Hi, On Thursday, September 01, 2016 01:39:16 PM Sylwester Nawrocki wrote: > Since commit 04f59143b571161d25315dd52d7a2ecc022cb71a > ("i2c: let I2C masters ignore their children for PM") > the power.ignore_children flag is set when registering an I2C > adapter. Since I2C transfers are not managed by the fimc-isp-i2c > driver its clients use pm_runtime_* calls directly to communicate > required power state of the bus controller. > However when the power.ignore_children flag is set that doesn't > work, so clear that flag back after registering the adapter. > While at it drop pm_runtime_enable() call on the i2c_adapter > as it is already done by the I2C subsystem when registering > I2C adapter. > > Cc: <stable@xxxxxxxxxxxxxxx> # 4.7+ You may also use "Fixes:" tag to mark the original commit that this one corrects. > Reported-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> > Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx> > --- > drivers/media/platform/exynos4-is/fimc-is-i2c.c | 25 ++++++++++++++++++------- > 1 file changed, 18 insertions(+), 7 deletions(-) > > diff --git a/drivers/media/platform/exynos4-is/fimc-is-i2c.c b/drivers/media/platform/exynos4-is/fimc-is-i2c.c > index 7521aa5..03b4246 100644 > --- a/drivers/media/platform/exynos4-is/fimc-is-i2c.c > +++ b/drivers/media/platform/exynos4-is/fimc-is-i2c.c > @@ -55,26 +55,37 @@ static int fimc_is_i2c_probe(struct platform_device *pdev) > i2c_adap->algo = &fimc_is_i2c_algorithm; > i2c_adap->class = I2C_CLASS_SPD; > > + platform_set_drvdata(pdev, isp_i2c); > + pm_runtime_enable(&pdev->dev); > + > ret = i2c_add_adapter(i2c_adap); > if (ret < 0) { > dev_err(&pdev->dev, "failed to add I2C bus %s\n", > node->full_name); > - return ret; > + goto err_pm_dis; > } > > - platform_set_drvdata(pdev, isp_i2c); > - > - pm_runtime_enable(&pdev->dev); > - pm_runtime_enable(&i2c_adap->dev); > - > + /* > + * Client drivers of this adapter don't do any I2C transfers as that > + * is handled by the ISP firmware. But we rely on the runtime PM > + * state propagation from the clients up to the adapter driver so > + * clear the ignore_children flags here. PM rutnime calls are not Minor nit: "rutnime" typo Otherwise it looks all fine to me. Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx> Best regards, -- Bartlomiej Zolnierkiewicz Samsung R&D Institute Poland Samsung Electronics -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html