iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i2c: qcom-geni: Fix runtime PM mismatch with child devices

Browse Source 
We need to enable runtime PM on this i2c controller before populating
child devices with i2c_add_adapter(). Otherwise, if a child device uses
runtime PM and stays runtime PM enabled we'll get the following warning
at boot.

 Enabling runtime PM for inactive device (a98000.i2c) with active children

[...]

 Call trace:
  pm_runtime_enable+0xd8/0xf8
  geni_i2c_probe+0x440/0x460
  platform_drv_probe+0x74/0xc8
[...]

Let's move the runtime PM enabling and setup to before we add the
adapter, so that this device can respond to runtime PM requests from
children.

Fixes: 37692de5d523 ("i2c: i2c-qcom-geni: Add bus driver for the Qualcomm GENI I2C controller")
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Stephen Boyd 2018-11-02 13:57:32 -07:00 committed by Wolfram Sang
parent 350784e792
commit 848bd3f3de
1 changed files with 8 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/i2c/busses/i2c-qcom-geni.c
View File

@ -571,18 +571,19 @@ static int geni_i2c_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "i2c fifo/se-dma mode. fifo depth:%d\n", tx_depth);
ret = i2c_add_adapter(&gi2c->adap);
if (ret) {
dev_err(&pdev->dev, "Error adding i2c adapter %d\n", ret);
return ret;
}
gi2c->suspended = 1;
pm_runtime_set_suspended(gi2c->se.dev);
pm_runtime_set_autosuspend_delay(gi2c->se.dev, I2C_AUTO_SUSPEND_DELAY);
pm_runtime_use_autosuspend(gi2c->se.dev);
pm_runtime_enable(gi2c->se.dev);
ret = i2c_add_adapter(&gi2c->adap);
if (ret) {
dev_err(&pdev->dev, "Error adding i2c adapter %d\n", ret);
pm_runtime_disable(gi2c->se.dev);
return ret;
}
return 0;
}
@ -590,8 +591,8 @@ static int geni_i2c_remove(struct platform_device *pdev)
{
struct geni_i2c_dev *gi2c = platform_get_drvdata(pdev);
pm_runtime_disable(gi2c->se.dev);
i2c_del_adapter(&gi2c->adap);
pm_runtime_disable(gi2c->se.dev);
return 0;
}