linux-kernel - Re: [PATCH v2 6/8] usb: chipidea: tegra: Support runtime PM

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Date:   Thu, 17 Dec 2020 22:51:10 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Jonathan Hunter <jonathanh@...dia.com>,
        Peter Chen <Peter.Chen@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Felipe Balbi <balbi@...nel.org>,
        Matt Merhar <mattmerhar@...tonmail.com>,
        Nicolas Chauvet <kwizart@...il.com>,
        Peter Geis <pgwipeout@...il.com>,
        Ion Agorria <ion@...rria.com>, linux-tegra@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/8] usb: chipidea: tegra: Support runtime PM

17.12.2020 18:02, Thierry Reding пишет:
> On Thu, Dec 17, 2020 at 04:45:03PM +0300, Dmitry Osipenko wrote:
>> 17.12.2020 16:41, Thierry Reding пишет:
>>> On Thu, Dec 17, 2020 at 12:40:05PM +0300, Dmitry Osipenko wrote:
>>>> Tegra PHY driver now supports waking up controller from a low power mode.
>>>> Enable runtime PM in order to put controller into the LPM during idle.
>>>>
>>>> Tested-by: Matt Merhar <mattmerhar@...tonmail.com>
>>>> Tested-by: Nicolas Chauvet <kwizart@...il.com>
>>>> Tested-by: Peter Geis <pgwipeout@...il.com>
>>>> Tested-by: Ion Agorria <ion@...rria.com>
>>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>>> ---
>>>>  drivers/usb/chipidea/ci_hdrc_tegra.c | 13 ++++++++++---
>>>>  1 file changed, 10 insertions(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/usb/chipidea/ci_hdrc_tegra.c b/drivers/usb/chipidea/ci_hdrc_tegra.c
>>>> index 5fccdeeefc64..655671159511 100644
>>>> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
>>>> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
>>>> @@ -38,21 +38,24 @@ struct tegra_usb_soc_info {
>>>>  
>>>>  static const struct tegra_usb_soc_info tegra20_ehci_soc_info = {
>>>>  	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
>>>> -		 CI_HDRC_OVERRIDE_PHY_CONTROL,
>>>> +		 CI_HDRC_OVERRIDE_PHY_CONTROL |
>>>> +		 CI_HDRC_SUPPORTS_RUNTIME_PM,
>>>>  	.dr_mode = USB_DR_MODE_HOST,
>>>>  	.txfifothresh = 10,
>>>>  };
>>>>  
>>>>  static const struct tegra_usb_soc_info tegra30_ehci_soc_info = {
>>>>  	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
>>>> -		 CI_HDRC_OVERRIDE_PHY_CONTROL,
>>>> +		 CI_HDRC_OVERRIDE_PHY_CONTROL |
>>>> +		 CI_HDRC_SUPPORTS_RUNTIME_PM,
>>>>  	.dr_mode = USB_DR_MODE_HOST,
>>>>  	.txfifothresh = 16,
>>>>  };
>>>>  
>>>>  static const struct tegra_usb_soc_info tegra_udc_soc_info = {
>>>>  	.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
>>>> -		 CI_HDRC_OVERRIDE_PHY_CONTROL,
>>>> +		 CI_HDRC_OVERRIDE_PHY_CONTROL |
>>>> +		 CI_HDRC_SUPPORTS_RUNTIME_PM,
>>>>  	.dr_mode = USB_DR_MODE_UNKNOWN,
>>>>  };
>>>>  
>>>> @@ -323,6 +326,10 @@ static int tegra_usb_probe(struct platform_device *pdev)
>>>>  	usb->data.hub_control = tegra_ehci_hub_control;
>>>>  	usb->data.notify_event = tegra_usb_notify_event;
>>>>  
>>>> +	/* Tegra PHY driver currently doesn't support LPM for ULPI */
>>>> +	if (of_usb_get_phy_mode(pdev->dev.of_node) == USBPHY_INTERFACE_MODE_ULPI)
>>>> +		usb->data.flags &= ~CI_HDRC_SUPPORTS_RUNTIME_PM;
>>>> +
>>>
>>> Does this prevent the wakeup_enabled from being set for ULPI PHYs?
>>
>> Yes
> 
> Okay, it should be fine then to keep that WARN_ONCE in that prior patch
> since we should really only get there if there's something seriously
> wrong.

Correct, that is the actual intention of the warning.