Tegra: PMC: lock SCRATCH22 register
The PMC Scratch22 register contains the CPU reset vector to
be used by the warmboot code to power up the CPU while resuming
from system suspend. This patch locks this PMC register to avoid
any further writes.
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 6e7f23c..d48b575 100644
--- a/plat/nvidia/tegra/common/drivers/pmc/pmc.c
+++ b/plat/nvidia/tegra/common/drivers/pmc/pmc.c
@@ -105,6 +105,11 @@
{
uint32_t val;
+ /* lock PMC_SECURE_SCRATCH22 */
+ val = tegra_pmc_read_32(PMC_SECURE_DISABLE2);
+ val |= PMC_SECURE_DISABLE2_WRITE22_ON;
+ tegra_pmc_write_32(PMC_SECURE_DISABLE2, val);
+
/* lock PMC_SECURE_SCRATCH34/35 */
val = tegra_pmc_read_32(PMC_SECURE_DISABLE3);
val |= (PMC_SECURE_DISABLE3_WRITE34_ON |