From: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
To: "Rafael J. Wysocki" <rafael@kernel.org>,
Kevin Hilman <khilman@kernel.org>,
Ulf Hansson <ulf.hansson@linaro.org>,
Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
NXP Linux Team <linux-imx@nxp.com>
Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Dong Aisheng <aisheng.dong@nxp.com>, Peng Fan <peng.fan@nxp.com>
Subject: [PATCH 2/3] PM / Domains: Choose the deepest state to enter if no devices using it
Date: Wed, 13 Sep 2023 10:05:37 +0800 [thread overview]
Message-ID: <20230913-multiple-state-scu-v1-2-9d91c6904ffa@nxp.com> (raw)
In-Reply-To: <20230913-multiple-state-scu-v1-0-9d91c6904ffa@nxp.com>
From: Dong Aisheng <aisheng.dong@nxp.com>
For a domain has no working devices anymore, let's choose the deepest state
to enter to save power. e.g. driver probe failure.
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
---
drivers/base/power/domain.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 22cfa3020b18..1887eb1b3130 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -730,6 +730,10 @@ static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
if (atomic_read(&genpd->sd_count) > 0)
return -EBUSY;
+ /* Choose the deepest state if no devices using this domain */
+ if (!genpd->device_count)
+ genpd->state_idx = genpd->state_count - 1;
+
ret = _genpd_power_off(genpd, true);
if (ret) {
genpd->states[genpd->state_idx].rejected++;
--
2.37.1
next prev parent reply other threads:[~2023-09-13 2:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-13 2:05 [PATCH 0/3] genpd: imx8: support multiple states Peng Fan (OSS)
2023-09-13 2:05 ` [PATCH 1/3] PM / Domains: Support enter deepest state for multiple states domains Peng Fan (OSS)
2023-09-13 2:05 ` Peng Fan (OSS) [this message]
2023-09-13 2:05 ` [PATCH 3/3] genpd: imx: scu-pd: add multi states support Peng Fan (OSS)
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