[Intel-gfx] [PATCH v2 11/11] drm/i915: Allow static DRRS on LVDS

[Ville Syrjälä]

On Thu, Mar 31, 2022 at 04:59:11PM +0300, Jani Nikula wrote:
> On Thu, 31 Mar 2022, Ville Syrjala <ville.syrjala at linux.intel.com> wrote:
> > From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> >
> > Nothing special about static DRRS on LVDS, it's just your
> > bog standard modeset. Let's allow it.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_lvds.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_lvds.c b/drivers/gpu/drm/i915/display/intel_lvds.c
> > index 73129d21f5e5..e8478161f8b9 100644
> > --- a/drivers/gpu/drm/i915/display/intel_lvds.c
> > +++ b/drivers/gpu/drm/i915/display/intel_lvds.c
> > @@ -968,7 +968,8 @@ void intel_lvds_init(struct drm_i915_private *dev_priv)
> >  	intel_connector->edid = edid;
> >  
> >  	/* Try EDID first */
> > -	intel_panel_add_edid_fixed_modes(intel_connector, false);
> > +	intel_panel_add_edid_fixed_modes(intel_connector,
> > +					 dev_priv->vbt.drrs_type != DRRS_TYPE_NONE);
> 
> I guess the final question on this, and the previous patch for that
> matter, is why would the VBT block your regular modeset between two
> different refresh rates?
> 
> It does sound like the VBT setting is more about OEM decided policy than
> anything else.

Or just lack of validation.

> 
> Anyway,
> 
> Reviewed-by: Jani Nikula <jani.nikula at intel.com>
> 
> >  
> >  	/* Failed to get EDID, what about VBT? */
> >  	if (!intel_panel_preferred_fixed_mode(intel_connector))
> 
> -- 
> Jani Nikula, Intel Open Source Graphics Center

-- 
Ville Syrjälä
Intel