diff mbox

[V2,4/7] ARM: OMAP2+: powerdomain: introduce logic for finding valid power domain

Message ID 1409165694-26568-1-git-send-email-nm@ti.com
State Accepted
Commit bd002d7bdafc695decf7d4aeba285097356938f1
Headers show

Commit Message

Nishanth Menon Aug. 27, 2014, 6:54 p.m. UTC
powerdomain configuration in OMAP is done using PWRSTCTRL register for
each power domain. However, PRCM lets us write any value we'd like to
the logic and power domain target states, however the SoC integration
tends to actually function only at a few discrete states. These valid
states are already in our powerdomains_xxx_data.c file.

So, provide a function to easily query valid low power state that the
power domain is allowed to go to.

Based on work originally done by Jean Pihet <j-pihet@ti.com>
https://patchwork.kernel.org/patch/1325091/ . There is no attempt to
create a new powerdomain solution here, except fixing issues seen
attempting invalid programming attempts. Future consolidation to the
generic powerdomain framework should consider this requirement as
well.

Similar solutions have been done in product kernels in the past such
as:
https://android.googlesource.com/kernel/omap.git/+blame/android-omap-panda-3.0/arch/arm/mach-omap2/pm44xx.c

Reviewed-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
---

Not posting the entire series again and updating just this patch..

V2: drop BUG in favor of WARN, picked up Santosh and Kevin's acks.

V1: https://patchwork.kernel.org/patch/4764131/

 arch/arm/mach-omap2/powerdomain.c |   76 +++++++++++++++++++++++++++++++++++++
 arch/arm/mach-omap2/powerdomain.h |    3 ++
 2 files changed, 79 insertions(+)

Comments

Kevin Hilman Aug. 27, 2014, 8:25 p.m. UTC | #1
Nishanth Menon <nm@ti.com> writes:

> powerdomain configuration in OMAP is done using PWRSTCTRL register for
> each power domain. However, PRCM lets us write any value we'd like to
> the logic and power domain target states, however the SoC integration
> tends to actually function only at a few discrete states. These valid
> states are already in our powerdomains_xxx_data.c file.
>
> So, provide a function to easily query valid low power state that the
> power domain is allowed to go to.
>
> Based on work originally done by Jean Pihet <j-pihet@ti.com>
> https://patchwork.kernel.org/patch/1325091/ . There is no attempt to
> create a new powerdomain solution here, except fixing issues seen
> attempting invalid programming attempts. Future consolidation to the
> generic powerdomain framework should consider this requirement as
> well.
>
> Similar solutions have been done in product kernels in the past such
> as:
> https://android.googlesource.com/kernel/omap.git/+blame/android-omap-panda-3.0/arch/arm/mach-omap2/pm44xx.c
>
> Reviewed-by: Kevin Hilman <khilman@linaro.org>
> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Signed-off-by: Nishanth Menon <nm@ti.com>
> ---
>
> Not posting the entire series again and updating just this patch..
>
> V2: drop BUG in favor of WARN, picked up Santosh and Kevin's acks.

Looks good, thanks,

Kevin
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diff mbox

Patch

diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index f391948..7fb033e 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -1081,6 +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
diff --git a/arch/arm/mach-omap2/powerdomain.h b/arch/arm/mach-omap2/powerdomain.h
index a754c82..11bd4dd 100644
--- a/arch/arm/mach-omap2/powerdomain.h
+++ b/arch/arm/mach-omap2/powerdomain.h
@@ -220,6 +220,9 @@  struct voltagedomain *pwrdm_get_voltdm(struct powerdomain *pwrdm);
 
 int pwrdm_get_mem_bank_count(struct powerdomain *pwrdm);
 
+u8 pwrdm_get_valid_lp_state(struct powerdomain *pwrdm,
+			    bool is_logic_state, u8 req_state);
+
 int pwrdm_set_next_pwrst(struct powerdomain *pwrdm, u8 pwrst);
 int pwrdm_read_next_pwrst(struct powerdomain *pwrdm);
 int pwrdm_read_pwrst(struct powerdomain *pwrdm);