[Intel-gfx] [PATCH 01/10] drm/i915: Don't register the CRT connector when it's fused off

[Ville Syrjälä]

On Tue, Dec 01, 2015 at 05:05:42PM -0200, Paulo Zanoni wrote:
> 2015-12-01 11:08 GMT-02:00  <ville.syrjala at linux.intel.com>:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > LPT-H has a strap bit for fused off CRT block. Check it to see if
> > we should register the CRT connector or not. Supposedly this also
> > forces the ADAP enable bit to 0, so the detection we added in
> > commit 6c03a6bd0dd8 ("drm/i915: Don't register CRT connector when it's fused off")
> 
> The interesting thing is that the commit title of 6c03a6 is almost the
> same as this one, the only difference being the word "the" :).

Demonstrates a lack of imagination on the author's part?

> 
> > should already catch it, but checking the fuse bit should at least
> > do no harm.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_reg.h      | 1 +
> >  drivers/gpu/drm/i915/intel_display.c | 3 +++
> >  2 files changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> > index 487224572022..6d7ac192982d 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -7549,6 +7549,7 @@ enum skl_disp_power_wells {
> >  #define SFUSE_STRAP                    _MMIO(0xc2014)
> >  #define  SFUSE_STRAP_FUSE_LOCK         (1<<13)
> >  #define  SFUSE_STRAP_DISPLAY_DISABLED  (1<<7)
> > +#define  SFUSE_STRAP_CRT_DISABLED      (1<<6)
> >  #define  SFUSE_STRAP_DDIB_DETECTED     (1<<2)
> >  #define  SFUSE_STRAP_DDIC_DETECTED     (1<<1)
> >  #define  SFUSE_STRAP_DDID_DETECTED     (1<<0)
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index 4ae490dfe2c4..c3d5a7319ef4 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -14256,6 +14256,9 @@ static bool intel_crt_present(struct drm_device *dev)
> >         if (IS_CHERRYVIEW(dev))
> >                 return false;
> >
> > +       if (HAS_PCH_LPT(dev) && I915_READ(SFUSE_STRAP) & SFUSE_STRAP_CRT_DISABLED)
> 
> Bonus points if you use your new HAS_PCH_LPT_H() here.

I can. Though we already reject ULT/ULX machines earlier, so anything
that reaches this will be -H anyway.

> 
> With or without that:
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
> 
> > +               return false;
> > +
> >         if (IS_VALLEYVIEW(dev) && !dev_priv->vbt.int_crt_support)
> >                 return false;
> >
> > --
> > 2.4.10
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> 
> 
> -- 
> Paulo Zanoni

-- 
Ville Syrjälä
Intel OTC