[Intel-gfx] [PATCH] drm/i915: Use the first mode if there is no preferred mode in the EDID

[Jesse Barnes]

On Tue, 13 May 2014 16:50:12 +0100
Chris Wilson <chris at chris-wilson.co.uk> wrote:

> On Tue, May 13, 2014 at 04:07:37PM +0100, Chris Wilson wrote:
> > This matches the algorithm used by earlier kernels when selecting the
> > mode for the fbcon. And only if there is no modes at all, do we fall
> > back to using the BIOS configuration. Seamless transition is still
> > preserved (from the BIOS configuration to ours) so long as the BIOS has
> > also chosen what we hope is the native configuration.
> > 
> > Reported-by: Knut Petersen <Knut_Petersen at t-online.de>
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78655
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: stable at vger.kernel.org
> > ---
> >  drivers/gpu/drm/i915/intel_fbdev.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c
> > index 1d3f0a9cce31..05beec4badd5 100644
> > --- a/drivers/gpu/drm/i915/intel_fbdev.c
> > +++ b/drivers/gpu/drm/i915/intel_fbdev.c
> > @@ -397,6 +397,14 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper,
> >  							  height);
> >  		}
> >  
> > +		/* No preferred mode marked by the EDID? Are there any modes? */
> > +		if (!modes[i] && !list_empty(&connector->modes)) {
> > +			DRM_DEBUG_KMS("using first mode listed on connector %s\n",
> > +				      drm_get_connector_name(connector));
> > +			modes[i] = list_first_entry(struct drm_display_mode,
> > +						    &connector->modes, head);
> 
> Please imagine that I wrote this correctly.

Imagining you wrote it correctly:
Reviewed-by: Jesse Barnes <jbarnes at virtuousgeek.org>


-- 
Jesse Barnes, Intel Open Source Technology Center