OMAP3630: PM: Erratum i583: disable coreoff if < ES1.2
Limitation i583: Self_Refresh Exit issue after OFF mode
Issue:
When device is waking up from OFF mode, then SDRC state machine sends
inappropriate sequence violating JEDEC standards.
Impact:
OMAP3630 < ES1.2 is impacted as follows depending on the platform:
CS0: for 38.4MHz as internal sysclk, DDR content seen to be stable, while
for all other sysclk frequencies, varied levels of instability
seen based on varied parameters.
CS1: impacted
This patch takes option #3 as recommended by the Silicon erratum:
Avoid core power domain transitioning to OFF mode. Power consumption
impact is expected in this case.
To do this, we route core OFF requests to RET request on the impacted
revisions of silicon.
Acked-by: Jean Pihet <j-pihet@ti.com>
[nm@ti.com: rebased the code to 2.6.37-rc2- short circuit code changed a bit]
Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c
index f290e48..0fb619c 100644
--- a/arch/arm/mach-omap2/cpuidle34xx.c
+++ b/arch/arm/mach-omap2/cpuidle34xx.c
@@ -453,6 +453,18 @@
omap3_power_states[OMAP3_STATE_C7].core_state = PWRDM_POWER_OFF;
omap3_power_states[OMAP3_STATE_C7].flags = CPUIDLE_FLAG_TIME_VALID |
CPUIDLE_FLAG_CHECK_BM;
+
+ /*
+ * Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot
+ * enable OFF mode in a stable form for previous revisions.
+ * we disable C7 state as a result.
+ */
+ if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583)) {
+ omap3_power_states[OMAP3_STATE_C7].valid = 0;
+ cpuidle_params_table[OMAP3_STATE_C7].valid = 0;
+ WARN_ONCE(1, "%s: core off state C7 disabled due to i583\n",
+ __func__);
+ }
}
struct cpuidle_driver omap3_idle_driver = {
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 29663cc0..b4e66f9 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -86,6 +86,7 @@
extern unsigned int omap34xx_cpu_suspend_sz;
#define PM_RTA_ERRATUM_i608 (1 << 0)
+#define PM_SDRC_WAKEUP_ERRATUM_i583 (1 << 1)
#if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3)
extern u16 pm34xx_errata;
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 74bc15e..a81ed25 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -917,12 +917,29 @@
state = PWRDM_POWER_RET;
#ifdef CONFIG_CPU_IDLE
- omap3_cpuidle_update_states(state, state);
+ /*
+ * Erratum i583: implementation for ES rev < Es1.2 on 3630. We cannot
+ * enable OFF mode in a stable form for previous revisions, restrict
+ * instead to RET
+ */
+ if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583))
+ omap3_cpuidle_update_states(state, PWRDM_POWER_RET);
+ else
+ omap3_cpuidle_update_states(state, state);
#endif
list_for_each_entry(pwrst, &pwrst_list, node) {
- pwrst->next_state = state;
- omap_set_pwrdm_state(pwrst->pwrdm, state);
+ if (IS_PM34XX_ERRATUM(PM_SDRC_WAKEUP_ERRATUM_i583) &&
+ pwrst->pwrdm == core_pwrdm &&
+ state == PWRDM_POWER_OFF) {
+ pwrst->next_state = PWRDM_POWER_RET;
+ WARN_ONCE(1,
+ "%s: Core OFF disabled due to errata i583\n",
+ __func__);
+ } else {
+ pwrst->next_state = state;
+ }
+ omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
}
}
@@ -1000,6 +1017,8 @@
pm34xx_errata |= PM_RTA_ERRATUM_i608;
/* Enable the l2 cache toggling in sleep logic */
enable_omap3630_toggle_l2_on_restore();
+ if (omap_rev() < OMAP3630_REV_ES1_2)
+ pm34xx_errata |= PM_SDRC_WAKEUP_ERRATUM_i583;
}
}