From 056c61eb0da4d7181fc7072567dc1931cb0e1cbb Mon Sep 17 00:00:00 2001 From: Sylwester Nawrocki Date: Tue, 13 Sep 2016 11:39:33 -0300 Subject: [PATCH] [media] exynos4-is: Clear isp-i2c adapter power.ignore_children flag 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. This patch is meant as a minimal change to fix the regression, eventually the I2C_ISPx clock handling will be moved to the top level fimc-is driver and whole runtime PM code is going to be dropped from the fimc-is-i2c module. Cc: # 4.7+ Reported-by: Marek Szyprowski Signed-off-by: Sylwester Nawrocki Reviewed-by: Bartlomiej Zolnierkiewicz Signed-off-by: Mauro Carvalho Chehab --- drivers/media/platform/exynos4-is/fimc-is-i2c.c | 24 +++++++++++++++++------- 1 file changed, 17 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 fd888ef..6bba4ca 100644 --- a/drivers/media/platform/exynos4-is/fimc-is-i2c.c +++ b/drivers/media/platform/exynos4-is/fimc-is-i2c.c @@ -55,23 +55,33 @@ static int fimc_is_i2c_probe(struct platform_device *pdev) i2c_adap->algo = &fimc_is_i2c_algorithm; i2c_adap->class = I2C_CLASS_SPD; - ret = i2c_add_adapter(i2c_adap); - if (ret < 0) - return ret; - platform_set_drvdata(pdev, isp_i2c); - pm_runtime_enable(&pdev->dev); - pm_runtime_enable(&i2c_adap->dev); + ret = i2c_add_adapter(i2c_adap); + if (ret < 0) + goto err_pm_dis; + /* + * 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); -- 2.7.4