linux-kernel - Re: [RFC PATCH v2 1/4] drm: Introduce generic probe function for component based masters.

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Message-ID: <20151019145027.GF32532@n2100.arm.linux.org.uk>
Date:	Mon, 19 Oct 2015 15:50:27 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Daniel Vetter <daniel@...ll.ch>
Cc:	Liviu Dudau <Liviu.Dudau@....com>, David Airlie <airlied@...ux.ie>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Mark Yao <mark.yao@...k-chips.com>,
	Heiko Stuebner <heiko@...ech.de>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-rockchip <linux-rockchip@...ts.infradead.org>,
	LAKML <linux-arm-kernel@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v2 1/4] drm: Introduce generic probe function for
 component based masters.

On Mon, Oct 19, 2015 at 04:42:25PM +0200, Daniel Vetter wrote:
> On Mon, Oct 19, 2015 at 02:26:38PM +0100, Russell King - ARM Linux wrote:
> > On Mon, Oct 19, 2015 at 02:02:58PM +0100, Liviu Dudau wrote:
> > > On Mon, Oct 19, 2015 at 01:25:37PM +0100, Russell King - ARM Linux wrote:
> > > > Please don't move this into here, it's completely inappropriate.  Just
> > > > because something makes use of this does not mean they only support
> > > > 32-bit DMA.  Besides, this has nothing to do with whether or not it's
> > > > OF-based or not.
> > > 
> > > Understood. My thinking process was that component-based drivers are all
> > > OF-enabled (how else do you make use of the framework?) and 32-bit DMA is
> > > present in 2 out of 3 drivers that are converted, so it looks to be common
> > > enough that adding it to armada would not hurt. It was all done in the name of
> > > collecting common code in a single function.
> > 
> > Which is an utterly crap reason.
> > 
> > It's also not appropriate.  I'm really not sure why you think that moving
> > this here would in any way be appropriate - from my point of view, the
> > mere proposal is utterly insane.
> > 
> > The "container" device does not do any DMA, so it's inappropriate for
> > it to have DMA masks set or negotiated on it.  So, actually, no one
> > should be setting the DMA mask for their container device.  It's wrong.
> 
> I think (and my opinion doesn't carry as much wheight here on dri-devel
> than intel-gfx) the above is over the top bashing of a new contributor to
> drm who really seems trying to do right. I think that's unecessary,
> especially since you follow up with the reasonable reply below.

It's justified because it took _two_ messages to get the point across.
The first one asking nicely didn't make the necessary impact.

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