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

Claudiu
2024-06-21T11:23:26Z

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

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 6b739483ef37..00fb09786e48 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;
}

@@ -521,6 +526,7 @@ static void riic_i2c_remove(struct platform_device *pdev)
pm_runtime_put(dev);
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 = {
--
2.39.2