diff options
| author | Tero Kristo <tero.kristo@nokia.com> | 2008-10-13 13:17:06 +0300 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2009-11-11 14:42:25 -0800 |
| commit | 13a6fe0f6adf62bf73be055322197507761d160a (patch) | |
| tree | ee29ff33f79750c4caf6b4210a50fd4c09b612f7 /arch | |
| parent | 9d97140bd0c5da55f174a81dafd2bbef135f5748 (diff) | |
OMAP3: PM: Enable SDRAM auto-refresh during sleep
Fix for ES3.0 bug: SDRC not sending auto-refresh when OMAP wakes-up
from OFF mode (warning for HS devices.)
Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-omap2/pm34xx.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index 310c189efb5..3f1f656348f 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -44,6 +44,13 @@ #include "prm.h" #include "pm.h" +#include "sdrc.h" + +#define SDRC_POWER_AUTOCOUNT_SHIFT 8 +#define SDRC_POWER_AUTOCOUNT_MASK (0xffff << SDRC_POWER_AUTOCOUNT_SHIFT) +#define SDRC_POWER_CLKCTRL_SHIFT 4 +#define SDRC_POWER_CLKCTRL_MASK (0x3 << SDRC_POWER_CLKCTRL_SHIFT) +#define SDRC_SELF_REFRESH_ON_AUTOCOUNT (0x2 << SDRC_POWER_CLKCTRL_SHIFT) /* Scratchpad offsets */ #define OMAP343X_TABLE_ADDRESS_OFFSET 0x31 @@ -297,6 +304,7 @@ static void omap_sram_idle(void) int per_next_state = PWRDM_POWER_ON; int core_next_state = PWRDM_POWER_ON; int core_prev_state, per_prev_state; + u32 sdrc_pwr = 0; if (!_omap_sram_idle) return; @@ -349,6 +357,21 @@ static void omap_sram_idle(void) } /* + * Force SDRAM controller to self-refresh mode after timeout on + * autocount. This is needed on ES3.0 to avoid SDRAM controller + * hang-ups. + */ + if (omap_rev() >= OMAP3430_REV_ES3_0 && + omap_type() != OMAP2_DEVICE_TYPE_GP && + core_next_state == PWRDM_POWER_OFF) { + sdrc_pwr = sdrc_read_reg(SDRC_POWER); + sdrc_write_reg((sdrc_pwr & + ~(SDRC_POWER_AUTOCOUNT_MASK|SDRC_POWER_CLKCTRL_MASK)) | + (1 << SDRC_POWER_AUTOCOUNT_SHIFT) | + SDRC_SELF_REFRESH_ON_AUTOCOUNT, SDRC_POWER); + } + + /* * omap3_arm_context is the location where ARM registers * get saved. The restore path then reads from this * location and restores them back. @@ -356,6 +379,12 @@ static void omap_sram_idle(void) _omap_sram_idle(omap3_arm_context, save_state); cpu_init(); + /* Restore normal SDRAM settings */ + if (omap_rev() >= OMAP3430_REV_ES3_0 && + omap_type() != OMAP2_DEVICE_TYPE_GP && + core_next_state == PWRDM_POWER_OFF) + sdrc_write_reg(sdrc_pwr, SDRC_POWER); + /* Restore table entry modified during MMU restoration */ if (pwrdm_read_prev_pwrst(mpu_pwrdm) == PWRDM_POWER_OFF) restore_table_entry(); |