From: Ulf Hansson <ulf.hansson@linaro.org>
To: "Rafael J . Wysocki" <rjw@rjwysocki.net>,
Sudeep Holla <sudeep.holla@arm.com>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
linux-pm@vger.kernel.org
Cc: Kevin Hilman <khilman@kernel.org>,
Lina Iyer <ilina@codeaurora.org>,
Lina Iyer <lina.iyer@linaro.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Rob Herring <robh+dt@kernel.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>,
Vincent Guittot <vincent.guittot@linaro.org>,
Stephen Boyd <sboyd@kernel.org>, Juri Lelli <juri.lelli@arm.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v7 02/26] PM / Domains: Deal with multiple states but no governor in genpd
Date: Thu, 12 Apr 2018 13:14:07 +0200 [thread overview]
Message-ID: <1523531671-27491-3-git-send-email-ulf.hansson@linaro.org> (raw)
In-Reply-To: <1523531671-27491-1-git-send-email-ulf.hansson@linaro.org>
A caller of pm_genpd_init() that provides some states for the genpd via the
->states pointer in the struct generic_pm_domain, should also provide a
governor. This because it's the job of the governor to pick a state that
satisfies the constraints.
Therefore, let's print a warning to inform the user about such bogus
configuration and avoid to bail out, by instead picking the shallowest
state before genpd invokes the ->power_off() callback.
Cc: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---
drivers/base/power/domain.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index c2ef944..9aff79d 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -466,6 +466,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
return -EAGAIN;
}
+ /* Default to shallowest state. */
+ if (!genpd->gov)
+ genpd->state_idx = 0;
+
if (genpd->power_off) {
int ret;
@@ -1694,6 +1698,8 @@ int pm_genpd_init(struct generic_pm_domain *genpd,
ret = genpd_set_default_power_state(genpd);
if (ret)
return ret;
+ } else if (!gov) {
+ pr_warn("%s : no governor for states\n", genpd->name);
}
mutex_lock(&gpd_list_lock);
--
2.7.4
next prev parent reply other threads:[~2018-04-12 11:14 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-12 11:14 [PATCH v7 00/26] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 01/26] PM / Domains: Don't treat zero found compatible idle states as an error Ulf Hansson
2018-04-16 17:33 ` Lina Iyer
2018-04-12 11:14 ` Ulf Hansson [this message]
2018-04-16 17:34 ` [PATCH v7 02/26] PM / Domains: Deal with multiple states but no governor in genpd Lina Iyer
2018-04-12 11:14 ` [PATCH v7 03/26] PM / Domains: Add generic data pointer to genpd_power_state struct Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 04/26] PM / Domains: Add support for CPU devices to genpd Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 05/26] PM / Domains: Add helper functions to attach/detach CPUs to/from genpd Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 06/26] timer: Export next wakeup time of a CPU Ulf Hansson
2018-04-13 8:47 ` Rafael J. Wysocki
2018-04-15 12:02 ` Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 07/26] PM / Domains: Add genpd governor for CPUs Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 08/26] PM / Domains: Extend genpd CPU governor to cope with QoS constraints Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 09/26] kernel/cpu_pm: Manage runtime PM in the idle path for CPUs Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 10/26] dt: psci: Update DT bindings to support hierarchical PSCI states Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 11/26] of: base: Add of_get_cpu_state_node() to get idle states for a CPU node Ulf Hansson
2018-04-13 15:05 ` Rob Herring
2018-04-15 11:59 ` Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 12/26] cpuidle: dt: Support hierarchical CPU idle states Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 13/26] drivers: firmware: psci: Move psci to separate directory Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 14/26] MAINTAINERS: Update files for PSCI Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 15/26] drivers: firmware: psci: Split psci_dt_cpu_init_idle() Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 16/26] drivers: firmware: psci: Support hierarchical CPU idle states Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 17/26] drivers: firmware: psci: Simplify error path of psci_dt_init() Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 18/26] drivers: firmware: psci: Announce support for OS initiated suspend mode Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 19/26] drivers: firmware: psci: Prepare to use " Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 20/26] drivers: firmware: psci: Share a few internal PSCI functions Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 21/26] drivers: firmware: psci: Add support for PM domains using genpd Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 22/26] drivers: firmware: psci: Introduce psci_dt_topology_init() Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 23/26] drivers: firmware: psci: Try to attach CPU devices to their PM domains Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 24/26] drivers: firmware: psci: Deal with CPU hotplug when using OSI mode Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 25/26] arm64: kernel: Respect the hierarchical CPU topology in DT for PSCI Ulf Hansson
2018-04-12 11:14 ` [PATCH v7 26/26] arm64: dts: Convert to the hierarchical CPU topology layout for MSM8916 Ulf Hansson
2018-05-24 9:16 ` [PATCH v7 00/26] PM / Domains: Support hierarchical CPU arrangement (PSCI/ARM) Ulf Hansson
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