linux-kernel - Re: [Stable-review] [06/49] drm/kms: remove spaces from connector names (v2)

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Date:	Wed, 5 Jan 2011 19:32:29 -0500
From:	Alex Deucher <alexdeucher@...il.com>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, Sergej Pupykin <ml@...gej.pp.ru>,
	Dave Airlie <airlied@...hat.com>, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, stable-review@...nel.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [Stable-review] [06/49] drm/kms: remove spaces from connector
 names (v2)

On Wed, Jan 5, 2011 at 7:04 PM, Ben Hutchings <ben@...adent.org.uk> wrote:
> On Wed, 2011-01-05 at 15:56 -0800, Greg KH wrote:
>> On Wed, Jan 05, 2011 at 11:49:05PM +0000, Ben Hutchings wrote:
>> > On Wed, 2011-01-05 at 15:00 -0800, Greg KH wrote:
>> > > 2.6.32-longterm review patch.  If anyone has any objections, please let us know.
>> > >
>> > > ------------------
>> > >
>> > > From: Alex Deucher <alexdeucher@...il.com>
>> > >
>> > > commit e76116ca9671e2e5239054a40303b94feab585ad upstream.
>> > >
>> > > Grub doesn't parse spaces in parameters correctly, so
>> > > this makes it impossible to force video= parameters
>> > > for kms on the grub kernel command line.
>> > >
>> > > v2: shorten the names to make them easier to type.
>> > [...]
>> > > --- a/drivers/gpu/drm/drm_crtc.c
>> > > +++ b/drivers/gpu/drm/drm_crtc.c
>> > > @@ -144,10 +144,10 @@ static struct drm_conn_prop_enum_list dr
>> > >   { DRM_MODE_CONNECTOR_SVIDEO, "SVIDEO", 0 },
>> > >   { DRM_MODE_CONNECTOR_LVDS, "LVDS", 0 },
>> > >   { DRM_MODE_CONNECTOR_Component, "Component", 0 },
>> > > - { DRM_MODE_CONNECTOR_9PinDIN, "9-pin DIN", 0 },
>> > > - { DRM_MODE_CONNECTOR_DisplayPort, "DisplayPort", 0 },
>> > > - { DRM_MODE_CONNECTOR_HDMIA, "HDMI Type A", 0 },
>> > > - { DRM_MODE_CONNECTOR_HDMIB, "HDMI Type B", 0 },
>> > > + { DRM_MODE_CONNECTOR_9PinDIN, "DIN", 0 },
>> > > + { DRM_MODE_CONNECTOR_DisplayPort, "DP", 0 },
>> > [...]
>> >
>> > Why change 'DisplayPort', which doesn't have a space in it?  This might
>> > break a previously working kernel command line.
>>
>> That's what happened in Linus's tree, I just mirror it :)
>
> Yeah, sorry, that was really directed at Alex.

We wanted to make them shorter so as to be easier to type on the
command line.  I don't think anyone uses these much at the moment.
Also, you can't force displayport on like other encoders, so if it's
not detected, you are out of luck.

Alex

>
> Ben.
>
> --
> Ben Hutchings
> Once a job is fouled up, anything done to improve it makes it worse.
>
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