Tegra: sip: add VPR resize enabled check
The Memory Controller provides a control register to check
if the video memory can be resized. The previous bootloader
might have locked this feature, which will be reflected by
this register.
This patch reads the control register before processing
a video memory resize request. An error code, -ENOTSUP,
is returned if the feature is locked.
Change-Id: Ia1d67f7a94aa15c6b18ff5c9b9b952e179596ae3
Signed-off-by: Anthony Zhou <anzhou@nvidia.com>
diff --git a/plat/nvidia/tegra/common/tegra_sip_calls.c b/plat/nvidia/tegra/common/tegra_sip_calls.c
index 1d48cc0..80a2c4d 100644
--- a/plat/nvidia/tegra/common/tegra_sip_calls.c
+++ b/plat/nvidia/tegra/common/tegra_sip_calls.c
@@ -52,6 +52,12 @@
switch (smc_fid) {
case TEGRA_SIP_NEW_VIDEOMEM_REGION:
+ /* Check whether Video memory resize is enabled */
+ if (mmio_read_32(TEGRA_MC_BASE + MC_VIDEO_PROTECT_REG_CTRL)
+ != MC_VIDEO_PROTECT_WRITE_ACCESS_ENABLED) {
+ ERROR("Video Memory Resize isn't enabled! \n");
+ SMC_RET1(handle, (uint64_t)-ENOTSUP);
+ }
/*
* Check if Video Memory overlaps TZDRAM (contains bl31/bl32)