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SubjectRe: [PATCH V3] i2c: busses: tegra: Add suspend-resume support
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@nvidia.com>

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?

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