+ Ashutosh(VBT team) + maulik
209 is confirmed version on kbl both by vbt team (Maulik) and google, so we had used it.
DK's suggestion is
if ((bdb->version >= 203 && IS_GEN9_BC(dev_priv)) ||
IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10) {
/* new mapping */
As per Ashutosh, 203 Is not the right version, 205 is fine , but user can still provide decimal value for SKL.
Jani/Rodrigo, should we use 205 for SKL or drop SKL from the new mapping?
-----Original Message-----
From: Pandiyan, Dhinakaran
Sent: Thursday, June 14, 2018 9:30 PM
To: Vivi, Rodrigo <rodrigo.vivi@xxxxxxxxx>; Nikula, Jani <jani.nikula@xxxxxxxxx>; Nagaraju, Vathsala <vathsala.nagaraju@xxxxxxxxx>
Cc: puthik@xxxxxxxxxxxx; intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [PATCH] drm/i915/psr: Adds psrwake options for all platforms
On Thu, 2018-06-14 at 11:59 +0530, Nagaraju, Vathsala wrote:
>
> On 6/13/2018 11:10 PM, Dhinakaran Pandiyan wrote:
> >
> > On Wed, 2018-06-13 at 10:32 -0700, Dhinakaran Pandiyan wrote:
> > >
> > > On Wed, 2018-06-13 at 09:41 +0300, Jani Nikula wrote:
> > > >
> > > > On Wed, 13 Jun 2018, "Nagaraju, Vathsala" <vathsala.nagaraju@in
> > > > tel.
> > > > co
> > > > m> wrote:
> > > > >
> > > > >
> > > > > On 6/12/2018 2:30 PM, Jani Nikula wrote:
> > > > > >
> > > > > >
> > > > > > On Tue, 12 Jun 2018, vathsala nagaraju <vathsala.nagaraju@i
> > > > > > ntel .c
> > > > > > om> wrote:
> > > > > > >
> > > > > > >
> > > > > > > From: Vathsala Nagaraju <vathsala.nagaraju@xxxxxxxxx>
> > > > > > >
> > > > > > > Adds new psrwake options defined in the below table.
> > > > > > > Platform PSR wake options vbt version
> > > > > > > KBL/CFL/WHL All
> > > > > > > SKL All PV releases (Check for 203+ might
> > > > > > > help
> > > > > > > but cannot be foolproof)
> > > > > > > BXT Uses old interpretation.
> > > > > > > CNL/ICL+ All
> > > > > > > GLK All
> > > > > > >
> > > > > > > For SKL, we will continue to use older interpretation for
> > > > > > > the above reason.
> > > > > > >
> > > > > > > Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> > > > > > > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> > > > > > > Cc: Puthikorn Voravootivat <puthik@xxxxxxxxxxxx>
> > > > > > > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> > > > > > >
> > > > > > > Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@intel
> > > > > > > .com
> > > > > > > ---
> > > > > > > drivers/gpu/drm/i915/intel_bios.c | 3 ++-
> > > > > > > 1 file changed, 2 insertions(+), 1 deletion(-)
> > > > > > >
> > > > > > > diff --git a/drivers/gpu/drm/i915/intel_bios.c
> > > > > > > b/drivers/gpu/drm/i915/intel_bios.c
> > > > > > > index 465dff4..010ff68 100644
> > > > > > > --- a/drivers/gpu/drm/i915/intel_bios.c
> > > > > > > +++ b/drivers/gpu/drm/i915/intel_bios.c
> > > > > > > @@ -710,7 +710,8 @@ static int
> > > > > > > intel_bios_ssc_frequency(struct drm_i915_private
> > > > > > > *dev_priv,
> > > > > > > * New psr options 0=500us, 1=100us, 2=2500us, 3=0us
> > > > > > > * Old decimal value is wake up time in multiples of
> > > > > > > 100 us.
> > > > > > > */
> > > > > > > - if (bdb->version >= 209 && IS_GEN9_BC(dev_priv))
> > > > > > > {
> > > > > > > + if ((INTEL_GEN(dev_priv) >= 10) ||
> > > > > > > + (IS_GEN9_BC(dev_priv) &&
> > > > > > > !IS_SKYLAKE(dev_priv)))
> > > > > > > {
> > > > > > Please keep the version check.
> > > > > Sure. For SKL , shall we use older interpretation for all bdb
> > > > > version as vbt team cannot confirm bdb version for SKL?
> > > > I guess.
> > > >
> > > Why not change the version check to >= 203, if that's what PV
> > > releases
> > > had as per your commit message? With the current code, Linux and
> > > Windows set 500 us and 2.5 ms respectively on my laptop.
> > Said laptop is a SKL with bdb version 205.
> + ashutosh(VBT team)
> Since VBT team cannot confirm version for SKL ,so skipped for
> skylake.
> I did a copy paste of the table provided by vbt team, will edit for
> skylake.
>
We are not going to get this right for all combinations, the best we
can do is make sure things work in most cases. I prefer to err on the
side of using the new mapping because when translated incorrectly, 3
out of 4 values lead to >= intended training time. Given the fact that
SKL PV releases also used the new mapping, I suggest you do this
if ((bdb->version >= 203 && IS_GEN9_BC(dev_priv)) ||
IS_GEMINILAKE(dev_priv) || INTEL_GEN(dev_priv) >= 10) {
/* new mapping */
}
I don't know what the basis for the current check for version 209 is,
other than it was the version on the KBL you tested.
-DK
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