linux-kernel - Re: [PATCH 3/4] i2c: designware-pcidrv: enable RuntimePM before registering to the core

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Date:	Wed, 20 Apr 2016 16:03:01 +0300
From:	Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:	Jisheng Zhang <jszhang@...vell.com>,
	andriy.shevchenko@...ux.intel.com, mika.westerberg@...ux.intel.com,
	wsa@...-dreams.de
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/4] i2c: designware-pcidrv: enable RuntimePM before
 registering to the core

On 04/14/2016 03:53 PM, Jisheng Zhang wrote:
> As pointed out by commit 36d48fb5766a ("i2c: designware-platdrv: enable
> RuntimePM before registering to the core"), "The core may register
> clients attached to this master which may use funtionality from the
> master", so enable RuntimePM before registering to the core.
>
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>
> ---
>   drivers/i2c/busses/i2c-designware-pcidrv.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-designware-pcidrv.c b/drivers/i2c/busses/i2c-designware-pcidrv.c
> index 7368be0..41a01a7 100644
> --- a/drivers/i2c/busses/i2c-designware-pcidrv.c
> +++ b/drivers/i2c/busses/i2c-designware-pcidrv.c
> @@ -248,14 +248,17 @@ static int i2c_dw_pci_probe(struct pci_dev *pdev,
>   	ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
>   	adap->nr = controller->bus_num;
>
> +	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
> +	pm_runtime_use_autosuspend(&pdev->dev);
> +	pm_runtime_allow(&pdev->dev);
> +
>   	r = i2c_dw_probe(dev);
> -	if (r)
> +	if (r) {
> +		pm_runtime_forbid(&pdev->dev);
>   		return r;
> +	}
>
> -	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
> -	pm_runtime_use_autosuspend(&pdev->dev);
>   	pm_runtime_put_autosuspend(&pdev->dev);
> -	pm_runtime_allow(&pdev->dev);
>
Last time I checked this I didn't see urgent reason for the move because 
runtime PM is enabled for PCI devices by default via pci_device_add() -> 
pci_init_capabilities() -> pci_pm_init() -> pm_runtime_enable().

-- 
Jarkko