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OMAP3: cpuidle: code rework for improved readability

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- fix single and multi-lines comments format
- removed the omap3_idle_bm_check function and replaced the test
   in omap3_enter_idle_bm by the equivalent code
- re-organize omap3_enter_idle_bm code path, assign local variables
   only when needed
- reword some comments

Signed-off-by: Jean Pihet <j-pihet@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Jean Pihet 2011-05-09 12:02:15 +02:00 committed by Kevin Hilman
parent badc303a86
commit c6cd91de1c
1 changed files with 19 additions and 33 deletions
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52
arch/arm/mach-omap2/cpuidle34xx.c
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@ -71,13 +71,6 @@ struct omap3_idle_statedata omap3_idle_data[OMAP3_NUM_STATES];
struct powerdomain *mpu_pd, *core_pd, *per_pd, *cam_pd;
static int omap3_idle_bm_check(void)
{
if (!omap3_can_sleep())
return 1;
return 0;
}
static int _cpuidle_allow_idle(struct powerdomain *pwrdm,
struct clockdomain *clkdm)
{
@ -157,9 +150,7 @@ static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
struct cpuidle_state *curr)
{
struct cpuidle_state *next = NULL;
struct omap3_idle_statedata *cx;
cx = cpuidle_get_statedata(curr);
struct omap3_idle_statedata *cx = cpuidle_get_statedata(curr);
/* Check if current state is valid */
if (cx->valid) {
@ -167,9 +158,7 @@ static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
} else {
int idx = OMAP3_NUM_STATES - 1;
/*
* Reach the current state starting at highest C-state
*/
/* Reach the current state starting at highest C-state */
for (; idx >= 0; idx--) {
if (&dev->states[idx] == curr) {
next = &dev->states[idx];
@ -177,9 +166,7 @@ static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
}
}
/*
* Should never hit this condition.
*/
/* Should never hit this condition */
WARN_ON(next == NULL);
/*
@ -214,29 +201,16 @@ static struct cpuidle_state *next_valid_state(struct cpuidle_device *dev,
static int omap3_enter_idle_bm(struct cpuidle_device *dev,
struct cpuidle_state *state)
{
struct cpuidle_state *new_state = next_valid_state(dev, state);
u32 core_next_state, per_next_state = 0, per_saved_state = 0;
u32 cam_state;
struct cpuidle_state *new_state;
u32 core_next_state, per_next_state = 0, per_saved_state = 0, cam_state;
struct omap3_idle_statedata *cx;
int ret;
if (omap3_idle_bm_check()) {
BUG_ON(!dev->safe_state);
if (!omap3_can_sleep()) {
new_state = dev->safe_state;
goto select_state;
}
cx = cpuidle_get_statedata(state);
core_next_state = cx->core_state;
/*
* FIXME: we currently manage device-specific idle states
* for PER and CORE in combination with CPU-specific
* idle states. This is wrong, and device-specific
* idle management needs to be separated out into
* its own code.
*/
/*
* Prevent idle completely if CAM is active.
* CAM does not have wakeup capability in OMAP3.
@ -247,10 +221,20 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
goto select_state;
}
/*
* FIXME: we currently manage device-specific idle states
* for PER and CORE in combination with CPU-specific
* idle states. This is wrong, and device-specific
* idle management needs to be separated out into
* its own code.
*/
/*
* Prevent PER off if CORE is not in retention or off as this
* would disable PER wakeups completely.
*/
cx = cpuidle_get_statedata(state);
core_next_state = cx->core_state;
per_next_state = per_saved_state = pwrdm_read_next_pwrst(per_pd);
if ((per_next_state == PWRDM_POWER_OFF) &&
(core_next_state > PWRDM_POWER_RET))
@ -260,6 +244,8 @@ static int omap3_enter_idle_bm(struct cpuidle_device *dev,
if (per_next_state != per_saved_state)
pwrdm_set_next_pwrst(per_pd, per_next_state);
new_state = next_valid_state(dev, state);
select_state:
dev->last_state = new_state;
ret = omap3_enter_idle(dev, new_state);
@ -320,7 +306,7 @@ struct cpuidle_driver omap3_idle_driver = {
.owner = THIS_MODULE,
};
/* Fill in the state data from the mach tables and register the driver_data */
/* Helper to fill the C-state common data and register the driver_data */
static inline struct omap3_idle_statedata *_fill_cstate(
struct cpuidle_device *dev,
int idx, const char *descr)