linux-kernel - RE: [EXT] Re: [net] net: mscc: ocelot: fix fields offset in SG_CONFIG_REG

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Date:   Thu, 24 Sep 2020 08:49:03 +0000
From:   Xiaoliang Yang <xiaoliang.yang_1@....com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "allan.nielsen@...rochip.com" <allan.nielsen@...rochip.com>,
        "joergen.andreasen@...rochip.com" <joergen.andreasen@...rochip.com>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        "fido_max@...ox.ru" <fido_max@...ox.ru>,
        Alexandru Marginean <alexandru.marginean@....com>,
        Po Liu <po.liu@....com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Leo Li <leoyang.li@....com>
Subject: RE: [EXT] Re: [net] net: mscc: ocelot: fix fields offset in
 SG_CONFIG_REG_3

Hi Alexandre,

On 24/09/2020 15:08:21+0800, Alexandre Belloni wrote:
> 
> Hi,
> 
> On 24/09/2020 10:11:13+0800, Xiaoliang Yang wrote:
> > INIT_IPS and GATE_ENABLE fields have a wrong offset in SG_CONFIG_REG_3.
> 
> You are changing GATE_STATE, not GATE_ENABLE
Oh, sorry, it should be GATE_STATE field.

> 
> > This register is used by stream gate control of PSFP, and it has not
> > been used before, because PSFP is not implemented in ocelot driver.
> >
> > Signed-off-by: Xiaoliang Yang <xiaoliang.yang_1@....com>
> > ---
> >  include/soc/mscc/ocelot_ana.h | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/include/soc/mscc/ocelot_ana.h
> > b/include/soc/mscc/ocelot_ana.h index 841c6ec22b64..1669481d9779
> > 100644
> > --- a/include/soc/mscc/ocelot_ana.h
> > +++ b/include/soc/mscc/ocelot_ana.h
> > @@ -252,10 +252,10 @@
> >  #define ANA_SG_CONFIG_REG_3_LIST_LENGTH_M
> GENMASK(18, 16)
> >  #define ANA_SG_CONFIG_REG_3_LIST_LENGTH_X(x)              (((x)
> & GENMASK(18, 16)) >> 16)
> >  #define ANA_SG_CONFIG_REG_3_GATE_ENABLE
> BIT(20)
> > -#define ANA_SG_CONFIG_REG_3_INIT_IPS(x)                   (((x) <<
> 24) & GENMASK(27, 24))
> > -#define ANA_SG_CONFIG_REG_3_INIT_IPS_M
> GENMASK(27, 24)
> > -#define ANA_SG_CONFIG_REG_3_INIT_IPS_X(x)                 (((x) &
> GENMASK(27, 24)) >> 24)
> > -#define ANA_SG_CONFIG_REG_3_INIT_GATE_STATE
> BIT(28)
> > +#define ANA_SG_CONFIG_REG_3_INIT_IPS(x)                   (((x) <<
> 21) & GENMASK(24, 21))
> > +#define ANA_SG_CONFIG_REG_3_INIT_IPS_M
> GENMASK(24, 21)
> > +#define ANA_SG_CONFIG_REG_3_INIT_IPS_X(x)                 (((x) &
> GENMASK(24, 21)) >> 21)
> > +#define ANA_SG_CONFIG_REG_3_INIT_GATE_STATE
> BIT(25)
> >
> 
> VSC7514 doesn't have the stream gate registers ans this was generated
> automatically from the cml file for felix. Did that change?
> 
> Seeing that bits in this register are not packed, I would believe your change is
> correct.
Yes, this register is in VSC9959, we need it in PSFP gate control function for felix in future. I have tested on VSC9959, the bit offsets are not correct.

Thanks,
Xiaoliang Yang