Re: [PATCH V3] i2c: busses: tegra: Add suspend-resume support

[Bitan Biswas]

On 6/14/19 2:11 PM, Wolfram Sang wrote:
> On Thu, Jun 06, 2019 at 10:37:47PM -0700, Bitan Biswas wrote:
> > Post suspend I2C registers have power on reset values. Before any
> > transfer initialize I2C registers to prevent I2C transfer timeout
> > and implement suspend and resume callbacks needed. Fix below errors
> > post suspend:
> >
> > 1) Tegra I2C transfer timeout during jetson tx2 resume:
> >
> > [   27.520613] pca953x 1-0074: calling pca953x_resume+0x0/0x1b0 @ 2939, parent: i2c-1
> > [   27.633623] tegra-i2c 3160000.i2c: i2c transfer timed out
> > [   27.639162] pca953x 1-0074: Unable to sync registers 0x3-0x5. -110
> > [   27.645336] pca953x 1-0074: Failed to sync GPIO dir registers: -110
> > [   27.651596] PM: dpm_run_callback(): pca953x_resume+0x0/0x1b0 returns -110
> > [   27.658375] pca953x 1-0074: pca953x_resume+0x0/0x1b0 returned -110 after 127152 usecs
> > [   27.666194] PM: Device 1-0074 failed to resume: error -110
> >
> > 2) Tegra I2C transfer timeout error on jetson Xavier post resume.
> >
> > Remove i2c bus lock-unlock calls in resume callback as i2c_mark_adapter_*
> > (suspended-resumed) help ensure i2c core calls from client are not
> > executed before i2c-tegra resume.
> >
> > Signed-off-by: Bitan Biswas <bbiswas@xxxxxxxxxx>
>
> Applied to for-next, thanks!
>
> Without a maintainer ack, this is an exception this time. Should we add
> Dmitry as another maintainer or reviewer at least?
I shall followup with Maintainer for ACK in future I2C tegra patches. 
Probably maintainers or reviewers should comment here.