From cc1b6028878646a2419b27e5f590b5e9fe01dc3d Mon Sep 17 00:00:00 2001 From: Eduardo Valentin Date: Mon, 20 Dec 2010 14:05:09 -0600 Subject: [PATCH] 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 [nm@ti.com: rebased the code to 2.6.37-rc2- short circuit code changed a bit] Signed-off-by: Nishanth Menon Signed-off-by: Eduardo Valentin Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/cpuidle34xx.c | 12 ++++++++++++ arch/arm/mach-omap2/pm.h | 1 + arch/arm/mach-omap2/pm34xx.c | 25 ++++++++++++++++++++++--- 3 files changed, 35 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-omap2/cpuidle34xx.c b/arch/arm/mach-omap2/cpuidle34xx.c index f290e484e576..0fb619c52588 100644 --- a/arch/arm/mach-omap2/cpuidle34xx.c +++ b/arch/arm/mach-omap2/cpuidle34xx.c @@ -453,6 +453,18 @@ void omap_init_power_states(void) 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 29663cc01a59..b4e66f9e1945 100644 --- a/arch/arm/mach-omap2/pm.h +++ b/arch/arm/mach-omap2/pm.h @@ -86,6 +86,7 @@ extern unsigned int omap24xx_cpu_suspend_sz; 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 74bc15e71e9f..a81ed251e667 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -917,12 +917,29 @@ void omap3_pm_off_mode_enable(int enable) 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 @@ static void __init pm_errata_configure(void) 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; } }