Tegra: PMC: check if a CPU is already online
This patch checks if the target CPU is already online before
proceeding with it's power ON sequence.
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/common/drivers/pmc/pmc.c b/plat/nvidia/tegra/common/drivers/pmc/pmc.c
index 5796ac7..6e7f23c 100644
--- a/plat/nvidia/tegra/common/drivers/pmc/pmc.c
+++ b/plat/nvidia/tegra/common/drivers/pmc/pmc.c
@@ -52,6 +52,13 @@
uint32_t val;
/*
+ * Check if CPU is already power ungated
+ */
+ val = tegra_pmc_read_32(PMC_PWRGATE_STATUS);
+ if (val & (1 << pmc_cpu_powergate_id[cpu]))
+ return;
+
+ /*
* The PMC deasserts the START bit when it starts the power
* ungate process. Loop till no power toggle is in progress.
*/
