[Intel-gfx] [PATCH] drm/i915/mtl: do not enable render power-gating on MTL

[Vivi, Rodrigo]

On Wed, 2023-05-17 at 17:12 +0200, Das, Nirmoy wrote:
> 
> On 5/17/2023 3:59 PM, Andrzej Hajda wrote:
> > Multiple CI tests fails with forcewake ack timeouts
> > if render power gating is enabled.
> > BSpec 52698 clearly states it should be 0 for MTL.
> > 
> > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4983
> > Signed-off-by: Andrzej Hajda <andrzej.hajda at intel.com>
> > ---
> >   drivers/gpu/drm/i915/gt/intel_rc6.c | 5 +++--
> >   1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/gt/intel_rc6.c
> > b/drivers/gpu/drm/i915/gt/intel_rc6.c
> > index 908a3d0f2343f4..ebb2373dd73640 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_rc6.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_rc6.c
> > @@ -117,8 +117,9 @@ static void gen11_rc6_enable(struct intel_rc6
> > *rc6)
> >                         GEN6_RC_CTL_RC6_ENABLE |
> >                         GEN6_RC_CTL_EI_MODE(1);
> >   
> > -       /* Wa_16011777198 - Render powergating must remain disabled
> > */
> > -       if (IS_DG2_GRAPHICS_STEP(gt->i915, G10, STEP_A0, STEP_C0)
> > ||
> > +       /* Wa_16011777198 and BSpec 52698 - Render powergating must
> > be off */
> 
> Nice catch!

Indeed! What a mess in the workaround database.
It is telling us that no_impact on MTL SKUs while we clearly needs
that. I tried to reopen that and get that fixed in the hsds.


>  instead of bspec you could add Wa_14012655556.

not actually.
16011777198 is the right lineage number for 14012655556.
Besides, 14012655556 is for DG2 anyway.

Let's keep the way Adrzej put with the BSPec reference besides the
lineage.

> 
> 
> > +       if (IS_METEORLAKE(gt->i915) ||
> > +           IS_DG2_GRAPHICS_STEP(gt->i915, G10, STEP_A0, STEP_C0)
> > ||
> >             IS_DG2_GRAPHICS_STEP(gt->i915, G11, STEP_A0, STEP_B0))
> >                 pg_enable =
> >                         GEN9_MEDIA_PG_ENABLE |
> > 
> > ---
> > base-commit: 01d3dd92d1b71421f6ee85e1bea829e0a917d979
> > change-id: 20230517-mtl_disable_render_pg-b9f9f1567f9e
> 
> ^ unwanted artifacts ?   Otherwise this looks good to me.
> 
> Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>

with the artifacts removed:
Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>


> 
> > 
> > Best regards,