linux-kernel - Re: [PATCH v2 4/5] firmware: add SmPL report for custom fallback mechanism

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Date:   Wed, 11 Jan 2017 11:25:15 -0600
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Ming Lei <ming.lei@...onical.com>,
        Daniel Wagner <daniel.wagner@...-carit.de>,
        Tom Gundersen <teg@...m.no>,
        Mauro Carvalho Chehab <mchehab@....samsung.com>,
        Rafał Miłecki <zajec5@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Vikram Mulukutla <markivx@...eaurora.org>,
        Stephen Boyd <stephen.boyd@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Takashi Iwai <tiwai@...e.de>,
        Johannes Berg <johannes@...solutions.net>,
        Christian Lamparter <chunkeey@...glemail.com>,
        Hauke Mehrtens <hauke@...ke-m.de>,
        Josh Boyer <jwboyer@...oraproject.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Jiri Slaby <jslaby@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <j.anaszewski@...sung.com>,
        Abhay Salunke <Abhay_Salunke@...l.com>,
        Julia Lawall <Julia.Lawall@...6.fr>,
        Gilles Muller <Gilles.Muller@...6.fr>,
        Nicolas Palix <nicolas.palix@...g.fr>,
        David Howells <dhowells@...hat.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arend Van Spriel <arend.vanspriel@...adcom.com>,
        Kalle Valo <kvalo@...eaurora.org>, linux-leds@...r.kernel.org
Subject: Re: [PATCH v2 4/5] firmware: add SmPL report for custom fallback mechanism

On Wed, Jan 11, 2017 at 9:49 AM, Greg KH <gregkh@...uxfoundation.org> wrote:
> On Wed, Jan 11, 2017 at 03:02:22PM +0100, Luis R. Rodriguez wrote:
>> On Wed, Jan 11, 2017 at 09:32:26AM +0100, Greg KH wrote:
>> > On Fri, Dec 16, 2016 at 03:10:37AM -0800, Luis R. Rodriguez wrote:
>> > > Even though most distributions today disable the fallback mechanism
>> > > by default we've determined that we cannot remove them from the kernel.
>> > > This is not well understood so document the reason and logic behind that.
>> >
>> > Well, the biggest reason is that some distros still rely on this.  I've
>> > seen new products being made that rely on it,
>>
>> Let's be a bit more precise: upstream there are only two driver relying on this
>> and I've learned about the non-upstream uses which folks have been calling for
>> ensuring this functionality is kept for: a) non-upstream mobile 802.11 drivers or
>> upstream 802.11 drivers with slight out-of-tree customizations with a requirements to
>> get calibration data using custom mechanisms b) remote-proc users with huge firmware
>> requirements for which initramfs is not well suited for.
>
> That b) is a lot of devices, I know of a few million phones in the wild
> right now that rely on it.  And millions is a pretty big number :)
>
> Anyway, thanks for addressing my concerns, I'm guessing you will respin
> these remaining patches and resend them as I think there were still some
> comments on them?  I took the first 3 here.

Yeah sure, I will address these comments.

> Is the "drvdata" code ready in your opinion to be merged / reviewed yet?

drvdata stuff is ready as can be but after the sysdata/drvdata rename
change I failed to change one of the p54 files, I also forgot to Cc
Boris on the microcode conversion so I can just respin the drvdata
series again as a separate series right after I address the concerns
for this series.

 Luis