linux-kernel - Re: [PATCH v2 2/2] Doc/ABI: sysfs-drm initial document; "polled" entry

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Date:	Wed, 22 Sep 2010 12:36:06 -0400
From:	Andy Walls <awalls@...metrocast.net>
To:	Greg KH <greg@...ah.com>
Cc:	linux-kernel@...r.kernel.org,
	Rafał Miłecki <zajec5@...il.com>,
	Dave Airlie <airlied@...hat.com>,
	dri-devel@...ts.freedesktop.org, Jon Smirl <jonsmirl@...il.com>
Subject: Re: [PATCH v2 2/2] Doc/ABI: sysfs-drm initial document; "polled"
 entry

On Wed, 2010-09-22 at 08:06 -0700, Greg KH wrote:
> On Tue, Sep 21, 2010 at 11:20:22PM -0400, Andy Walls wrote:
> > +Where:		/sys/devices/<...>/drm/cardN/cardN-C-M/polled
> > +		For N a decimal system graphics adapter number: 0, 1, 2, ...
> > +		For C a connector type name (including spaces) from the set:
> 
> Spaces?  Really?  Yeah, I know it will work just fine, but why go out of
> your way to make it hard for people?

Not my fault.
It was like that when I got here.


$ ls -d /sys/devices/pci0000\:00/0000\:00\:01.0/0000\:01\:05.0/drm//card0/card0*
/sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/drm//card0/card0-DVI-D-1
/sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/drm//card0/card0-HDMI Type A-1
/sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/drm//card0/card0-VGA-1

I only added one entry, "polled", in those existing directories.

BTW, Jon Smirl, IBM Corp, and you have Copyright credit in the
drm_sysfs.c file that creates those directories with spaces.  ;)


I'll also gripe that PCI's colons are pretty annoying on the command
line too, since they have to be escaped as well.


> > +			HDMI Type A
> > +			HDMI Type B
> > +			TV
> > +			Embedded DisplayPort
> 
> You could always just use a '_' instead of a space for those that need
> it.

A trivial patch here would do that:

http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=blob;f=drivers/gpu/drm/drm_crtc.c;h=37e0b4fa482a810afc9eded6fda136a90bcc5cc0;hb=refs/heads/drm-fixes#l146

but I have no idea what that might break.

Regards,
Andy


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