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

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Date:   Wed, 21 Jul 2021 10:08:18 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Claudiu Beznea <claudiu.beznea@...rochip.com>
Cc:     stern@...land.harvard.edu, 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 09, 2021 at 03:10:27PM +0300, Claudiu Beznea wrote:
> On SAMA7G5 suspending ports will cut the access to OHCI registers and
> any subsequent access to them will lead to CPU being blocked trying to
> access that memory. Same thing happens on resume: if OHCI memory is
> accessed before resuming ports the CPU will block on that access. The
> OCHI memory is accessed on suspend/resume though
> ohci_suspend()/ohci_resume().
> 
> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
> ---
> 
> The patch was tested on SAMA7G5, SAMA5D2 and SAM9X60.

This does not apply to 5.14-rc2, can you please rebase and resend?

thanks,

greg k-h