_MASK << cpu;
+
+ /* Deassert CPU reset signals */
+ mmio_write_32(TEGRA_CAR_RESET_BASE + CPU_CMPLX_RESET_CLR, mask);
/* Turn on CPU using flow controller or PMC */
if (cpu_powergate_mask[cpu] == 0) {
