Re: [PATCH V4 02/18] pinctrl: tegra: add suspend and resume support

[Sowjanya Komatineni]

On 6/24/19 2:46 AM, Dmitry Osipenko wrote:
> 24.06.2019 6:02, Sowjanya Komatineni ÐÐÑÐÑ:
> > This patch adds support for Tegra pinctrl driver suspend and resume.
> >
> > During suspend, context of all pinctrl registers are stored and
> > on resume they are all restored to have all the pinmux and pad
> > configuration for normal operation.
> >
> > Signed-off-by: Sowjanya Komatineni <skomatineni@xxxxxxxxxx>
> > ---
> >   drivers/pinctrl/tegra/pinctrl-tegra.c    | 47 ++++++++++++++++++++++++++++++++
> >   drivers/pinctrl/tegra/pinctrl-tegra.h    |  4 +++
> >   drivers/pinctrl/tegra/pinctrl-tegra210.c |  6 ++++
> >   3 files changed, 57 insertions(+)
> >
> > diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c
> > index b03c465917b8..c0ba6fa63ad1 100644
> > --- a/drivers/pinctrl/tegra/pinctrl-tegra.c
> > +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c
> > @@ -631,6 +631,38 @@ static void tegra_pinctrl_clear_parked_bits(struct tegra_pmx *pmx)
> >   	}
> >   }
> >   
> > +int __maybe_unused tegra_pinctrl_suspend(struct device *dev)
> The "maybe_unused" attribute isn't needed for global functions because
> compiler always assumes that such functions are used somewhere outside.
Will fix this in V5
> > +{
> > +	struct tegra_pmx *pmx = dev_get_drvdata(dev);
> > +	u32 *backup_regs = pmx->backup_regs;
> > +	u32 *regs;
> > +	unsigned int i, j;
> > +
> > +	for (i = 0; i < pmx->nbanks; i++) {
> > +		regs = pmx->regs[i];
> > +		for (j = 0; j < pmx->reg_bank_size[i] / 4; j++)
> > +			*backup_regs++ = readl(regs++);
> > +	}
> > +
> > +	return pinctrl_force_sleep(pmx->pctl);
> > +}
> > +
> > +int __maybe_unused tegra_pinctrl_resume(struct device *dev)
> > +{
> > +	struct tegra_pmx *pmx = dev_get_drvdata(dev);
> > +	u32 *backup_regs = pmx->backup_regs;
> > +	u32 *regs;
> > +	unsigned int i, j;
> > +
> > +	for (i = 0; i < pmx->nbanks; i++) {
> > +		regs = pmx->regs[i];
> > +		for (j = 0; j < pmx->reg_bank_size[i] / 4; j++)
> > +			writel(*backup_regs++, regs++);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >   static bool gpio_node_has_range(const char *compatible)
> >   {
> >   	struct device_node *np;
> > @@ -655,6 +687,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
> >   	int i;
> >   	const char **group_pins;
> >   	int fn, gn, gfn;
> > +	unsigned long backup_regs_size = 0;
> >   
> >   	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
> >   	if (!pmx)
> > @@ -707,6 +740,7 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
> >   		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
> >   		if (!res)
> >   			break;
> > +		backup_regs_size += resource_size(res);
> >   	}
> >   	pmx->nbanks = i;
> >   
> > @@ -715,11 +749,24 @@ int tegra_pinctrl_probe(struct platform_device *pdev,
> >   	if (!pmx->regs)
> >   		return -ENOMEM;
> >   
> > +	pmx->reg_bank_size = devm_kcalloc(&pdev->dev, pmx->nbanks,
> > +					  sizeof(*pmx->reg_bank_size),
> > +					  GFP_KERNEL);
> > +	if (!pmx->reg_bank_size)
> > +		return -ENOMEM;
> > +
> > +	pmx->backup_regs = devm_kzalloc(&pdev->dev, backup_regs_size,
> > +					GFP_KERNEL);
> > +	if (!pmx->backup_regs)
> > +		return -ENOMEM;
> > +
> >   	for (i = 0; i < pmx->nbanks; i++) {
> >   		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
> >   		pmx->regs[i] = devm_ioremap_resource(&pdev->dev, res);
> >   		if (IS_ERR(pmx->regs[i]))
> >   			return PTR_ERR(pmx->regs[i]);
> > +
> > +		pmx->reg_bank_size[i] = resource_size(res);
> >   	}
> >   
> >   	pmx->pctl = devm_pinctrl_register(&pdev->dev, &tegra_pinctrl_desc, pmx);
> > diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.h b/drivers/pinctrl/tegra/pinctrl-tegra.h
> > index 32642af3f871..65fcbf8c7579 100644
> > --- a/drivers/pinctrl/tegra/pinctrl-tegra.h
> > +++ b/drivers/pinctrl/tegra/pinctrl-tegra.h
> > @@ -17,6 +17,8 @@ struct tegra_pmx {
> >   
> >   	int nbanks;
> >   	void __iomem **regs;
> > +	size_t *reg_bank_size;
> > +	u32 *backup_regs;
> >   };
> >   
> >   enum tegra_pinconf_param {
> > @@ -195,4 +197,6 @@ struct tegra_pinctrl_soc_data {
> >   
> >   int tegra_pinctrl_probe(struct platform_device *pdev,
> >   			const struct tegra_pinctrl_soc_data *soc_data);
> > +int __maybe_unused tegra_pinctrl_suspend(struct device *dev);
> > +int __maybe_unused tegra_pinctrl_resume(struct device *dev);
> >   #endif
> > diff --git a/drivers/pinctrl/tegra/pinctrl-tegra210.c b/drivers/pinctrl/tegra/pinctrl-tegra210.c
> > index 617ad963f5ad..4616bbc2efba 100644
> > --- a/drivers/pinctrl/tegra/pinctrl-tegra210.c
> > +++ b/drivers/pinctrl/tegra/pinctrl-tegra210.c
> > @@ -1562,6 +1562,11 @@ static int tegra210_pinctrl_probe(struct platform_device *pdev)
> >   	return tegra_pinctrl_probe(pdev, &tegra210_pinctrl);
> >   }
> >   
> > +static const struct dev_pm_ops tegra_pinctrl_pm = {
> > +	.suspend = &tegra_pinctrl_suspend,
> > +	.resume = &tegra_pinctrl_resume
> > +};
> What about to move tegra_pinctrl_pm out into pinctrl-tegra.c to make it
> common for all of the drivers?
OK, Will do that in V5