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

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Date:   Fri, 16 Dec 2016 10:29:52 +0100
From:   "Luis R. Rodriguez" <mcgrof@...nel.org>
To:     Milo Kim <woogyom.kim@...il.com>
Cc:     Jacek Anaszewski <j.anaszewski@...sung.com>,
        "Luis R. Rodriguez" <mcgrof@...nel.org>,
        gregkh@...uxfoundation.org, ming.lei@...onical.com,
        daniel.wagner@...-carit.de, teg@...m.no, mchehab@....samsung.com,
        zajec5@...il.com, linux-kernel@...r.kernel.org,
        markivx@...eaurora.org, stephen.boyd@...aro.org,
        broonie@...nel.org, zohar@...ux.vnet.ibm.com, tiwai@...e.de,
        johannes@...solutions.net, chunkeey@...glemail.com,
        hauke@...ke-m.de, jwboyer@...oraproject.org,
        dmitry.torokhov@...il.com, dwmw2@...radead.org, jslaby@...e.com,
        torvalds@...ux-foundation.org, luto@...capital.net,
        fengguang.wu@...el.com, rpurdie@...ys.net, Abhay_Salunke@...l.com,
        Julia.Lawall@...6.fr, Gilles.Muller@...6.fr, nicolas.palix@...g.fr,
        dhowells@...hat.com, bjorn.andersson@...aro.org,
        arend.vanspriel@...adcom.com, kvalo@...eaurora.org,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH 4/5] firmware: add SmPL report for custom fallback
 mechanism

On Wed, Dec 14, 2016 at 10:48:37AM +0900, Milo Kim wrote:
> Hi Jacek,
> 
> On 12/13/2016 06:44 PM, Jacek Anaszewski wrote:
> > 
> > Could you please verify if leds-lp55xx-common.c driver
> > really needs a custom firmware loading fallback mechanism?
> 
> Thanks for sharing this. The lp55xx-common uses this mechanism to load and
> run LED effect manually, so this could be a misuse case.
> I think the right solution is providing device attributes.

Run LED manually using request_firmware()? What the.. yes this sounds odd.

> At this moment, four drivers use lp55xx-common code.
> 
> - lp5521, lp5523: OK if we do not support FW loading fallback mechanism
> - lp5562, lp8501: need to create additional sysfs alternatively.

Phew!

> However, we should be careful because I'm not sure this modification will
> generate the regression (breaking the user-space) or not.

Right so not breaking old userspace is critical.

  Luis