From: Dmitry Osipenko <digetx@gmail.com>
To: "Thierry Reding" <thierry.reding@gmail.com>,
"MyungJoo Ham" <myungjoo.ham@samsung.com>,
"Kyungmin Park" <kyungmin.park@samsung.com>,
"Chanwoo Choi" <cw00.choi@samsung.com>,
"Jonathan Hunter" <jonathanh@nvidia.com>,
"Tomeu Vizoso" <tomeu.vizoso@collabora.com>,
"Peter Geis" <pgwipeout@gmail.com>,
"Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v9 02/19] PM / devfreq: tegra30: Keep interrupt disabled while governor is stopped
Date: Tue, 5 Nov 2019 00:56:00 +0300 [thread overview]
Message-ID: <20191104215617.25544-3-digetx@gmail.com> (raw)
In-Reply-To: <20191104215617.25544-1-digetx@gmail.com>
There is no real need to keep interrupt always-enabled, will be nicer
to keep it disabled while governor is inactive.
Suggested-by: Thierry Reding <thierry.reding@gmail.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Peter Geis <pgwipeout@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/devfreq/tegra30-devfreq.c | 47 ++++++++++++++++---------------
1 file changed, 24 insertions(+), 23 deletions(-)
diff --git a/drivers/devfreq/tegra30-devfreq.c b/drivers/devfreq/tegra30-devfreq.c
index a27300f40b0b..a0a5f3f7b789 100644
--- a/drivers/devfreq/tegra30-devfreq.c
+++ b/drivers/devfreq/tegra30-devfreq.c
@@ -11,6 +11,7 @@
#include <linux/devfreq.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/irq.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
@@ -416,8 +417,6 @@ static void tegra_actmon_start(struct tegra_devfreq *tegra)
{
unsigned int i;
- disable_irq(tegra->irq);
-
actmon_writel(tegra, ACTMON_SAMPLING_PERIOD - 1,
ACTMON_GLB_PERIOD_CTRL);
@@ -442,8 +441,6 @@ static void tegra_actmon_stop(struct tegra_devfreq *tegra)
}
actmon_write_barrier(tegra);
-
- enable_irq(tegra->irq);
}
static int tegra_devfreq_target(struct device *dev, unsigned long *freq,
@@ -552,6 +549,12 @@ static int tegra_governor_event_handler(struct devfreq *devfreq,
{
struct tegra_devfreq *tegra = dev_get_drvdata(devfreq->dev.parent);
+ /*
+ * Couple devfreq-device with the governor early because it is
+ * needed at the moment of governor's start (used by ISR).
+ */
+ tegra->devfreq = devfreq;
+
switch (event) {
case DEVFREQ_GOV_START:
devfreq_monitor_start(devfreq);
@@ -586,10 +589,11 @@ static struct devfreq_governor tegra_devfreq_governor = {
static int tegra_devfreq_probe(struct platform_device *pdev)
{
- struct tegra_devfreq *tegra;
struct tegra_devfreq_device *dev;
- unsigned int i;
+ struct tegra_devfreq *tegra;
+ struct devfreq *devfreq;
unsigned long rate;
+ unsigned int i;
int err;
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
@@ -625,6 +629,16 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
}
tegra->irq = err;
+ irq_set_status_flags(tegra->irq, IRQ_NOAUTOEN);
+
+ err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
+ actmon_thread_isr, IRQF_ONESHOT,
+ "tegra-devfreq", tegra);
+ if (err) {
+ dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
+ return err;
+ }
+
reset_control_assert(tegra->reset);
err = clk_prepare_enable(tegra->clock);
@@ -672,28 +686,15 @@ static int tegra_devfreq_probe(struct platform_device *pdev)
}
tegra_devfreq_profile.initial_freq = clk_get_rate(tegra->emc_clock);
- tegra->devfreq = devfreq_add_device(&pdev->dev,
- &tegra_devfreq_profile,
- "tegra_actmon",
- NULL);
- if (IS_ERR(tegra->devfreq)) {
- err = PTR_ERR(tegra->devfreq);
+ devfreq = devfreq_add_device(&pdev->dev, &tegra_devfreq_profile,
+ "tegra_actmon", NULL);
+ if (IS_ERR(devfreq)) {
+ err = PTR_ERR(devfreq);
goto remove_governor;
}
- err = devm_request_threaded_irq(&pdev->dev, tegra->irq, NULL,
- actmon_thread_isr, IRQF_ONESHOT,
- "tegra-devfreq", tegra);
- if (err) {
- dev_err(&pdev->dev, "Interrupt request failed: %d\n", err);
- goto remove_devfreq;
- }
-
return 0;
-remove_devfreq:
- devfreq_remove_device(tegra->devfreq);
-
remove_governor:
devfreq_remove_governor(&tegra_devfreq_governor);
--
2.23.0
next prev parent reply other threads:[~2019-11-04 22:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-04 21:55 [PATCH v9 00/19] More improvements for Tegra30 devfreq driver Dmitry Osipenko
2019-11-04 21:55 ` [PATCH v9 01/19] PM / devfreq: tegra30: Change irq type to unsigned int Dmitry Osipenko
2019-11-04 21:56 ` Dmitry Osipenko [this message]
2019-11-04 21:56 ` [PATCH v9 03/19] PM / devfreq: tegra30: Handle possible round-rate error Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 04/19] PM / devfreq: tegra30: Drop write-barrier Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 05/19] PM / devfreq: tegra30: Fix integer overflow on CPU's freq max out Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 06/19] PM / devfreq: tegra30: Use kHz units uniformly in the code Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 07/19] PM / devfreq: tegra30: Use CPUFreq notifier Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 08/19] PM / devfreq: tegra30: Move clk-notifier's registration to governor's start Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 09/19] PM / devfreq: tegra30: Reset boosting on startup Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 10/19] PM / devfreq: tegra30: Don't enable consecutive-down interrupt " Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 11/19] PM / devfreq: tegra30: Constify structs Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 12/19] PM / devfreq: tegra30: Include appropriate header Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 13/19] PM / devfreq: tegra30: Don't enable already enabled consecutive interrupts Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 14/19] PM / devfreq: tegra30: Disable consecutive interrupts when appropriate Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 15/19] PM / devfreq: tegra30: Use kHz units for dependency threshold Dmitry Osipenko
2019-11-05 4:02 ` Chanwoo Choi
2019-11-04 21:56 ` [PATCH v9 16/19] PM / devfreq: Add new interrupt_driven flag for governors Dmitry Osipenko
2019-11-05 4:01 ` Chanwoo Choi
2019-11-04 21:56 ` [PATCH v9 17/19] PM / devfreq: tegra30: Support variable polling interval Dmitry Osipenko
2019-11-05 4:02 ` Chanwoo Choi
2019-11-04 21:56 ` [PATCH v9 18/19] PM / devfreq: tegra30: Tune up MCCPU boost-down coefficient Dmitry Osipenko
2019-11-04 21:56 ` [PATCH v9 19/19] PM / devfreq: tegra20/30: Add Dmitry as a maintainer Dmitry Osipenko
2019-11-05 4:07 ` Chanwoo Choi
2019-11-05 13:29 ` Dmitry Osipenko
2019-11-06 1:24 ` Chanwoo Choi
2019-11-06 16:14 ` Dmitry Osipenko
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