netdev - Re: [PATCH 2/2] net: macb: Update tsu clk usage in runtime suspend/resume for Versal

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Date:   Fri, 22 Jul 2022 16:04:33 +0530
From:   Harini Katakam <harinik@...inx.com>
To:     Claudiu Beznea <Claudiu.Beznea@...rochip.com>
Cc:     Harini Katakam <harini.katakam@...inx.com>,
        Nicolas Ferre <Nicolas.Ferre@...rochip.com>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, edumazet@...gle.com,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        krzysztof.kozlowski+dt@...aro.org, netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Simek <michal.simek@...inx.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
Subject: Re: [PATCH 2/2] net: macb: Update tsu clk usage in runtime
 suspend/resume for Versal

Hi Claudiu,

On Fri, Jul 22, 2022 at 1:55 PM <Claudiu.Beznea@...rochip.com> wrote:
>
> On 20.07.2022 14:29, Harini Katakam wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >
> > On Versal TSU clock cannot be disabled irrespective of whether PTP is
> > used. Hence introduce a new Versal config structure with a "need tsu"
> > caps flag and check the same in runtime_suspend/resume before cutting
> > off clocks.
> >
> > More information on this for future reference:
> > This is an IP limitation on versions 1p11 and 1p12 when Qbv is enabled
> > (See designcfg1, bit 3). However it is better to rely on an SoC specific
> > check rather than the IP version because tsu clk property itself may not
> > represent actual HW tsu clock on some chip designs.
> >
> > Signed-off-by: Harini Katakam <harini.katakam@...inx.com>
> > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@...inx.com>
> > ---
> >  drivers/net/ethernet/cadence/macb.h      |  1 +
> >  drivers/net/ethernet/cadence/macb_main.c | 17 +++++++++++++++--
> >  2 files changed, 16 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> > index 7ca077b65eaa..8bf67b44b466 100644
> > --- a/drivers/net/ethernet/cadence/macb.h
> > +++ b/drivers/net/ethernet/cadence/macb.h
> > @@ -725,6 +725,7 @@
> >  #define MACB_CAPS_MACB_IS_GEM                  0x80000000
> >  #define MACB_CAPS_PCS                          0x01000000
> >  #define MACB_CAPS_HIGH_SPEED                   0x02000000
> > +#define MACB_CAPS_NEED_TSUCLK                  0x00001000
>
> Can you keep this sorted by the bit position used?

Thanks for the review.
Sure, I'll sort these in a separate patch first in the same series.

>
> >
> >  /* LSO settings */
> >  #define MACB_LSO_UFO_ENABLE                    0x01
> > diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> > index 7eb7822cd184..8bbc46e8a9eb 100644
> > --- a/drivers/net/ethernet/cadence/macb_main.c
> > +++ b/drivers/net/ethernet/cadence/macb_main.c
> > @@ -4735,6 +4735,16 @@ static const struct macb_config zynqmp_config = {
> >         .usrio = &macb_default_usrio,
> >  };
> >
> > +static const struct macb_config versal_config = {
> > +       .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO |
> > +               MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH | MACB_CAPS_NEED_TSUCLK,
> > +       .dma_burst_length = 16,
> > +       .clk_init = macb_clk_init,
> > +       .init = init_reset_optional,
> > +       .jumbo_max_len = 10240,
> > +       .usrio = &macb_default_usrio,
> > +};
> > +
>
> Also, could you keep this not b/w zynq configs to have a bit of sort of these?
>
> Other than this:
>
> Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

Thanks.

Regards,
Harini