[Intel-gfx] [PATCH] drm/i915/ehl: Update voltage level checks

[Souza, Jose]

On Mon, 2019-11-18 at 08:50 -0800, Matt Roper wrote:
> On Mon, Nov 18, 2019 at 08:44:12AM -0800, Matt Roper wrote:
> > The bspec was recently updated with new cdclk -> voltage level
> > tables to
> > accomodate the new 324/326.4 cdclk values.
> > 
> > Bspec: 21809
> > Cc: José Roberto de Souza <jose.souza at intel.com>
> > Cc: Vivek Kasireddy <vivek.kasireddy at intel.com>
> > Cc: Bob Paauwe <bob.j.paauwe at intel.com>
> > Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
> 
> And
> 
> Fixes: 63c9dae71dc5 ("drm/i915/ehl: Add voltage level requirement
> table")
> 
> since using the old table could result in us requesting too low a
> voltage level for the highest cdclk values.


Reviewed-by: José Roberto de Souza <jose.souza at intel.com>


> 
> 
> Matt
> 
> > ---
> > There are some platform tagging issues on this bspec page and
> > multiple
> > tables are actually tagged with the EHL label, but the bspec
> > changelog
> > makes it pretty clear which table we're supposed to be using (plus
> > the
> > other tables don't match the set of cdclks supported by the
> > platform).
> > 
> >  drivers/gpu/drm/i915/display/intel_cdclk.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
> > b/drivers/gpu/drm/i915/display/intel_cdclk.c
> > index 8b702317557e..7d1ab1e5b7c3 100644
> > --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> > +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> > @@ -1273,7 +1273,9 @@ static u8 icl_calc_voltage_level(int cdclk)
> >  
> >  static u8 ehl_calc_voltage_level(int cdclk)
> >  {
> > -	if (cdclk > 312000)
> > +	if (cdclk > 326400)
> > +		return 3;
> > +	else if (cdclk > 312000)
> >  		return 2;
> >  	else if (cdclk > 180000)
> >  		return 1;
> > -- 
> > 2.21.0
> >