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Diffstat (limited to 'arch/arm/mach-omap2/powerdomain.c')
-rw-r--r--arch/arm/mach-omap2/powerdomain.c79
1 files changed, 78 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index faebd5f076af..7fb033eca0a5 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -546,7 +546,8 @@ int pwrdm_for_each_clkdm(struct powerdomain *pwrdm,
return -EINVAL;
for (i = 0; i < PWRDM_MAX_CLKDMS && !ret; i++)
- ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
+ if (pwrdm->pwrdm_clkdms[i])
+ ret = (*fn)(pwrdm, pwrdm->pwrdm_clkdms[i]);
return ret;
}
@@ -1080,6 +1081,82 @@ int pwrdm_post_transition(struct powerdomain *pwrdm)
}
/**
+ * pwrdm_get_valid_lp_state() - Find best match deep power state
+ * @pwrdm: power domain for which we want to find best match
+ * @is_logic_state: Are we looking for logic state match here? Should
+ * be one of PWRDM_xxx macro values
+ * @req_state: requested power state
+ *
+ * Returns: closest match for requested power state. default fallback
+ * is RET for logic state and ON for power state.
+ *
+ * This does a search from the power domain data looking for the
+ * closest valid power domain state that the hardware can achieve.
+ * PRCM definitions for PWRSTCTRL allows us to program whatever
+ * configuration we'd like, and PRCM will actually attempt such
+ * a transition, however if the powerdomain does not actually support it,
+ * we endup with a hung system. The valid power domain states are already
+ * available in our powerdomain data files. So this function tries to do
+ * the following:
+ * a) find if we have an exact match to the request - no issues.
+ * b) else find if a deeper power state is possible.
+ * c) failing which, it tries to find closest higher power state for the
+ * request.
+ */
+u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
+ bool is_logic_state, u8 req_state)
+{
+ u8 pwrdm_states = is_logic_state ? pwrdm->pwrsts_logic_ret :
+ pwrdm->pwrsts;
+ /* For logic, ret is highest and others, ON is highest */
+ u8 default_pwrst = is_logic_state ? PWRDM_POWER_RET : PWRDM_POWER_ON;
+ u8 new_pwrst;
+ bool found;
+
+ /* If it is already supported, nothing to search */
+ if (pwrdm_states & BIT(req_state))
+ return req_state;
+
+ if (!req_state)
+ goto up_search;
+
+ /*
+ * So, we dont have a exact match
+ * Can we get a deeper power state match?
+ */
+ new_pwrst = req_state - 1;
+ found = true;
+ while (!(pwrdm_states & BIT(new_pwrst))) {
+ /* No match even at OFF? Not available */
+ if (new_pwrst == PWRDM_POWER_OFF) {
+ found = false;
+ break;
+ }
+ new_pwrst--;
+ }
+
+ if (found)
+ goto done;
+
+up_search:
+ /* OK, no deeper ones, can we get a higher match? */
+ new_pwrst = req_state + 1;
+ while (!(pwrdm_states & BIT(new_pwrst))) {
+ if (new_pwrst > PWRDM_POWER_ON) {
+ WARN(1, "powerdomain: %s: Fix max powerstate to ON\n",
+ pwrdm->name);
+ return PWRDM_POWER_ON;
+ }
+
+ if (new_pwrst == default_pwrst)
+ break;
+ new_pwrst++;
+ }
+done:
+ return new_pwrst;
+}
+
+/**
* omap_set_pwrdm_state - change a powerdomain's current power state
* @pwrdm: struct powerdomain * to change the power state of
* @pwrst: power state to change to