Re: [Intel-gfx] [PATCH 2/4] drm/i915/mtl: Modify CAGF functions for MTL

["Dixit, Ashutosh" <ashutosh.dixit@intel.com>]

On Wed, 19 Oct 2022 07:58:13 -0700, Rodrigo Vivi wrote:
>
> On Tue, Oct 18, 2022 at 10:20:41PM -0700, Ashutosh Dixit wrote:
> > diff --git a/drivers/gpu/drm/i915/gt/intel_rps.c b/drivers/gpu/drm/i915/gt/intel_rps.c
> > index df21258976d86..5a743ae4dd11e 100644
> > --- a/drivers/gpu/drm/i915/gt/intel_rps.c
> > +++ b/drivers/gpu/drm/i915/gt/intel_rps.c
> > @@ -2093,7 +2093,9 @@ u32 intel_rps_get_cagf(struct intel_rps *rps, u32 rpstat)
> >	struct drm_i915_private *i915 = rps_to_i915(rps);
> >	u32 cagf;
> >
> > -	if (GRAPHICS_VER(i915) >= 12)
> > +	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70))
> > +		cagf = rpstat & MTL_CAGF_MASK;
>
> I believe we should advocate more the use of the REG_FIELD_GET
>
>   cagf = REG_FIELD_GET(MTL_CAGF_MASK, rpstat);
>
> > +	else if (GRAPHICS_VER(i915) >= 12)
> >		cagf = (rpstat & GEN12_CAGF_MASK) >> GEN12_CAGF_SHIFT;
>
> cagf = REG_FIELD_GET(GEN12_CAGF_MASK, rpstat);
> // witht the proper REG_GENAMSK usage on the gen12_cagf_mask...
>
> >	else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915))
> >		cagf = (rpstat >> 8) & 0xff;
>
>  #define RPE_MASK REG_GENMASK(15, 8)
>          cagf = REG_FIELD_GET(RPE_MASK, rpstat)

All these are now converted to REG_FIELD_GET in series version v8.

> > @@ -2116,7 +2118,13 @@ static u32 read_cagf(struct intel_rps *rps)
> >	struct intel_uncore *uncore = rps_to_uncore(rps);
>                             ^
>
> >	u32 freq;
> >
> > -	if (GRAPHICS_VER(i915) >= 12) {
> > +	/*
> > +	 * For Gen12+ reading freq from HW does not need a forcewake and
> > +	 * registers will return 0 freq when GT is in RC6
> > +	 */
> > +	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 70)) {
> > +		freq = intel_uncore_read(rps_to_gt(rps)->uncore, MTL_MIRROR_TARGET_WP1);
>
> here we should use directly the local uncore already declared above with
> the same helper...  and consistent with the following elses...

Fixed.

>
> > +	} else if (GRAPHICS_VER(i915) >= 12) {
> >		freq = intel_uncore_read(uncore, GEN12_RPSTAT1);
> >	} else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
> >		vlv_punit_get(i915);
> > --
> > 2.38.0
> >

Thanks.
--
Ashutosh