[PATCH 0/2] Add reg_ignore_unused and pd_ignore_unused

[PATCH 0/2] Add reg_ignore_unused and pd_ignore_unused

[Tushar Behera]

These patches take inspiration from Olof's following patch.
1e435256d625 "clk: add clk_ignore_unused option to keep boot clocks on"

This options are solely for debug purposes to figure out whether
the issue at hand is because of improper shutdown of regulators or
power-domains.

Tushar Behera (2):
  PM / Domains: Add pd_ignore_unused to keep power domains enabled
  regulator: core: Add reg_ignore_unused to keep boot time regulators
    enabled

 Documentation/kernel-parameters.txt |   15 +++++++++++++++
 drivers/base/power/domain.c         |   13 +++++++++++++
 drivers/regulator/core.c            |   13 +++++++++++++
 3 files changed, 41 insertions(+)

CC: "Rafael J. Wysocki" <rjw@rjwysocki.net>
CC: linux-pm@vger.kernel.org
CC: Mark Brown <broonie@kernel.org>

-- 
1.7.9.5

[PATCH 1/2] PM / Domains: Add pd_ignore_unused to keep power domains enabled

[Tushar Behera]

Keep all power-domains already enabled by bootloader on, even if no
driver has claimed them. This is useful for debug and development, but
should not be needed on a platform with proper driver support.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
CC: "Rafael J. Wysocki" <rjw@rjwysocki.net>
CC: linux-pm@vger.kernel.org
---
 Documentation/kernel-parameters.txt |    7 +++++++
 drivers/base/power/domain.c         |   13 +++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 50a001a..96bb532 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -2557,6 +2557,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
 	pcmv=		[HW,PCMCIA] BadgePAD 4
 
+	pd_ignore_unused
+			[PM]
+			Keep all power-domains already enabled by bootloader on,
+			even if no driver has claimed them. This is useful
+			for debug and development, but should not be
+			needed on a platform with proper driver support.
+
 	pd.		[PARIDE]
 			See Documentation/blockdev/paride.txt.
 
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 6f54962..ae098a2 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -705,6 +705,14 @@ static int pm_genpd_runtime_resume(struct device *dev)
 	return 0;
 }
 
+static bool pd_ignore_unused;
+static int __init pd_ignore_unused_setup(char *__unused)
+{
+	pd_ignore_unused = true;
+	return 1;
+}
+__setup("pd_ignore_unused", pd_ignore_unused_setup);
+
 /**
  * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
  */
@@ -712,6 +720,11 @@ void pm_genpd_poweroff_unused(void)
 {
 	struct generic_pm_domain *genpd;
 
+	if (pd_ignore_unused) {
+		pr_warn("genpd: Not disabling unused power domains\n");
+		return;
+	}
+
 	mutex_lock(&gpd_list_lock);
 
 	list_for_each_entry(genpd, &gpd_list, gpd_list_node)
-- 
1.7.9.5