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SubjectRe: [PATCH 1/2] i2c: designware: switch to suspend_late/resume_early
On Wed, Sep 20, 2017 at 3:31 PM, Rajat Jain <rajatja@google.com> wrote:
> Ref: https://lkml.org/lkml/2017/9/19/649
>
> The bus controllers should suspend the bus operations only after
> all of the devices on the bus have suspended their device
> completely. Since the i2c_client drivers could be talking to
> their devices in their suspend_late() calls, lets ensure that the
> bus is alive by that time. Thus moving the controller suspend logic to
> suspend_late().
>
> Signed-off-by: Rajat Jain <rajatja@google.com>
> ---

Forgot to mention, this was needed because we were seeing problems
when the ACPI routines (called at resume_early() time) for the i2c
client device were trying to access one of the I2C devices, and were
failing because the bus was not ready.

Thanks,

Rajat


> drivers/i2c/busses/i2c-designware-platdrv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
> index 0e65b97842b4..66dd7f844c40 100644
> --- a/drivers/i2c/busses/i2c-designware-platdrv.c
> +++ b/drivers/i2c/busses/i2c-designware-platdrv.c
> @@ -468,7 +468,7 @@ static int dw_i2c_plat_suspend(struct device *dev)
> static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
> .prepare = dw_i2c_plat_prepare,
> .complete = dw_i2c_plat_complete,
> - SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
> + SET_LATE_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
> SET_RUNTIME_PM_OPS(dw_i2c_plat_runtime_suspend,
> dw_i2c_plat_resume,
> NULL)
> --
> 2.14.1.821.g8fa685d3b7-goog
>

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