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Tegra186: fix programming sequence for SC7/SC8 entry 

This patch fixes the programming sequence for 'System Suspend' and
'Quasi power down' state entry. The device needs to update the
required power state before querying the MCE firmware to see the
entry to that power state is allowed.

Original change by Allen Yu <alleny@nvidia.com>

Change-Id: I65e03754322188af913fabf41f29d1c3595afd85
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
This commit is contained in:
Varun Wadekar 2016-03-28 15:11:43 -07:00
parent 1b9ab0542e
commit 50f38a4a53
1 changed files with 15 additions and 15 deletions
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30
plat/nvidia/tegra/soc/t186/plat_psci_handlers.c
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@ -150,14 +150,6 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
} else if (stateid_afflvl2 == PSTATE_ID_SOC_POWERDN) {
/* loop until SC7 is allowed */
do {
val = mce_command_handler(MCE_CMD_IS_SC7_ALLOWED,
TEGRA_ARI_CORE_C7,
MCE_CORE_SLEEP_TIME_INFINITE,
0);
} while (val == 0);
/* save SE registers */
se_regs[0] = mmio_read_32(TEGRA_SE0_BASE +
SE_MUTEX_WATCHDOG_NS_LIMIT);
@ -184,6 +176,14 @@ int tegra_soc_pwr_domain_suspend(const psci_power_state_t *target_state)
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC7, 0, TEGRA_ARI_SYSTEM_SC7);
/* Loop until system suspend is allowed */
do {
val = mce_command_handler(MCE_CMD_IS_SC7_ALLOWED,
TEGRA_ARI_CORE_C7,
MCE_CORE_SLEEP_TIME_INFINITE,
0);
} while (val == 0);
/* Instruct the MCE to enter system suspend state */
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE,
TEGRA_ARI_CORE_C7, MCE_CORE_SLEEP_TIME_INFINITE, 0);
@ -314,6 +314,13 @@ __dead2 void tegra_soc_prepare_system_off(void)
} else if (tegra186_system_powerdn_state == TEGRA_ARI_SYSTEM_SC8) {
/* Prepare for quasi power down */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 1);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC7, 0, TEGRA_ARI_SYSTEM_SC8);
/* loop until other CPUs power down */
do {
val = mce_command_handler(MCE_CMD_IS_SC7_ALLOWED,
@ -322,13 +329,6 @@ __dead2 void tegra_soc_prepare_system_off(void)
0);
} while (val == 0);
/* Prepare for quasi power down */
write_ctx_reg(gp_regs, CTX_GPREG_X4, 1);
write_ctx_reg(gp_regs, CTX_GPREG_X5, 0);
write_ctx_reg(gp_regs, CTX_GPREG_X6, 1);
(void)mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO,
TEGRA_ARI_CLUSTER_CC7, 0, TEGRA_ARI_SYSTEM_SC8);
/* Enter quasi power down state */
(void)mce_command_handler(MCE_CMD_ENTER_CSTATE,
TEGRA_ARI_CORE_C7, MCE_CORE_SLEEP_TIME_INFINITE, 0);