[Intel-gfx] [PATCH] drm/i915/cnl: Add information to missing case.

[Pandiyan, Dhinakaran]

On Fri, 2017-06-16 at 14:12 -0700, Manasi Navare wrote:
> On Fri, Jun 16, 2017 at 08:58:25PM +0000, Pandiyan, Dhinakaran wrote:
> > On Fri, 2017-06-16 at 13:20 -0700, Rodrigo Vivi wrote:
> > > This missing case could be reached out on missing
> > > type or missing voltage.
> > 
> > Should we even reach this far with a missing DDI type?
> > 
> > -DK
> >
> 
> Yes it is possible that we get into this situation if reading
> of the vccio voltage from PORT_COMP_DW3 returns a garbage value
> due to some corruption 

MISSING_CASE already logs that.

> or lets say the type is something that is not
> supported on this platform.
> 
But my question is, should we even be trying to program vswing without
knowing the ddi type or for an invalid type? 

> 
> > >  So let's add a debug
> > > message to make our lives easier whenever this
> > > might happen.
> > > 
> > > Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> > > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_ddi.c | 1 +
> > >  1 file changed, 1 insertion(+)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > > index e66947a..c96c8d0 100644
> > > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > > @@ -1802,6 +1802,7 @@ static void cnl_ddi_vswing_program(struct drm_i915_private *dev_priv,
> > >  	}
> > >  
> > >  	if (ddi_translations == NULL) {
> > > +		DRM_DEBUG_KMS("Missing DDI translation table for type %d with voltage %d\n", type, voltage);
> > >  		MISSING_CASE(voltage);
> > >  		return;
> > >  	}
> 
> Like Paulo suggested it would be better to use a switch statement for different vccio voltages
> and then have this in the default. What do you think?
> 
> Manasi
> 
> 
> > 
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