linux-kernel - Re: [PATCH 8/8] phy: add driver for TI TUSB1210 ULPI PHY

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Message-ID: <20150213220357.GK26980@saruman.tx.rr.com>
Date:	Fri, 13 Feb 2015 16:03:57 -0600
From:	Felipe Balbi <balbi@...com>
To:	David Cohen <david.a.cohen@...ux.intel.com>
CC:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Baolu Lu <baolu.lu@...ux.intel.com>,
	<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH 8/8] phy: add driver for TI TUSB1210 ULPI PHY

On Fri, Feb 13, 2015 at 02:02:11PM -0800, David Cohen wrote:
> Hi Felipe,
> 
> [snip]
> 
> > diff --git a/drivers/usb/dwc3/dwc3-pci.c b/drivers/usb/dwc3/dwc3-pci.c
> > index 8d95056..53902ea 100644
> > --- a/drivers/usb/dwc3/dwc3-pci.c
> > +++ b/drivers/usb/dwc3/dwc3-pci.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/slab.h>
> >  #include <linux/pci.h>
> >  #include <linux/platform_device.h>
> > +#include <linux/gpio/consumer.h>
> >  
> >  #include "platform_data.h"
> >  
> > @@ -35,6 +36,24 @@
> >  
> >  static int dwc3_pci_quirks(struct pci_dev *pdev)
> >  {
> > +	if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
> > +	    pdev->device == PCI_DEVICE_ID_INTEL_BYT) {
> > +		struct gpio_desc *gpio;
> > +
> > +		gpio = gpiod_get_index(&pdev->dev, "reset", 0);
> > +		if (!IS_ERR(gpio)) {
> > +			gpiod_direction_output(gpio, 0);
> > +			gpiod_set_value_cansleep(gpio, 1);
> > +			gpiod_put(gpio);
> > +		}
> > +		gpio = gpiod_get_index(&pdev->dev, "cs", 1);
> > +		if (!IS_ERR(gpio)) {
> > +			gpiod_direction_output(gpio, 0);
> > +			gpiod_set_value_cansleep(gpio, 1);
> > +			gpiod_put(gpio);
> > +		}
> > +	}
> > +
> 
> A lot has been discussed in other branches of this thread.
> 
> But in resume, this is the last open point to make Heikki's proposal
> good on my side. If you accept this ugly quirk (but necessary for
> current BYT-CR products when ULPI bus enumerates phy), everything seems
> good to me. If you don't accept, we need to figure out a way to get the
> platform driver code back to give gpio to phy as platform data in a way
> that it could live together with ULPI bus (BYT-CR needs the ULPI bus too).

Is this needed to *all* Baytrail devices or could we have devices with
updated firmware which won't need this ? I wonder if we should apply the
quirk for each known product that actually needs this.

Also, I will only accept the series, after I'm shown logs that it works
with your known-to-be-broken device.

cheers

-- 
balbi

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