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Date: Thu, 6 Jun 2019 06:58:53 -0700 From: Bitan Biswas <bbiswas@...dia.com> To: Dmitry Osipenko <digetx@...il.com>, 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> CC: Shardar Mohammed <smohammed@...dia.com>, Sowjanya Komatineni <skomatineni@...dia.com>, Mantravadi Karthik <mkarthik@...dia.com> Subject: Re: [PATCH V2] i2c: busses: tegra: Add suspend-resume support On 6/6/19 5:06 AM, Dmitry Osipenko wrote: > 06.06.2019 8:54, Bitan Biswas пишет: >> 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> >> --- >> drivers/i2c/busses/i2c-tegra.c | 23 +++++++++++++++++++++++ >> 1 file changed, 23 insertions(+) >> >> diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c >> index ebaa78d..76b7926 100644 >> --- a/drivers/i2c/busses/i2c-tegra.c >> +++ b/drivers/i2c/busses/i2c-tegra.c >> @@ -1687,7 +1687,30 @@ static int tegra_i2c_remove(struct platform_device *pdev) >> } >> >> #ifdef CONFIG_PM_SLEEP >> +static int tegra_i2c_suspend(struct device *dev) >> +{ >> + struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev); >> + >> + i2c_mark_adapter_suspended(&i2c_dev->adapter); >> + >> + return 0; >> +} >> + >> +static int tegra_i2c_resume(struct device *dev) >> +{ >> + struct tegra_i2c_dev *i2c_dev = dev_get_drvdata(dev); >> + int ret; >> + >> + ret = tegra_i2c_init(i2c_dev, false); >> + if (ret) >> + return ret; > > We're expecting that tegra_i2c_init returns a error code on a failure > and nothing else, hence it will be a bit more expressive to name the > returned variable as "err". There is nothing wrong with yours variant, > this is just a very minor recommendation from me. Please note that a bit > more wise choice of the names makes easier to follow the code for other > people and hence results in a cleaner code. Agreed. > >> + >> + i2c_mark_adapter_resumed(&i2c_dev->adapter); > > Please add a blank line here for a better readability and to make the > patch consistent. You added the blank line in a similar case of > tegra_i2c_suspend() and this makes it inconsistent. > OK. >> + return 0; >> +} >> + >> static const struct dev_pm_ops tegra_i2c_pm = { >> + SET_SYSTEM_SLEEP_PM_OPS(tegra_i2c_suspend, tegra_i2c_resume) >> SET_RUNTIME_PM_OPS(tegra_i2c_runtime_suspend, tegra_i2c_runtime_resume, >> NULL) >> }; >> I shall send updated patch with suggested changes. -thanks, Bitan
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