linux-kernel - Re: [PATCH v3 1/2] usb: ulpi: defer ulpi_register on ulpi_read

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Date:   Fri, 18 Nov 2022 12:31:49 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Ferry Toth <ftoth@...londelft.nl>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        Sean Anderson <sean.anderson@...o.com>,
        Liu Shixin <liushixin2@...wei.com>,
        Ferry Toth <fntoth@...il.com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 1/2] usb: ulpi: defer ulpi_register on ulpi_read_id
 timeout

On Thu, Nov 17, 2022 at 09:54:10PM +0100, Ferry Toth wrote:
> Since commit 0f010171
> Dual Role support on Intel Merrifield platform broke due to rearranging
> the call to dwc3_get_extcon().

Not sure why format is broken, you may add into your ~/.gitconfig

	[core]
		abbrev = 12

	[alias]
		one = show -s --pretty='format:%h (\"%s\")'

and run

	git one 0f010171

with the result

	0f0101719138 ("usb: dwc3: Don't switch OTG -> peripheral if extcon is present")

> It appears to be caused by ulpi_read_id() on the first test write failing
> with -ETIMEDOUT. Currently ulpi_read_id() expects to discover the phy via
> DT when the test write fails and returns 0 in that case even if DT does not
> provide the phy. As a result usb probe completes without phy.


-- 
With Best Regards,
Andy Shevchenko