linux-kernel - Re: [RFC/PATCH v2 09/16] soc: bcm: bcm2835-power: Add support for BCM2711's Argon ASB

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Date:   Tue, 09 Feb 2021 15:00:18 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Phil Elwell <phil@...pberrypi.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        linux-kernel@...r.kernel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>, wahrenst@....net,
        linux-arm-kernel@...ts.infradead.org, mripard@...nel.org,
        eric@...olt.net
Subject: Re: [RFC/PATCH v2 09/16] soc: bcm: bcm2835-power: Add support for
 BCM2711's Argon ASB

On Tue, 2021-02-09 at 13:19 +0000, Phil Elwell wrote:
> Hi Nicolas,
> 
> On Tue, 9 Feb 2021 at 13:00, Nicolas Saenz Julienne
> <nsaenzjulienne@...e.de> wrote:
> > 
> > In BCM2711 the new ARGON ASB took over V3D. The old ASB is still present
> > with the ISP and H264 bits, and V3D is in the same place in the new ASB
> > as the old one.
> > 
> > Use the fact that 'pm->argon_asb' is populated as a hint that we're on
> > BCM2711. On top of that introduce the macro ASB_BASE() which will select
> > the correct ASB register base, based on whether we're trying to access
> > V3D and which platform we're on.
> 
> Please don't refer to this block as ARGON - it is the IP of Raspberry
> Pi Trading and it's name is RPiVid.

OK, sorry for that. I, again, mixed both ASB names. I'll rename the Argon ASB
to RPiVid. How should I call the one present in older RPis?

> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
> > 
> > ---
> > 
> > Changes since v1:
> >  - Correct names
> > 
> >  drivers/soc/bcm/bcm2835-power.c | 68 ++++++++++++++++++++-------------
> >  1 file changed, 42 insertions(+), 26 deletions(-)
> > 
> > diff --git a/drivers/soc/bcm/bcm2835-power.c b/drivers/soc/bcm/bcm2835-power.c
> > index 59b8abfc5617..42e105758b47 100644
> > --- a/drivers/soc/bcm/bcm2835-power.c

[...]

> >         case BCM2835_POWER_DOMAIN_USB:
> >                 PM_WRITE(PM_USB, 0);
> > @@ -626,13 +633,22 @@ static int bcm2835_power_probe(struct platform_device *pdev)
> >         power->dev = dev;
> >         power->base = pm->base;
> >         power->rpivid_asb = pm->rpivid_asb;
> > +       power->argon_asb = pm->argon_asb;
> > 
> > -       id = ASB_READ(ASB_AXI_BRDG_ID);
> > +       id = ASB_READ(ASB_AXI_BRDG_ID, false);
> >         if (id != 0x62726467 /* "BRDG" */) {
> > -               dev_err(dev, "ASB register ID returned 0x%08x\n", id);
> > +               dev_err(dev, "RPiVid ASB register ID returned 0x%08x\n", id);
> >                 return -ENODEV;
> >         }
> > 
> > +       if (pm->argon_asb) {
> > +               id = ASB_READ(ASB_AXI_BRDG_ID, true);
> > +               if (id != 0x62726467 /* "BRDG" */) {
> > +                       dev_err(dev, "Argon ASB register ID returned 0x%08x\n", id);
> > +                       return -ENODEV;
> > +               }
> > +       }
> > +
>
> Surely these are the same register. Is this the result of a bad merge?

AFAIU There are two ASBs the old one at 0x7e00a000 and the new RPiVid one at
0x7ec11000. They both can be checked for valid IDs. Note the new argument in
ASB_READ().

Regards,
Nicolas


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