linux-kernel - Re: [Intel-gfx] [PATCH 5/5] drm/i915: Kick out vga console

Open Source and information security mailing list archives

Message-ID: <20140708081012.GN17271@phenom.ffwll.local>
Date:	Tue, 8 Jul 2014 10:10:12 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Ed Tomlinson <edt@....ca>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Herrmann <dh.herrmann@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	linux-fbdev@...r.kernel.org,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	Dave Airlie <airlied@...ux.ie>
Subject: Re: [Intel-gfx] [PATCH 5/5] drm/i915: Kick out vga console

On Mon, Jul 07, 2014 at 10:53:16PM -0400, Ed Tomlinson wrote:
> Hi Daniel,
> 
> The patch below also works.  You can use my Tested By for it.

Thanks a lot for testing, patch submitted and should get forwarded asap.
> 
> Thanks
> Ed Tomlinson <edtoml@...il.com>
> 
> PS. I _really_ need to get a serial console working on my i7 box.

Usually this doesn't help a lot with gfx initialization issues since we do
an awful lot of setup while holding the console_lock. Which prevents any
dmesg output on any console :(

Cheers, Daniel

> 
> On Monday 07 July 2014 14:26:54 Daniel Vetter wrote:
> > On Mon, Jul 07, 2014 at 06:45:49AM -0400, Ed Tomlinson wrote:
> > > Daniel,
> > > 
> > > I am not quite sure I understand what you want me to test?
> > > Do you want me to try it without:
> > > 
> > > > > +               if (ret == 0) {
> > > > > +                       ret = do_unregister_con_driver(&vga_con);
> > 
> > Below the diff of what I mean.
> > -Daniel
> > 
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> > index 5e583a1838f8..bd8517151479 100644
> > --- a/drivers/gpu/drm/i915/i915_dma.c
> > +++ b/drivers/gpu/drm/i915/i915_dma.c
> > @@ -1466,12 +1466,13 @@ static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
> >  #else
> >  static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv)
> >  {
> > -	int ret;
> > +	int ret = 0;
> >  
> >  	DRM_INFO("Replacing VGA console driver\n");
> >  
> >  	console_lock();
> > -	ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
> > +	if (con_is_bound(&vga_con))
> > +		ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1);
> >  	if (ret == 0) {
> >  		ret = do_unregister_con_driver(&vga_con);
> >  
> > 
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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