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

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Date:   Thu, 17 Dec 2020 16:02:27 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Dmitry Osipenko <digetx@...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

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.

Thierry

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