Re: [PATCH v1 2/4] usb: phy: tegra: Hook up init/shutdown callbacks

Dmitry Osipenko
2019-12-19T15:24:59Z

19.12.2019 09:56, Peter Chen пишет:
> On 19-12-18 20:53:11, Dmitry Osipenko wrote:
>> Generic PHY provides init/shutdown callbacks which allow USB-host drivers
>> to abstract PHY's hardware management in a common way. This change allows
>> to remove Tegra-specific PHY handling from the ChipIdea driver.
>>
>> Note that ChipIdea's driver shall be changed at the same time because it
>> turns PHY ON without the PHY's initialization and this doesn't work now,
>> resulting in a NULL dereference of phy->freq because it's set during of
>> the PHY's initialization.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
>> ---
>> drivers/usb/chipidea/ci_hdrc_tegra.c | 9 --
>> drivers/usb/phy/phy-tegra-usb.c | 165 +++++++++++++++++----------
>> 2 files changed, 102 insertions(+), 72 deletions(-)
>>
>> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
>> index 0c9911d44ee5..7455df0ede49 100644
>> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
>> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
>> @@ -83,13 +83,6 @@ static int tegra_udc_probe(struct platform_device *pdev)
>> return err;
>> }
>>
>> - /*
>> - * Tegra's USB PHY driver doesn't implement optional phy_init()
>> - * hook, so we have to power on UDC controller before ChipIdea
>> - * driver initialization kicks in.
>> - */
>> - usb_phy_set_suspend(udc->phy, 0);
>> -
>> /* setup and register ChipIdea HDRC device */
>> udc->data.name = "tegra-udc";
>> udc->data.flags = soc->flags;
>> @@ -109,7 +102,6 @@ static int tegra_udc_probe(struct platform_device *pdev)
>> return 0;
>>
>> fail_power_off:
>> - usb_phy_set_suspend(udc->phy, 1);
>> clk_disable_unprepare(udc->clk);
>> return err;
>> }
>> @@ -119,7 +111,6 @@ static int tegra_udc_remove(struct platform_device *pdev)
>> struct tegra_udc *udc = platform_get_drvdata(pdev);
>>
>> ci_hdrc_remove_device(udc->dev);
>> - usb_phy_set_suspend(udc->phy, 1);
>> clk_disable_unprepare(udc->clk);
>>
>> return 0;
>> diff --git a/drivers/usb/phy/phy-tegra-usb.c b/drivers/usb/phy/phy-tegra-usb.c
>> index ea7ef1dc0b42..15bd253d53c9 100644
>> --- a/drivers/usb/phy/phy-tegra-usb.c
>> +++ b/drivers/usb/phy/phy-tegra-usb.c
>> @@ -238,23 +238,6 @@ static int utmip_pad_open(struct tegra_usb_phy *phy)
>> {
>> int ret;
>>
>> - phy->pad_clk = devm_clk_get(phy->u_phy.dev, "utmi-pads");
>> - if (IS_ERR(phy->pad_clk)) {
>> - ret = PTR_ERR(phy->pad_clk);
>> - dev_err(phy->u_phy.dev,
>> - "Failed to get UTMIP pad clock: %d\n", ret);
>> - return ret;
>> - }
>> -
>> - phy->pad_rst = devm_reset_control_get_optional_shared(
>> - phy->u_phy.dev, "utmi-pads");
>> - if (IS_ERR(phy->pad_rst)) {
>> - ret = PTR_ERR(phy->pad_rst);
>> - dev_err(phy->u_phy.dev,
>> - "Failed to get UTMI-pads reset: %d\n", ret);
>> - return ret;
>> - }
>> -
>> ret = clk_prepare_enable(phy->pad_clk);
>> if (ret) {
>> dev_err(phy->u_phy.dev,
>> @@ -315,6 +298,18 @@ static int utmip_pad_close(struct tegra_usb_phy *phy)
>> return ret;
>> }
>
> Acked-by: Peter Chen <peter.chen@nxp.com>
>
> Felipe, would you please queue this series after reviewing for USB PHY
> changes? If not, Dmitry may need to split the patch.

I'll take a closer look whether it is possible to factor out ChipIdea's
driver change into a separate patch in a sensible way. Thanks!