[Freedreno] [PATCH 07/12] drm/msm/adreno: Move speedbin mapping to device table

[Rob Clark]

On Thu, Jul 6, 2023 at 7:54 PM Dmitry Baryshkov
<dmitry.baryshkov at linaro.org> wrote:
>
> On 07/07/2023 00:10, Rob Clark wrote:
> > From: Rob Clark <robdclark at chromium.org>
> >
> > This simplifies the code.
> >
> > Signed-off-by: Rob Clark <robdclark at chromium.org>
> > ---
> >   drivers/gpu/drm/msm/adreno/a6xx_gpu.c      | 171 ++-------------------
> >   drivers/gpu/drm/msm/adreno/adreno_device.c |  51 ++++++
> >   drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  25 +++
> >   3 files changed, 92 insertions(+), 155 deletions(-)
>
>
> Interesting hack, I'd say.
>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
>
> Minor nit below.
>
> >
>
> > diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> > index d5335b99c64c..994ac26ce731 100644
> > --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> > +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
> > @@ -72,8 +72,33 @@ struct adreno_info {
> >       u32 inactive_period;
> >       const struct adreno_reglist *hwcg;
> >       u64 address_space_size;
> > +     /**
> > +      * @speedbins: Optional table of fuse to speedbin mappings
> > +      *
> > +      * Consists of pairs of fuse, index mappings, terminated with
> > +      * UINT_MAX sentinal.
> > +      */
> > +     uint32_t *speedbins;
>
> Would it be better to explicitly list this as pairs of uint32_t? And
> then use braces in ADRENO_SPEEDBIN initialisation.

It would mean the sentinel would take 8 bytes instead of 4.. maybe
that is over-thinking it, but it was the reason I just stuck with a
flat table

BR,
-R

> >   };
> >
> > +/*
> > + * Helper to build a speedbin table, ie. the table:
> > + *      fuse | speedbin
> > + *      -----+---------
> > + *        0  |   0
> > + *       169 |   1
> > + *       174 |   2
> > + *
> > + * would be declared as:
> > + *
> > + *     .speedbins = ADRENO_SPEEDBINS(
> > + *                      0,   0,
> > + *                      169, 1,
> > + *                      174, 2
> > + *                  ),
> > + */
> > +#define ADRENO_SPEEDBINS(tbl...) (uint32_t[]) { tbl, UINT_MAX }
> > +
> >   const struct adreno_info *adreno_info(struct adreno_rev rev);
> >
> >   struct adreno_gpu {
>
> --
> With best wishes
> Dmitry
>