linux-kernel - Re: [PATCH v1 0/2] video: fbdev: radeonfb: PCI PM framework upgrade and fix-ups.

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Date:   Mon, 7 Sep 2020 12:29:22 +0200
From:   Michel Dänzer <michel@...nzer.net>
To:     Vaibhav Gupta <vaibhavgupta40@...il.com>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <bjorn@...gaas.com>,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Thierry Reding <treding@...dia.com>,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH v1 0/2] video: fbdev: radeonfb: PCI PM framework upgrade
 and fix-ups.

On 2020-09-07 9:55 a.m., Daniel Vetter wrote:
> On Thu, Aug 06, 2020 at 12:52:54PM +0530, Vaibhav Gupta wrote:
>> Linux Kernel Mentee: Remove Legacy Power Management.
>>
>> The original goal of the patch series is to upgrade the power management
>> framework of radeonfb fbdev driver. This has been done by upgrading .suspend()
>> and .resume() callbacks.
>>
>> The upgrade makes sure that the involvement of PCI Core does not change the
>> order of operations executed in a driver. Thus, does not change its behavior.
>>
>> During this process, it was found that "#if defined(CONFIG_PM)" at line 1434 is
>> redundant. This was introduced in the commit
>> 42ddb453a0cd ("radeon: Conditionally compile PM code").
> 
> I do wonder whether it wouldn't be better to just outright delete these,
> we have the drm radeon driver for pretty much all the same hardware ...

In contrast to radeonfb, the radeon driver doesn't support 
suspend-to-RAM on Apple PowerPC notebooks.


-- 
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer