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ARM: OMAP3xxx: CPUIdle: simplify the PER next-state code 

The OMAP3xxx CPUIdle driver contains some code to place a lower bound
on the PER powerdomain's power state.  Convert this code to a data-driven
implementation to remove branches and to improve readability.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
This commit is contained in:
Paul Walmsley 2013-01-26 00:58:12 -07:00
parent 8e1ff676ef
commit fd6b42a561
1 changed files with 22 additions and 22 deletions
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44
arch/arm/mach-omap2/cpuidle34xx.c
View File

@ -36,40 +36,53 @@
/* Mach specific information to be recorded in the C-state driver_data */
struct omap3_idle_statedata {
u32 mpu_state;
u32 core_state;
u8 mpu_state;
u8 core_state;
u8 per_min_state;
};
static struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd;
/*
* Prevent PER OFF if CORE is not in RETention or OFF as this would
* disable PER wakeups completely.
*/
static struct omap3_idle_statedata omap3_idle_data[] = {
{
.mpu_state = PWRDM_POWER_ON,
.core_state = PWRDM_POWER_ON,
/* In C1 do not allow PER state lower than CORE state */
.per_min_state = PWRDM_POWER_ON,
},
{
.mpu_state = PWRDM_POWER_ON,
.core_state = PWRDM_POWER_ON,
.per_min_state = PWRDM_POWER_RET,
},
{
.mpu_state = PWRDM_POWER_RET,
.core_state = PWRDM_POWER_ON,
.per_min_state = PWRDM_POWER_RET,
},
{
.mpu_state = PWRDM_POWER_OFF,
.core_state = PWRDM_POWER_ON,
.per_min_state = PWRDM_POWER_RET,
},
{
.mpu_state = PWRDM_POWER_RET,
.core_state = PWRDM_POWER_RET,
.per_min_state = PWRDM_POWER_OFF,
},
{
.mpu_state = PWRDM_POWER_OFF,
.core_state = PWRDM_POWER_RET,
.per_min_state = PWRDM_POWER_OFF,
},
{
.mpu_state = PWRDM_POWER_OFF,
.core_state = PWRDM_POWER_OFF,
.per_min_state = PWRDM_POWER_OFF,
},
};
@ -209,10 +222,9 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
struct cpuidle_driver *drv,
int index)
{
int new_state_idx;
u32 core_next_state, per_next_state = 0, per_saved_state = 0;
int new_state_idx, ret;
u8 per_next_state, per_saved_state;
struct omap3_idle_statedata *cx;
int ret;
/*
* Use only C1 if CAM is active.
@ -233,25 +245,13 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
/* Program PER state */
cx = &omap3_idle_data[new_state_idx];
core_next_state = cx->core_state;
per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd);
if (new_state_idx == 0) {
/* In C1 do not allow PER state lower than CORE state */
if (per_next_state < core_next_state)
per_next_state = core_next_state;
} else {
/*
* Prevent PER OFF if CORE is not in RETention or OFF as this
* would disable PER wakeups completely.
*/
if ((per_next_state == PWRDM_POWER_OFF) &&
(core_next_state > PWRDM_POWER_RET))
per_next_state = PWRDM_POWER_RET;
}
/* Are we changing PER target state? */
if (per_next_state != per_saved_state)
per_next_state = pwrdm_read_next_pwrst(per_pd);
per_saved_state = per_next_state;
if (per_next_state < cx->per_min_state) {
per_next_state = cx->per_min_state;
pwrdm_set_next_pwrst(per_pd, per_next_state);
}
ret = omap3_enter_idle(dev, drv, new_state_idx);