From: <Claudiu.Beznea@microchip.com>
To: <Nicolas.Ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
<Ludovic.Desroches@microchip.com>, <linux@armlinux.org.uk>,
<lgirdwood@gmail.com>, <broonie@kernel.org>, <rjw@rjwysocki.net>,
<pavel@ucw.cz>, <len.brown@intel.com>
Cc: Claudiu.Beznea@microchip.com, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org
Subject: [PATCH v2 3/3] ARM: at91: pm: add support for .off_in_suspend
Date: Tue, 8 Jan 2019 10:56:35 +0000 [thread overview]
Message-ID: <1546944944-13911-4-git-send-email-claudiu.beznea@microchip.com> (raw)
In-Reply-To: <1546944944-13911-1-git-send-email-claudiu.beznea@microchip.com>
From: Claudiu Beznea <claudiu.beznea@microchip.com>
Add support to check if platform is off in suspend. The check is based on
pm_data.mode and CPU's regulator which will be turn off in suspend.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
arch/arm/mach-at91/pm.c | 61 +++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 57 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index 51e808adb00c..be9bd482772b 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/parser.h>
+#include <linux/regulator/consumer.h>
#include <linux/suspend.h>
#include <linux/clk/at91_pmc.h>
@@ -164,6 +165,47 @@ static int at91_pm_config_ws(unsigned int pm_mode, bool set)
return mode ? 0 : -EPERM;
}
+static const struct of_device_id sama5d2_cpu_reg_ids[] = {
+ { .compatible = "active-semi,act8945a", .data = "VDD_1V2" },
+ { /* sentinel */ }
+};
+
+static struct regulator *at91_pm_cpu_regulator_get(void)
+{
+ struct device *cpu_dev = get_cpu_device(0);
+ static struct regulator *cpu_reg;
+ const struct of_device_id *match;
+ struct platform_device *pdev;
+ struct device_node *np;
+
+ if (!cpu_dev)
+ return cpu_reg;
+
+ if (!cpu_reg) {
+ for_each_matching_node_and_match(np, sama5d2_cpu_reg_ids,
+ &match) {
+ pdev = of_find_device_by_node(np);
+ if (!pdev)
+ continue;
+
+ cpu_reg = regulator_get(cpu_dev, match->data);
+ put_device(&pdev->dev);
+ break;
+ }
+ }
+
+ return cpu_reg;
+}
+
+static bool at91_pm_state_allowed(suspend_state_t state)
+{
+ struct regulator *reg;
+
+ reg = at91_pm_cpu_regulator_get();
+
+ return reg && regulator_is_disabled_in_suspend(reg, state);
+}
+
/*
* Called after processes are frozen, but before we shutdown devices.
*/
@@ -182,6 +224,9 @@ static int at91_pm_begin(suspend_state_t state)
pm_data.mode = -1;
}
+ if (pm_data.mode == AT91_PM_BACKUP && !at91_pm_state_allowed(state))
+ return -EPERM;
+
return at91_pm_config_ws(pm_data.mode, true);
}
@@ -321,12 +366,20 @@ static void at91_pm_end(void)
at91_pm_config_ws(pm_data.mode, false);
}
+static bool at91_pm_off_in_suspend(suspend_state_t state)
+{
+ if (pm_data.mode != AT91_PM_BACKUP)
+ return false;
+
+ return at91_pm_state_allowed(state);
+}
static const struct platform_suspend_ops at91_pm_ops = {
- .valid = at91_pm_valid_state,
- .begin = at91_pm_begin,
- .enter = at91_pm_enter,
- .end = at91_pm_end,
+ .valid = at91_pm_valid_state,
+ .begin = at91_pm_begin,
+ .enter = at91_pm_enter,
+ .end = at91_pm_end,
+ .off_in_suspend = at91_pm_off_in_suspend,
};
static struct platform_device at91_cpuidle_device = {
--
2.7.4
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-01-08 10:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-08 10:56 [PATCH v2 0/3] add support for power off check in suspend Claudiu.Beznea
2019-01-08 10:56 ` [PATCH v2 1/3] PM / Suspend: Add support to check if platform's power is off " Claudiu.Beznea
2019-01-09 14:14 ` Pavel Machek
2019-01-10 10:24 ` Claudiu.Beznea
2019-01-08 10:56 ` [PATCH v2 2/3] regulator: core: add helper to check if regulator is disabled " Claudiu.Beznea
2019-01-09 16:57 ` Mark Brown
2019-01-10 10:24 ` Claudiu.Beznea
2019-01-11 12:39 ` Mark Brown
2019-01-11 14:08 ` Claudiu.Beznea
2019-01-14 22:53 ` Mark Brown
2019-01-15 9:19 ` Claudiu.Beznea
2019-01-08 10:56 ` Claudiu.Beznea [this message]
2019-01-08 11:46 ` [PATCH v2 0/3] add support for power off check " Rafael J. Wysocki
2019-01-08 14:07 ` Claudiu.Beznea
2019-01-28 9:50 ` Claudiu.Beznea
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1546944944-13911-4-git-send-email-claudiu.beznea@microchip.com \
--to=claudiu.beznea@microchip.com \
--cc=Ludovic.Desroches@microchip.com \
--cc=Nicolas.Ferre@microchip.com \
--cc=alexandre.belloni@bootlin.com \
--cc=broonie@kernel.org \
--cc=len.brown@intel.com \
--cc=lgirdwood@gmail.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=pavel@ucw.cz \
--cc=rjw@rjwysocki.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).