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

Dmitry Osipenko
2019-06-24T09:46:35Z

24.06.2019 6:02, Sowjanya Komatineni пишет:
> 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@nvidia.com>
> ---
> 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.

> +{
> + 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?