linux-kernel - Re: [PATCH 1/1] efi: rtc: Enable SET/GET WAKEUP services as optional

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Message-ID: <7608579c-6ee5-f576-aa06-a763c3b6108a@nvidia.com>
Date:   Tue, 3 Jan 2023 10:36:50 -0600
From:   Shanker Donthineni <sdonthineni@...dia.com>
To:     Ard Biesheuvel <ardb@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org
Subject: Re: [PATCH 1/1] efi: rtc: Enable SET/GET WAKEUP services as optional

Hi Ard Biesheuvel,

On 1/3/23 03:18, Ard Biesheuvel wrote:
> External email: Use caution opening links or attachments
> 
> 
> On Mon, 2 Jan 2023 at 23:21, Alexandre Belloni
> <alexandre.belloni@...tlin.com> wrote:
>>
>> On 02/01/2023 11:47:11+0100, Ard Biesheuvel wrote:
>>> On Tue, 27 Dec 2022 at 05:09, Shanker Donthineni <sdonthineni@...dia.com> wrote:
>>>>
>>>> The current implementation of rtc-efi is expecting all the 4
>>>> time services GET{SET}_TIME{WAKEUP} must be supported by UEFI
>>>> firmware. As per the EFI_RT_PROPERTIES_TABLE, the platform
>>>> specific implementations can choose to enable selective time
>>>> services based on the RTC device capabilities.
>>>>
>>>> This patch does the following changes to provide GET/SET RTC
>>>> services on platforms that do not support the WAKEUP feature.
>>>>
>>>> 1) Relax time services cap check when creating a platform device.
>>>> 2) Clear RTC_FEATURE_ALARM bit in the absence of WAKEUP services.
>>>> 3) Conditional alarm entries in '/proc/driver/rtc'.
>>>>
>>>> Signed-off-by: Shanker Donthineni <sdonthineni@...dia.com>
>>>
>>> Queued as a fix in efi/urgent, thanks.
>>
>> This rather seems like an rtc heavy patch and the subject line is
>> misleading. This should be rtc: efi:
>> Also, I'm pretty sure this doesn't qualify as an urgent fix.
>>
> 
> I'm happy to drop it from my tree, but please add a cc:stable so it
> gets backported to v6.1 at least. Otherwise, EFI compliant systems
> that implement get/set_time but not get/set_wakeup_time have no RTC at
> all on any LTS kernel until a year from now, and this was never the
> intent when we introduced the EFI_RT_PROPERTIES_TABLE.

Thanks for considering the fix for stable releases, I'll post v3 patch
with tag 'CC: <stable@...r.kernel.org> # v6.0+'