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SubjectRe: [PATCH v3 1/2] i2c: davinci: Add PM Runtime Support
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On Friday 08 September 2017 11:24 PM, Franklin S Cooper Jr wrote:
> 66AK2G has I2C instances that are not apart of the ALWAYS_ON power domain
> like other Keystone 2 SoCs and OMAPL138. Therefore, pm_runtime

unlike ?

> is required to insure the power domain used by the specific I2C instance is
> properly turned on along with its functional clock.
>
> Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
> ---
> Version 3 changes:
> Remove several statements that set clk to NULL
> Fix error path
>
> drivers/i2c/busses/i2c-davinci.c | 64 +++++++++++++++++++++++++++++++++-------
> 1 file changed, 53 insertions(+), 11 deletions(-)

> @@ -802,12 +821,22 @@ static int davinci_i2c_probe(struct platform_device *pdev)
> dev->clk = devm_clk_get(&pdev->dev, NULL);
> if (IS_ERR(dev->clk))
> return PTR_ERR(dev->clk);
> - clk_prepare_enable(dev->clk);
>
> mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> dev->base = devm_ioremap_resource(&pdev->dev, mem);
> if (IS_ERR(dev->base)) {
> - r = PTR_ERR(dev->base);
> + return PTR_ERR(dev->base);
> + }
> +
> + pm_runtime_set_autosuspend_delay(dev->dev,
> + DAVINCI_I2C_PM_TIMEOUT);
> + pm_runtime_use_autosuspend(dev->dev);
> +
> + pm_runtime_enable(dev->dev);
> +
> + r = pm_runtime_get_sync(dev->dev);
> + if (r < 0) {
> + dev_err(dev->dev, "failed to runtime_get device: %d\n", r);
> goto err_unuse_clocks;

You end up doing a pm_runtime_put_sync() on failure here, instead of
pm_runtime_put_noidle() like rest of the patch.

May be handle this failure here instead of relying on the goto path.

> }
>
> @@ -849,27 +878,40 @@ static int davinci_i2c_probe(struct platform_device *pdev)
> if (r)
> goto err_unuse_clocks;
>
> + pm_runtime_mark_last_busy(dev->dev);
> + pm_runtime_put_autosuspend(dev->dev);
> +
> return 0;
>
> err_unuse_clocks:
> - clk_disable_unprepare(dev->clk);
> - dev->clk = NULL;
> + pm_runtime_dont_use_autosuspend(dev->dev);
> + pm_runtime_put_sync(dev->dev);
> + pm_runtime_disable(dev->dev);
> +
> return r;
> }

Thanks,
Sekhar

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