linux-kernel - Re: [PATCH 5/9] usb: xhci-pci: Add support for reset controllers

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Date:   Tue, 09 Jun 2020 13:18:38 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Florian Fainelli <f.fainelli@...il.com>,
        gregkh@...uxfoundation.org, wahrenst@....net, robh@...nel.org,
        mathias.nyman@...ux.intel.com, Eric Anholt <eric@...olt.net>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-usb@...r.kernel.org,
        Mathias Nyman <mathias.nyman@...el.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     lorenzo.pieralisi@....com, tim.gover@...pberrypi.org,
        helgaas@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] usb: xhci-pci: Add support for reset controllers

Hi Florian, thanks for the reviews!

On Mon, 2020-06-08 at 12:43 -0700, Florian Fainelli wrote:
> 
> On 6/8/2020 12:26 PM, Nicolas Saenz Julienne wrote:
> > Some atypical users of xhci-pci might need to manually reset their xHCI
> > controller before starting the HCD setup. Check if a reset controller
> > device is available to the PCI bus and trigger a reset.
> > 
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > ---
> >  drivers/usb/host/xhci-pci.c | 9 +++++++++
> >  1 file changed, 9 insertions(+)
> > 
> > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > index ef513c2fb843..45f70facdfcd 100644
> > --- a/drivers/usb/host/xhci-pci.c
> > +++ b/drivers/usb/host/xhci-pci.c
> > @@ -12,6 +12,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/module.h>
> >  #include <linux/acpi.h>
> > +#include <linux/reset.h>
> >  
> >  #include "xhci.h"
> >  #include "xhci-trace.h"
> > @@ -339,6 +340,7 @@ static int xhci_pci_probe(struct pci_dev *dev, const
> > struct pci_device_id *id)
> >  	struct xhci_hcd *xhci;
> >  	struct usb_hcd *hcd;
> >  	struct xhci_driver_data *driver_data;
> > +	struct reset_control *reset;
> >  
> >  	driver_data = (struct xhci_driver_data *)id->driver_data;
> >  	if (driver_data && driver_data->quirks & XHCI_RENESAS_FW_QUIRK) {
> > @@ -347,6 +349,13 @@ static int xhci_pci_probe(struct pci_dev *dev, const
> > struct pci_device_id *id)
> >  			return retval;
> >  	}
> >  
> > +	reset = devm_reset_control_get(&dev->bus->dev, NULL);
> 
> Should not this be devm_reset_control_get_optional()?

Yes, you're right.

Regards,
Nicolas

> > +	if (IS_ERR(reset)) {
> > +		retval = PTR_ERR(reset);
> > +		return retval;
> > +	}
> > +	reset_control_reset(reset);
> > +
> >  	/* Prevent runtime suspending between USB-2 and USB-3 initialization */
> >  	pm_runtime_get_noresume(&dev->dev);
> >  
> > 


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