linux-kernel - Re: [PATCH] tty: serial: samsung: Set missing PM ops for hibernation support

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Message-ID: <1dbc24c4-b057-0e71-432a-a7d0ce2df2dc@axis.com>
Date:   Mon, 7 Aug 2023 11:57:04 +0200
From:   Anton Eliasson <anton.eliasson@...s.com>
To:     Andi Shyti <andi.shyti@...nel.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kernel@...s.com>
Subject: Re: [PATCH] tty: serial: samsung: Set missing PM ops for hibernation
 support

On 05/08/2023 23.38, Andi Shyti wrote:
> Hi Anton,
>
> On Thu, Aug 03, 2023 at 01:26:42PM +0200, Anton Eliasson wrote:
>> At least freeze, restore and thaw need to be set in order for the driver
>> to support system hibernation. The existing suspend/resume functions can
>> be reused since those functions don't touch the device's power state or
>> wakeup capability. Use the helper macros SET_SYSTEM_SLEEP_PM_OPS and
>> SET_NOIRQ_SYSTEM_SLEEP_PM_OPS for symmetry with similar drivers.
> and why do we need hibernation in this device?
>
> Andi

Hi!

I wanted to test whether hibernation is possible on our SoC, even though 
it is not a common feature on embedded ARM systems. This is the only 
mainline driver that I found that needed modification, for my 
proof-of-concept anyway, and I couldn't see any harm in the change.


Anton Eliasson