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From: Ulf Hansson <ulf.hansson@linaro.org>
To: "Rafael J . Wysocki" <rjw@rjwysocki.net>, linux-pm@vger.kernel.org
Cc: Ulf Hansson <ulf.hansson@linaro.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jon Hunter <jonathanh@nvidia.com>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Todor Tomov <todor.tomov@linaro.org>,
	Rajendra Nayak <rnayak@codeaurora.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Kevin Hilman <khilman@kernel.org>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-tegra@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	devicetree@vger.kernel.org
Subject: [PATCH v2 6/9] PM / Domains: Don't attach devices in genpd with multi PM domains
Date: Tue, 29 May 2018 12:04:18 +0200	[thread overview]
Message-ID: <20180529100421.31022-7-ulf.hansson@linaro.org> (raw)
In-Reply-To: <20180529100421.31022-1-ulf.hansson@linaro.org>

The power-domain DT property may now contain a list of PM domain
specifiers, which represents that a device are partitioned across multiple
PM domains. This leads to a new situation in genpd_dev_pm_attach(), as only
one PM domain can be attached per device.

To remain things simple for the most common configuration, when a single PM
domain is used, let's treat the multiple PM domain case as being specific.

In other words, let's change genpd_dev_pm_attach() to check for multiple PM
domains and prevent it from attach any PM domain for this case. Instead,
leave this to be managed separately, from following changes to genpd.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Suggested-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
---

Changes in v2:
	- Minor update to changelog to mention "PM domain specifiers" rather
	than a "list of phandles".

---
 drivers/base/power/domain.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 7ebf7993273a..12a20f21974d 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2229,10 +2229,10 @@ static void genpd_dev_pm_sync(struct device *dev)
  * attaches the device to retrieved pm_domain ops.
  *
  * Returns 1 on successfully attached PM domain, 0 when the device don't need a
- * PM domain or a negative error code in case of failures. Note that if a
- * power-domain exists for the device, but it cannot be found or turned on,
- * then return -EPROBE_DEFER to ensure that the device is not probed and to
- * re-try again later.
+ * PM domain or when multiple power-domains exists for it, else a negative error
+ * code. Note that if a power-domain exists for the device, but it cannot be
+ * found or turned on, then return -EPROBE_DEFER to ensure that the device is
+ * not probed and to re-try again later.
  */
 int genpd_dev_pm_attach(struct device *dev)
 {
@@ -2243,10 +2243,18 @@ int genpd_dev_pm_attach(struct device *dev)
 	if (!dev->of_node)
 		return 0;
 
+	/*
+	 * Devices with multiple PM domains must be attached separately, as we
+	 * can only attach one PM domain per device.
+	 */
+	if (of_count_phandle_with_args(dev->of_node, "power-domains",
+				       "#power-domain-cells") != 1)
+		return 0;
+
 	ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
 					"#power-domain-cells", 0, &pd_args);
 	if (ret < 0)
-		return 0;
+		return ret;
 
 	mutex_lock(&gpd_list_lock);
 	pd = genpd_get_from_provider(&pd_args);
-- 
2.17.0

  parent reply	other threads:[~2018-05-29 10:05 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29 10:04 [PATCH v2 0/9] PM / Domains: Add support for multi PM domains per device Ulf Hansson
2018-05-29 10:04 ` [PATCH v2 1/9] PM / Domains: Drop extern declarations of functions in pm_domain.h Ulf Hansson
2018-05-31  6:12   ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 2/9] PM / Domains: Drop __pm_genpd_add_device() Ulf Hansson
2018-05-31  6:13   ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 3/9] PM / Domains: Drop genpd as in-param for pm_genpd_remove_device() Ulf Hansson
2018-05-31  6:15   ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 4/9] PM / Domains: Drop unused parameter in genpd_allocate_dev_data() Ulf Hansson
2018-05-31  6:16   ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 5/9] PM / Domains: dt: Allow power-domain property to be a list of specifiers Ulf Hansson
2018-05-31  3:53   ` Rob Herring
2018-05-31  6:18   ` Viresh Kumar
2018-05-29 10:04 ` Ulf Hansson [this message]
2018-05-30 16:06   ` [PATCH v2 6/9] PM / Domains: Don't attach devices in genpd with multi PM domains Jon Hunter
2018-05-29 10:04 ` [PATCH v2 7/9] PM / Domains: Split genpd_dev_pm_attach() Ulf Hansson
2018-05-30 16:08   ` Jon Hunter
2018-05-31  7:04   ` Viresh Kumar
2018-05-29 10:04 ` [PATCH v2 8/9] PM / Domains: Add support for multi PM domains per device to genpd Ulf Hansson
2018-05-30 16:04   ` Jon Hunter
2018-05-31  6:17     ` Ulf Hansson
2018-05-31  8:03       ` Jon Hunter
2018-05-31 10:44         ` Ulf Hansson
2018-05-31 10:48           ` Jon Hunter
2018-05-29 10:04 ` [PATCH v2 9/9] PM / Domains: Add dev_pm_domain_attach_by_id() to manage multi PM domains Ulf Hansson
2018-05-30  9:19   ` Jon Hunter
2018-05-30 11:31     ` Ulf Hansson
2018-05-30 14:30       ` Jon Hunter
2018-06-27  8:55         ` Rajendra Nayak
2018-06-27  9:05           ` Ulf Hansson
2018-06-27  9:29             ` Rajendra Nayak
2018-05-30  9:30 ` [PATCH v2 0/9] PM / Domains: Add support for multi PM domains per device Rafael J. Wysocki
2018-05-30 11:34   ` Ulf Hansson
2018-05-31  9:14 ` Viresh Kumar
2018-05-31 10:47   ` Ulf Hansson

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