linux-kernel - Re: [PATCH] usb: host: ohci-at91: suspend/resume ports after/before OHCI accesses

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Date:   Wed, 23 Jun 2021 10:19:07 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Claudiu.Beznea@...rochip.com
Cc:     gregkh@...uxfoundation.org, Nicolas.Ferre@...rochip.com,
        alexandre.belloni@...tlin.com, Ludovic.Desroches@...rochip.com,
        Cristian.Birsan@...rochip.com, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: host: ohci-at91: suspend/resume ports after/before
 OHCI accesses

On Wed, Jun 23, 2021 at 02:09:16PM +0000, Claudiu.Beznea@...rochip.com wrote:
> On 23.06.2021 16:59, Alan Stern wrote:
> > One thing you might consider changing: The name of the
> > ohci_at91_port_suspend routine is misleading.  It doesn't really
> > handle suspending the port; instead it handles the clocks that drive
> > the entire OHCI controller.  Right?
> 
> It does both as far as I can tell at the moment.

But the name suggests that it only handles suspending a port.  That's 
misleading.

And the way it is used in the SetPortFeature(USB_PORT_FEAT_SUSPEND) 
case in ohci_at91_hub_control is just plain wrong.  It won't merely 
suspend a single port; it will disable the entire OHCI controller.

Alan Stern