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Date: Mon, 24 Jun 2019 10:34:13 -0700
From: Sowjanya Komatineni <skomatineni@...dia.com>
To: Dmitry Osipenko <digetx@...il.com>, <thierry.reding@...il.com>,
<jonathanh@...dia.com>, <tglx@...utronix.de>,
<jason@...edaemon.net>, <marc.zyngier@....com>,
<linus.walleij@...aro.org>, <stefan@...er.ch>,
<mark.rutland@....com>
CC: <pdeschrijver@...dia.com>, <pgaikwad@...dia.com>,
<sboyd@...nel.org>, <linux-clk@...r.kernel.org>,
<linux-gpio@...r.kernel.org>, <jckuo@...dia.com>,
<josephl@...dia.com>, <talho@...dia.com>,
<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<mperttunen@...dia.com>, <spatra@...dia.com>, <robh+dt@...nel.org>,
<devicetree@...r.kernel.org>
Subject: Re: [PATCH V4 02/18] pinctrl: tegra: add suspend and resume support
On 6/24/19 2:46 AM, Dmitry Osipenko wrote:
> 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@...dia.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.
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
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