diff options
| author | Akshay Adiga <akshay.adiga@linux.vnet.ibm.com> | 2018-01-04 16:58:03 +0530 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2018-01-14 21:05:51 -0600 |
| commit | a523298bc1e34466bfc4477e4d9aa4352703298a (patch) | |
| tree | 35f813d5ebb4f099f99e62959c5edc1ea78b943d /hw/slw.c | |
| parent | 35c66b8ce5a27ad3312806e8bde9148a5e5b5df8 (diff) | |
| download | skiboot-a523298bc1e34466bfc4477e4d9aa4352703298a.zip skiboot-a523298bc1e34466bfc4477e4d9aa4352703298a.tar.gz skiboot-a523298bc1e34466bfc4477e4d9aa4352703298a.tar.bz2 | |
SLW: Detect if deep states are enabled
Patch adds a global variable which indicates if the deep states are enabled
through stop-enabled-bits. Only applies to POWER9.
Signed-off-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'hw/slw.c')
| -rw-r--r-- | hw/slw.c | 16 |
1 files changed, 15 insertions, 1 deletions
@@ -41,6 +41,7 @@ static uint32_t slw_saved_reset[MAX_RESET_PATCH_SIZE]; static bool slw_current_le = false; enum wakeup_engine_states wakeup_engine_state = WAKEUP_ENGINE_NOT_PRESENT; +bool has_deep_states = false; /* SLW timer related stuff */ static bool slw_has_timer; @@ -908,8 +909,21 @@ void add_cpu_idle_state_properties(void) has_stop_inst = true; stop_levels = dt_prop_get_u32_def(power_mgt, "ibm,enabled-stop-levels", 0); - if (!stop_levels) + if (!stop_levels) { prerror("SLW: No stop levels available. Power saving is disabled!\n"); + has_deep_states = false; + } else { + /* Iterate to see if we have deep states enabled */ + for (i = 0; i < nr_states; i++) { + u32 level = 31 - (states[i].pm_ctrl_reg_val & + OPAL_PM_PSSCR_RL_MASK); + + if ((stop_levels & (1ul << level)) && + (states[i].flags & OPAL_PM_STOP_INST_DEEP)) + has_deep_states = true; + } + } + } else if (chip->type == PROC_CHIP_P8_MURANO || chip->type == PROC_CHIP_P8_VENICE || chip->type == PROC_CHIP_P8_NAPLES) { |