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OMAP3: PM debug: allow runtime toggle of PM features

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Allow enable/disable of low-power states during idle.  To
enable low-power idle:

   echo 1 > /debug/pm_debug/sleep_while_idle

 to disable:

   echo 0 > /debug/pm_debug/sleep_while_idle

Also allow enable/disable of OFF-mode.  To enable:

   echo 1 > /debug/pm_debug/enable_off_mode

 to disable:

   echo 0 > /debug/pm_debug/enable_off_mode

Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Kevin Hilman 2009-10-06 14:25:09 -07:00
parent 89139dce8a
commit c40552bc82
4 changed files with 53 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
arch/arm/mach-omap2/pm-debug.c
View File

@ -527,6 +527,29 @@ static int __init pwrdms_setup(struct powerdomain *pwrdm, void *dir)
return 0;
}
static int option_get(void *data, u64 *val)
{
u32 *option = data;
*val = *option;
return 0;
}
static int option_set(void *data, u64 val)
{
u32 *option = data;
*option = val;
if (option == &enable_off_mode)
omap3_pm_off_mode_enable(val);
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(pm_dbg_option_fops, option_get, option_set, "%llu\n");
static int __init pm_dbg_init(void)
{
int i;
@ -569,6 +592,10 @@ static int __init pm_dbg_init(void)
}
(void) debugfs_create_file("enable_off_mode", S_IRUGO | S_IWUGO, d,
&enable_off_mode, &pm_dbg_option_fops);
(void) debugfs_create_file("sleep_while_idle", S_IRUGO | S_IWUGO, d,
&sleep_while_idle, &pm_dbg_option_fops);
pm_dbg_init_done = 1;
return 0;

4
arch/arm/mach-omap2/pm.h
View File

@ -13,7 +13,11 @@
#include <plat/powerdomain.h>
extern u32 enable_off_mode;
extern u32 sleep_while_idle;
extern void *omap3_secure_ram_storage;
extern void omap3_pm_off_mode_enable(int);
extern int omap3_pm_get_suspend_state(struct powerdomain *pwrdm);
extern int omap3_pm_set_suspend_state(struct powerdomain *pwrdm, int state);

22
arch/arm/mach-omap2/pm34xx.c
View File

@ -25,6 +25,7 @@
#include <linux/list.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <plat/sram.h>
#include <plat/clockdomain.h>
@ -57,6 +58,9 @@
#define OMAP343X_TABLE_VALUE_OFFSET 0x30
#define OMAP343X_CONTROL_REG_VALUE_OFFSET 0x32
u32 enable_off_mode;
u32 sleep_while_idle;
struct power_state {
struct powerdomain *pwrdm;
u32 next_state;
@ -456,6 +460,8 @@ static int omap3_fclks_active(void)
static int omap3_can_sleep(void)
{
if (!sleep_while_idle)
return 0;
if (!omap_uart_can_sleep())
return 0;
if (omap3_fclks_active())
@ -900,6 +906,22 @@ static void __init prcm_setup_regs(void)
omap3_d2d_idle();
}
void omap3_pm_off_mode_enable(int enable)
{
struct power_state *pwrst;
u32 state;
if (enable)
state = PWRDM_POWER_OFF;
else
state = PWRDM_POWER_RET;
list_for_each_entry(pwrst, &pwrst_list, node) {
pwrst->next_state = state;
set_pwrdm_state(pwrst->pwrdm, state);
}
}
int omap3_pm_get_suspend_state(struct powerdomain *pwrdm)
{
struct power_state *pwrst;

2
arch/arm/mach-omap2/serial.c
View File

@ -155,8 +155,6 @@ static inline void __init omap_uart_reset(struct omap_uart_state *uart)
#if defined(CONFIG_PM) && defined(CONFIG_ARCH_OMAP3)
static int enable_off_mode; /* to be removed by full off-mode patches */
static void omap_uart_save_context(struct omap_uart_state *uart)
{
u16 lcr = 0;