[Intel-gfx] [PATCH v3] drm/i915: Restrict qgv points which don't have enough bandwidth.

[Ville Syrjälä]

On Mon, Oct 14, 2019 at 02:13:31PM +0300, Lisovskiy, Stanislav wrote:
> On Fri, 2019-10-11 at 16:49 -0700, James Ausmus wrote:
> > > +				new_qgv_points_mask |= new_mask_bit;
> > > +	}
> > > +
> > > +	ret = icl_pcode_restrict_qgv_points(dev_priv,
> > > new_qgv_points_mask);
> > > +	if (ret < 0)
> > > +		DRM_DEBUG_KMS("Could not restrict required gqv
> > > points(%d)\n", ret);
> > 
> > s/gqv/qgv/
> > 
> > 
> > Also, if we fail masking off the qgv points that can't support our BW
> > req, shouldn't we handle that failure somehow - maybe just disable
> > SAGV
> > entirely?  Better we lose power than have flickering screens...

Sounds like dead code to me. My approach is: don't deal with hw/firmware
failures until they are proven to exist.

The debug msg should be an error so that we get a bug report if this
ever happens.

-- 
Ville Syrjälä
Intel
---------------------------------------------------------------------
Intel Finland Oy
Registered Address: PL 281, 00181 Helsinki 
Business Identity Code: 0357606 - 4 
Domiciled in Helsinki 

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.