diff options
| -rw-r--r-- | hw/slw.c | 14 |
1 files changed, 14 insertions, 0 deletions
@@ -637,6 +637,7 @@ void add_cpu_idle_state_properties(void) u64 *pm_ctrl_reg_val_buf; u64 *pm_ctrl_reg_mask_buf; u32 supported_states_mask; + u32 stop_levels; /* Variables to track buffer length */ u8 name_buf_len; @@ -676,6 +677,12 @@ void add_cpu_idle_state_properties(void) states = power9_cpu_idle_states; nr_states = ARRAY_SIZE(power9_cpu_idle_states); has_stop_inst = true; + + stop_levels = dt_prop_get_u32_def(power_mgt, + "ibm,enabled-stop-levels", 0); + if (!stop_levels) + prerror("SLW: No stop levels available. Power saving is disabled!\n"); + } else if (chip->type == PROC_CHIP_P8_MURANO || chip->type == PROC_CHIP_P8_VENICE || chip->type == PROC_CHIP_P8_NAPLES) { @@ -754,6 +761,13 @@ void add_cpu_idle_state_properties(void) if (!(states[i].flags & supported_states_mask)) continue; + /* We can only use the stop levels that HB has made available */ + if (has_stop_inst) { + u32 level = 1ul << states[i].pm_ctrl_reg_val; + if (!(stop_levels & level)) + continue; + } + /* * If a state is supported add each of its property * to its corresponding property buffer. |