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

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Date:   Wed, 23 Jun 2021 14:33:14 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <stern@...land.harvard.edu>
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 23.06.2021 17:19, Alan Stern wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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.

Agree with all the above!

> 
> Alan Stern
>