On 29 April 2018 at 20:41, Wolfram Sang
<wsa+rene...@sang-engineering.com> wrote:
> These days, the I2C core ensures that the embedded adapter device
> ignores the PM states of its children already. Because the adapter
> device is an opaque logical device, there is no need for drivers to
> repeat that again.
>
> Signed-off-by: Wolfram Sang <wsa+rene...@sang-engineering.com>
Reviewed-by: Ulf Hansson <ulf.hans...@linaro.org>
Kind regards
Uffe
> ---
>
> I tested it using a Renesas Salvator-X board (M3-W) which has an EEPROM
> connected to a bus driven by the i2c-sh_mobile driver. The EEPROM driver
> (at24)
> immediately sets the RPM state to 'active'. Even with this patch applied, it
> does not affect the state of the parent platform_device. Only if I remove
> 'pm_suspend_ignore_children' from the I2C core, too, then the 'active' state
> from the client is passed on to the host adapter.
>
> I think this is a sufficient test, but please double check.
>
> drivers/i2c/busses/i2c-hix5hd2.c | 1 -
> drivers/i2c/busses/i2c-nomadik.c | 2 --
> drivers/i2c/busses/i2c-sh_mobile.c | 11 -----------
> 3 files changed, 14 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-hix5hd2.c
> b/drivers/i2c/busses/i2c-hix5hd2.c
> index bb68957d3da5..1504c3c1a1c0 100644
> --- a/drivers/i2c/busses/i2c-hix5hd2.c
> +++ b/drivers/i2c/busses/i2c-hix5hd2.c
> @@ -471,7 +471,6 @@ static int hix5hd2_i2c_probe(struct platform_device *pdev)
> goto err_clk;
> }
>
> - pm_suspend_ignore_children(&pdev->dev, true);
> pm_runtime_set_autosuspend_delay(priv->dev, MSEC_PER_SEC);
> pm_runtime_use_autosuspend(priv->dev);
> pm_runtime_set_active(priv->dev);
> diff --git a/drivers/i2c/busses/i2c-nomadik.c
> b/drivers/i2c/busses/i2c-nomadik.c
> index 49c7c0c91486..0ed5a41804dc 100644
> --- a/drivers/i2c/busses/i2c-nomadik.c
> +++ b/drivers/i2c/busses/i2c-nomadik.c
> @@ -1012,8 +1012,6 @@ static int nmk_i2c_probe(struct amba_device *adev,
> const struct amba_id *id)
> goto err_no_mem;
> }
>
> - pm_suspend_ignore_children(&adev->dev, true);
> -
> dev->clk = devm_clk_get(&adev->dev, NULL);
> if (IS_ERR(dev->clk)) {
> dev_err(&adev->dev, "could not get i2c clock\n");
> diff --git a/drivers/i2c/busses/i2c-sh_mobile.c
> b/drivers/i2c/busses/i2c-sh_mobile.c
> index d856bc211715..5fda4188a9e5 100644
> --- a/drivers/i2c/busses/i2c-sh_mobile.c
> +++ b/drivers/i2c/busses/i2c-sh_mobile.c
> @@ -899,17 +899,6 @@ static int sh_mobile_i2c_probe(struct platform_device
> *dev)
> if (resource_size(res) > 0x17)
> pd->flags |= IIC_FLAG_HAS_ICIC67;
>
> - /* Enable Runtime PM for this device.
> - *
> - * Also tell the Runtime PM core to ignore children
> - * for this device since it is valid for us to suspend
> - * this I2C master driver even though the slave devices
> - * on the I2C bus may not be suspended.
> - *
> - * The state of the I2C hardware bus is unaffected by
> - * the Runtime PM state.
> - */
> - pm_suspend_ignore_children(&dev->dev, true);
> pm_runtime_enable(&dev->dev);
> pm_runtime_get_sync(&dev->dev);
>
> --
> 2.11.0
>
