Re: [PATCH 4/5] xhci-pci: Allow host runtime PM as default for Intel Maple Ridge xHCI

From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org,
	Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: Re: [PATCH 4/5] xhci-pci: Allow host runtime PM as default for Intel Maple Ridge xHCI
Date: Tue, 8 Dec 2020 13:21:09 +0200	[thread overview]
Message-ID: <b93a64e0-bd83-2bf8-9bb3-7e7045c5f26f@linux.intel.com> (raw)
In-Reply-To: <X89JxxWX25kiUsdk@kroah.com>

On 8.12.2020 11.39, Greg KH wrote:
> On Tue, Dec 08, 2020 at 11:29:11AM +0200, Mathias Nyman wrote:
>> From: Mika Westerberg <mika.westerberg@linux.intel.com>
>>
>> Intel Maple Ridge is successor of Titan Ridge Thunderbolt controller. As
>> Titan Ridge this one also includes xHCI host controller. In order to
>> safe energy we should put it to low power state by default when idle.
>> For this reason allow host runtime PM for Maple Ridge.
>>
>> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
>> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
>> ---
>>  drivers/usb/host/xhci-pci.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> Should this be backported to stable kernels too?

I guess that wouldn't hurt. 
Hardware is fresh but distros probably base their releases on older stable kernels.
This would enable xhci runtime pm as default on those as well

Thanks
Mathias