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i2c: riic: Enable runtime PM autosuspend support

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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.

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Claudiu Beznea 2024-08-20 13:19:11 +03:00 committed by Andi Shyti
parent 3149a9cf36
commit 10d5c8845d
1 changed files with 9 additions and 2 deletions
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11
drivers/i2c/busses/i2c-riic.c
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@ -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 +481,9 @@ static int riic_i2c_probe(struct platform_device *pdev)
i2c_parse_fw_timings(dev, &i2c_t, true);
/* 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);
pm_runtime_enable(dev);
ret = riic_init_hw(riic, &i2c_t);
@ -496,6 +501,7 @@ static int riic_i2c_probe(struct platform_device *pdev)
out:
pm_runtime_disable(dev);
pm_runtime_dont_use_autosuspend(dev);
return ret;
}
@ -512,6 +518,7 @@ 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 = {