diff mbox series

[v3,04/11] i2c: riic: Enable runtime PM autosuspend support

Message ID 20240711115207.2843133-5-claudiu.beznea.uj@bp.renesas.com
State Superseded
Headers show
Series i2c: riic: Add support for Renesas RZ/G3S | expand

Commit Message

Claudiu Beznea July 11, 2024, 11:52 a.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Enable runtime PM autosuspend support for the RIIC driver. With this, in
case there are consecutive xfer requests the device wouldn't be runtime
enabled/disabled after each consecutive xfer but after the
the delay configured by user. With this, we can avoid touching hardware
registers involved in runtime PM suspend/resume saving in this way some
cycles. The default chosen autosuspend delay is zero to keep the
previous driver behavior.

Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---

Changes in v3:
- none

Changes in v2:
- none

 drivers/i2c/busses/i2c-riic.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

Comments

Wolfram Sang Aug. 8, 2024, 3:08 p.m. UTC | #1 
On Thu, Jul 11, 2024 at 02:52:00PM +0300, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Enable runtime PM autosuspend support for the RIIC driver. With this, in
> case there are consecutive xfer requests the device wouldn't be runtime
> enabled/disabled after each consecutive xfer but after the
> the delay configured by user. With this, we can avoid touching hardware
> registers involved in runtime PM suspend/resume saving in this way some
> cycles. The default chosen autosuspend delay is zero to keep the
> previous driver behavior.
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Basically, OK with me. I'd just like a comment here like:

/* Default 0 to save power. Can be overridden via sysfs for lower latency */
> +	pm_runtime_set_autosuspend_delay(dev, 0);
> +	pm_runtime_use_autosuspend(dev);

Other than that:

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Claudiu Beznea Aug. 9, 2024, 6:58 a.m. UTC | #2 
Hi, Wolfram,

On 08.08.2024 18:08, Wolfram Sang wrote:
> On Thu, Jul 11, 2024 at 02:52:00PM +0300, Claudiu wrote:
>> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>>
>> Enable runtime PM autosuspend support for the RIIC driver. With this, in
>> case there are consecutive xfer requests the device wouldn't be runtime
>> enabled/disabled after each consecutive xfer but after the
>> the delay configured by user. With this, we can avoid touching hardware
>> registers involved in runtime PM suspend/resume saving in this way some
>> cycles. The default chosen autosuspend delay is zero to keep the
>> previous driver behavior.
>>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
> 
> Basically, OK with me. I'd just like a comment here like:
> 
> /* Default 0 to save power. Can be overridden via sysfs for lower latency */

Ok, I'll update it in the next version.

Thank you,
Claudiu Beznea

>> +	pm_runtime_set_autosuspend_delay(dev, 0);
>> +	pm_runtime_use_autosuspend(dev);
> 
> Other than that:
> 
> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
>
diff mbox series

Patch

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 068f90ecf27e..46765715d39f 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -171,7 +171,8 @@  static int riic_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
 	}
 
  out:
-	pm_runtime_put(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 
 	return riic->err ?: num;
 }
@@ -399,7 +400,8 @@  static int riic_init_hw(struct riic_dev *riic, struct i2c_timings *t)
 
 	riic_clear_set_bit(riic, ICCR1_IICRST, 0, RIIC_ICCR1);
 
-	pm_runtime_put(dev);
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_put_autosuspend(dev);
 	return 0;
 }
 
@@ -479,6 +481,8 @@  static int riic_i2c_probe(struct platform_device *pdev)
 
 	i2c_parse_fw_timings(dev, &i2c_t, true);
 
+	pm_runtime_set_autosuspend_delay(dev, 0);
+	pm_runtime_use_autosuspend(dev);
 	pm_runtime_enable(dev);
 
 	ret = riic_init_hw(riic, &i2c_t);
@@ -496,6 +500,7 @@  static int riic_i2c_probe(struct platform_device *pdev)
 
 out:
 	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
 	return ret;
 }
 
@@ -512,6 +517,7 @@  static void riic_i2c_remove(struct platform_device *pdev)
 	}
 	i2c_del_adapter(&riic->adapter);
 	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
 }
 
 static const struct riic_of_data riic_rz_a_info = {