linux-kernel - Re: [PATCH] drm/sti: Remove select of CONFIG_FW_LOADER_USER_HELPER

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Date:	Thu, 29 Oct 2015 15:53:29 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Emil Velikov <emil.l.velikov@...il.com>
Cc:	Vincent ABRIOU <vincent.abriou@...com>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/sti: Remove select of CONFIG_FW_LOADER_USER_HELPER_FALLBACK

On Thu, 29 Oct 2015 15:37:51 +0100,
Emil Velikov wrote:
> 
> On 29 October 2015 at 14:21, Vincent ABRIOU <vincent.abriou@...com> wrote:
> > Hi Takashi,
> >
> > Removing FW_LOADER_USER_HELPER_FALLBACK leads to a failure in our HQVDP
> > firmware execution.
> > Indeed, our firmware is not built-in. It is a proprietary firmware
> > uploaded into the file system that's why we need the
> > USER_HELPER_FALLBACK to be able to load it once file system is available.
> >
> Hmm most other DRM drivers also require firmware. Whist some allow the
> firmware to be picked in initrd it's not a strict requirement.
> So I'm wondering how come there hasn't been (m)any reports,
> considering that neither one sets USER_HELPER_FALLBACK.
> 
> Perhaps they also need it, or something in the sti module is done
> differently ? Just some food for thought.

It's the option each user decides to set or not, depending on the
deployed system.  Most of PCs don't need them, and actually enabling
this option causes troubles for them.  On other embedded systems, this
might be still needed.  So, it's the system setup issue, and not the
thing a driver needs to care.

Imagine that your driver has "select EXT3_FS" because your system
requires it; without that option, it won't boot, OMG!
Is it the right thing?  Obviously no.  The same logic is applied to
this case, too.


Takashi
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