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: <[email protected]> # 4.7+ Reported-by: Marek Szyprowski <[email protected]> Signed-off-by: Sylwester Nawrocki <[email protected]> --- 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 + * used in probe() handler of clients of this adapter so there is + * no issues with clearing the flag right after registering the I2C + * adapter. + */ + pm_suspend_ignore_children(&i2c_adap->dev, false); return 0; + +err_pm_dis: + pm_runtime_disable(&pdev->dev); + return ret; } static int fimc_is_i2c_remove(struct platform_device *pdev) { struct fimc_is_i2c *isp_i2c = platform_get_drvdata(pdev); - pm_runtime_disable(&isp_i2c->adapter.dev); pm_runtime_disable(&pdev->dev); i2c_del_adapter(&isp_i2c->adapter); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
