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OMAP3: PM: Enable SDRAM auto-refresh during sleep

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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>
This commit is contained in:
Tero Kristo 2008-10-13 13:17:06 +03:00 committed by Kevin Hilman
parent 9d97140bd0
commit 13a6fe0f6a
1 changed files with 29 additions and 0 deletions
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29
arch/arm/mach-omap2/pm34xx.c
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@ -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;
@ -348,6 +356,21 @@ static void omap_sram_idle(void)
prm_set_mod_reg_bits(OMAP3430_EN_IO, WKUP_MOD, PM_WKEN);
}
/*
* 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
@ -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();