linux-kernel - Re: [PATCH 2/6] drm/etnaviv: determine product, customer and eco id

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Message-ID: <CAH9NwWddNNc+2rRsntm+_eYF0S9uwC0kTszpPysbzmkc4dNuNA@mail.gmail.com>
Date:   Mon, 6 Jan 2020 11:57:49 +0100
From:   Christian Gmeiner <christian.gmeiner@...il.com>
To:     Lucas Stach <l.stach@...gutronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        The etnaviv authors <etnaviv@...ts.freedesktop.org>,
        DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 2/6] drm/etnaviv: determine product, customer and eco id

Hi Lucas

Am Mo., 6. Jan. 2020 um 11:03 Uhr schrieb Lucas Stach <l.stach@...gutronix.de>:
>
> On Do, 2020-01-02 at 11:02 +0100, Christian Gmeiner wrote:
> > They will be used for extended HWDB support. The eco id logic was taken
> > from galcore kernel driver sources.
> >
> > Signed-off-by: Christian Gmeiner <christian.gmeiner@...il.com>
> > ---
> >  drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 17 +++++++++++++++++
> >  drivers/gpu/drm/etnaviv/etnaviv_gpu.h |  6 +++---
> >  2 files changed, 20 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> > index d47d1a8e0219..253301be9e95 100644
> > --- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> > +++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
> > @@ -321,6 +321,18 @@ static void etnaviv_hw_specs(struct etnaviv_gpu *gpu)
> >               gpu->identity.varyings_count -= 1;
> >  }
> >
> > +static void etnaviv_hw_eco_id(struct etnaviv_gpu *gpu)
> > +{
> > +     const u32 chipDate = gpu_read(gpu, VIVS_HI_CHIP_DATE);
> > +     gpu->identity.eco_id = gpu_read(gpu, VIVS_HI_CHIP_ECO_ID);
> > +
> > +     if (etnaviv_is_model_rev(gpu, GC1000, 0x5037) && (chipDate == 0x20120617))
> > +             gpu->identity.eco_id = 1;
> > +
> > +     if (etnaviv_is_model_rev(gpu, GC320, 0x5303) && (chipDate == 0x20140511))
> > +             gpu->identity.eco_id = 1;
>
> I'm not sure if those two checks warrant a separate function. Maybe
> just place them besides the other ID fixups?
>

This is almost a 1:1 copy of _GetEcoID(..) but will try to move the fixups.


> > +}
> > +
> >  static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
> >  {
> >       u32 chipIdentity;
> > @@ -362,6 +374,8 @@ static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
> >                       }
> >               }
> >
> > +             gpu->identity.product_id = gpu_read(gpu, VIVS_HI_CHIP_PRODUCT_ID);
> > +
> >               /*
> >                * NXP likes to call the GPU on the i.MX6QP GC2000+, but in
> >                * reality it's just a re-branded GC3000. We can identify this
> > @@ -375,6 +389,9 @@ static void etnaviv_hw_identify(struct etnaviv_gpu *gpu)
> >               }
> >       }
> >
> > +     etnaviv_hw_eco_id(gpu);
> > +     gpu->identity.customer_id = gpu_read(gpu, VIVS_HI_CHIP_CUSTOMER_ID);
>
> I don't like this scattering of identity register reads. Please move
> all of those reads to the else clause where we currently read
> model/rev. I doubt that the customer ID register is available on the
> really early cores, that only have the VIVS_HI_CHIP_IDENTITY register.
>

There is feature bit for it: chipMinorFeatures5_HAS_PRODUCTID
Will change the code to make use of it. Shall I still put it in the
else clause then?

--
greets
--
Christian Gmeiner, MSc

https://christian-gmeiner.info/privacypolicy