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

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Message-ID: <20190614211129.GG17899@ninjato>
Date:   Fri, 14 Jun 2019 23:11:29 +0200
From:   Wolfram Sang <wsa@...-dreams.de>
To:     Bitan Biswas <bbiswas@...dia.com>
Cc:     Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Shardar Mohammed <smohammed@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Mantravadi Karthik <mkarthik@...dia.com>
Subject: Re: [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@...dia.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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