[Intel-xe] [PATCH v2 rebased 3/6] drm/i915: Only initialize dlk phy lock in display 12 and newer

[Souza, Jose]

On Mon, 2023-04-10 at 11:37 -0400, Rodrigo Vivi wrote:
> On Thu, Apr 06, 2023 at 07:31:30AM -0700, José Roberto de Souza wrote:
> > This spin lock will not be used in older display versions, so no need
> > to initialize it.
> 
> Should we add some warn_on(disp_ver < 12) on the dkl phy functions?

If called in platforms with display version older than 12 we will get warnings about spink lock functions being called in a non initialized spinlock_t
anyways.

> 
> Anyway:
> 
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
> 
> 
> > 
> > Cc: intel-gfx at lists.freedesktop.org
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_dkl_phy.c | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_dkl_phy.c b/drivers/gpu/drm/i915/display/intel_dkl_phy.c
> > index 5bce7b5b27bc7..1c5d410b74e5d 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dkl_phy.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dkl_phy.c
> > @@ -108,5 +108,6 @@ intel_dkl_phy_posting_read(struct drm_i915_private *i915, struct intel_dkl_phy_r
> >  void
> >  intel_dkl_phy_init(struct drm_i915_private *i915)
> >  {
> > -	spin_lock_init(&i915->display.dkl.phy_lock);
> > +	if (DISPLAY_VER(i915) >= 12)
> > +		spin_lock_init(&i915->display.dkl.phy_lock);
> >  }
> > -- 
> > 2.40.0
> >