imx: power optimization for i.mx8qm
Current implementation of i.MX8QM power management related
features does NOT optimize power number, all system resources
like CCI, DDR, and A cluster etc. are kept in STBY mode (powered
ON) when system suspend or CPU hotplug.
To lower the power number, OFF mode should be adopted for those
system resources whenever they can be OFF, A cluster will be OFF
if the CPUs in the cluster are all off line, DDR/MU/DB can be OFF
if system suspend, IRQ steer can be OFF if the wakeup source is
belonged to system controller partition, so wakeup source runtime
check is used to determine if IRQ steer can be OFF before system
suspend.
If resources are powered off for suspend, they should be restored
properly after system resume.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
diff --git a/plat/imx/common/plat_imx8_gic.c b/plat/imx/common/plat_imx8_gic.c
index aec0b6c..27c525b 100644
--- a/plat/imx/common/plat_imx8_gic.c
+++ b/plat/imx/common/plat_imx8_gic.c
@@ -73,3 +73,19 @@
{
gicv3_rdistif_init(plat_my_core_pos());
}
+
+void plat_gic_save(unsigned int proc_num, struct plat_gic_ctx *ctx)
+{
+ /* save the gic rdist/dist context */
+ for (int i = 0; i < PLATFORM_CORE_COUNT; i++)
+ gicv3_rdistif_save(i, &ctx->rdist_ctx[i]);
+ gicv3_distif_save(&ctx->dist_ctx);
+}
+
+void plat_gic_restore(unsigned int proc_num, struct plat_gic_ctx *ctx)
+{
+ /* restore the gic rdist/dist context */
+ gicv3_distif_init_restore(&ctx->dist_ctx);
+ for (int i = 0; i < PLATFORM_CORE_COUNT; i++)
+ gicv3_rdistif_init_restore(i, &ctx->rdist_ctx[i]);
+}