diff mbox series

[v2,05/12] i2c: riic: Enable runtime PM autosuspend support

Message ID 20240625121358.590547-6-claudiu.beznea.uj@bp.renesas.com
State Superseded
Headers show
Series [v2,01/12] clk: renesas: r9a08g045: Add clock, reset and power domain support for I2C | expand

Commit Message

Claudiu Beznea June 25, 2024, 12:13 p.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 v2:
- none

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

Patch

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 002b11b020fa..24c0d62544fb 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -175,7 +175,8 @@  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;
 }
@@ -405,7 +406,8 @@  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;
 }
 
@@ -485,6 +487,8 @@  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);
@@ -502,6 +506,7 @@  static int riic_i2c_probe(struct platform_device *pdev)
 
 out:
 	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
 	return ret;
 }
 
@@ -522,6 +527,7 @@  static void riic_i2c_remove(struct platform_device *pdev)
 	}
 
 	pm_runtime_disable(dev);
+	pm_runtime_dont_use_autosuspend(dev);
 }
 
 static const struct riic_of_data riic_rz_a_info = {