[PATCH v2] drm/i915/vrr: Stop writing VRR_CTL_IGN_MAX_SHIFT for MTL onwards

[Hogander, Jouni]

On Wed, 2025-04-09 at 13:30 +0530, Nautiyal, Ankit K wrote:
> 
> On 4/9/2025 11:19 AM, Jouni Högander wrote:
> > According to Bspec VRR_CTL_IGN_MAX_SHIFT doesn't exist for MTL and
> > onwards. On LunarLake and onwards Bit 30 is "Mask Block PkgC"
> > instead. Stop
> > writing the bit for MeteorLake and onwards
> > 
> > v2: "Ignore Max Shift" bit doesn't exist on MeteorLake either
> > 
> > Bspec: 68925
> 
> Perhaps you can add 50508 or 71956 for MTL.
> 
> Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>

This is now pushed to drm-intel-next. Thank you for checking my patch.

BR,

Jouni Högander

> 
> 
> > Signed-off-by: Jouni Högander <jouni.hogander at intel.com>
> > ---
> >   drivers/gpu/drm/i915/display/intel_vrr.c | 5 ++++-
> >   1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_vrr.c
> > b/drivers/gpu/drm/i915/display/intel_vrr.c
> > index 633a66f6b73b..c6565baf815a 100644
> > --- a/drivers/gpu/drm/i915/display/intel_vrr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_vrr.c
> > @@ -444,7 +444,10 @@ static u32 trans_vrr_ctl(const struct
> > intel_crtc_state *crtc_state)
> >   {
> >   	struct intel_display *display =
> > to_intel_display(crtc_state);
> >   
> > -	if (DISPLAY_VER(display) >= 13)
> > +	if (DISPLAY_VER(display) >= 14)
> > +		return VRR_CTL_FLIP_LINE_EN |
> > +			XELPD_VRR_CTL_VRR_GUARDBAND(crtc_state-
> > >vrr.guardband);
> > +	else if (DISPLAY_VER(display) >= 13)
> >   		return VRR_CTL_IGN_MAX_SHIFT |
> > VRR_CTL_FLIP_LINE_EN |
> >   			XELPD_VRR_CTL_VRR_GUARDBAND(crtc_state-
> > >vrr.guardband);
> >   	else