Re: [PATCH v13 16/35] usb: chipidea: tegra: Add runtime PM and OPP support

Peter Chen
2021-09-30T14:06:44Z

On 21-09-27 01:40:39, Dmitry Osipenko wrote:
> The Tegra USB controller belongs to the core power domain and we're going
> to enable GENPD support for the core domain. Now USB controller must be
> resumed using runtime PM API in order to initialize the USB power state.
> We already support runtime PM for the CI device, but CI's PM is separated
> from the RPM managed by tegra-usb driver. Add runtime PM and OPP support
> to the driver.
>
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> ---
> drivers/usb/chipidea/ci_hdrc_tegra.c | 53 ++++++++++++++++++++++++----
> 1 file changed, 46 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
> index 60361141ac04..3142ef7ebe42 100644
> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> @@ -7,6 +7,7 @@
> #include <linux/io.h>
> #include <linux/module.h>
> #include <linux/of_device.h>
> +#include <linux/pm_runtime.h>
> #include <linux/reset.h>
>
> #include <linux/usb.h>
> @@ -15,6 +16,8 @@
> #include <linux/usb/of.h>
> #include <linux/usb/phy.h>
>
> +#include <soc/tegra/common.h>
> +
> #include "../host/ehci.h"
>
> #include "ci.h"
> @@ -278,6 +281,8 @@ static int tegra_usb_probe(struct platform_device *pdev)
> if (!usb)
> return -ENOMEM;
>
> + platform_set_drvdata(pdev, usb);
> +
> soc = of_device_get_match_data(&pdev->dev);
> if (!soc) {
> dev_err(&pdev->dev, "failed to match OF data\n");
> @@ -296,11 +301,17 @@ static int tegra_usb_probe(struct platform_device *pdev)
> return err;
> }
>
> - err = clk_prepare_enable(usb->clk);
> - if (err < 0) {
> - dev_err(&pdev->dev, "failed to enable clock: %d\n", err);
> + err = devm_pm_runtime_enable(&pdev->dev);
> + if (err)
> + return err;
> +
> + err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);
> + if (err)
> + return err;
> +
> + err = pm_runtime_resume_and_get(&pdev->dev);
> + if (err)
> return err;
> - }
>
> if (device_property_present(&pdev->dev, "nvidia,needs-double-reset"))
> usb->needs_double_reset = true;
> @@ -320,8 +331,6 @@ static int tegra_usb_probe(struct platform_device *pdev)
> if (err)
> goto fail_power_off;
>
> - platform_set_drvdata(pdev, usb);
> -
> /* setup and register ChipIdea HDRC device */
> usb->soc = soc;
> usb->data.name = "tegra-usb";
> @@ -350,7 +359,8 @@ static int tegra_usb_probe(struct platform_device *pdev)
> phy_shutdown:
> usb_phy_shutdown(usb->phy);
> fail_power_off:
> - clk_disable_unprepare(usb->clk);
> + pm_runtime_put(&pdev->dev);
> +
> return err;
> }
>
> @@ -360,15 +370,44 @@ static int tegra_usb_remove(struct platform_device *pdev)
>
> ci_hdrc_remove_device(usb->dev);
> usb_phy_shutdown(usb->phy);
> + pm_runtime_put(&pdev->dev);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused tegra_usb_runtime_resume(struct device *dev)
> +{
> + struct tegra_usb *usb = dev_get_drvdata(dev);
> + int err;
> +
> + err = clk_prepare_enable(usb->clk);
> + if (err < 0) {
> + dev_err(dev, "failed to enable clock: %d\n", err);
> + return err;
> + }
> +
> + return 0;
> +}
> +
> +static int __maybe_unused tegra_usb_runtime_suspend(struct device *dev)
> +{
> + struct tegra_usb *usb = dev_get_drvdata(dev);
> +
> clk_disable_unprepare(usb->clk);
>
> return 0;
> }
>
> +static const struct dev_pm_ops tegra_usb_pm = {
> + SET_RUNTIME_PM_OPS(tegra_usb_runtime_suspend, tegra_usb_runtime_resume,
> + NULL)
> +};
> +
> static struct platform_driver tegra_usb_driver = {
> .driver = {
> .name = "tegra-usb",
> .of_match_table = tegra_usb_of_match,
> + .pm = &tegra_usb_pm,
> },
> .probe = tegra_usb_probe,
> .remove = tegra_usb_remove,
> --
> 2.32.0
>

I got below compile error if only compile this file, I think previous patches
should include the definition, if that, feel free to add my ack to this
patch.

Acked-by: Peter Chen <peter.chen@kernel.org>

drivers/usb/chipidea/ci_hdrc_tegra.c:308:8: error: implicit declaration of function ‘devm_tegra_core_dev_init_opp_table_common’;
did you mean ‘devm_tegra_core_dev_init_opp_table’? [-Werror=implicit-function-declaration]
308 | err = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| devm_tegra_core_dev_init_opp_table

--

Thanks,
Peter Chen