linux-kernel - Re: [PATCH net-next v1 1/1] net: stmmac: xgmac: Enable support for multiple Flexible PPS outputs

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Date:   Fri, 27 Oct 2023 14:43:34 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Furong Xu <0x1207@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Joao Pinto <jpinto@...opsys.com>,
        Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        xfr@...look.com, rock.xu@....com
Subject: Re: [PATCH net-next v1 1/1] net: stmmac: xgmac: Enable support for
 multiple Flexible PPS outputs

On Thu, Oct 26, 2023 at 05:48:56PM +0800, Furong Xu wrote:
> From XGMAC Core 3.20 and later, each Flexible PPS has individual PPSEN bit
> to select Fixed mode or Flexible mode. The PPSEN must be set, or it stays
> in Fixed PPS mode by default.

Are you sure 3.10a don't have the PPSEN flag available for all
outputs too?

> XGMAC Core prior 3.20, corresponding PPSEN bits are read-only reserved,
> always set PPSEN do not make things worse ;)
> 
> Signed-off-by: Furong Xu <0x1207@...il.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h      | 2 +-
>  drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> index 7a8f47e7b728..a4e8b498dea9 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> @@ -259,7 +259,7 @@
>  	((val) << XGMAC_PPS_MINIDX(x))
>  #define XGMAC_PPSCMD_START		0x2
>  #define XGMAC_PPSCMD_STOP		0x5
> -#define XGMAC_PPSEN0			BIT(4)
> +#define XGMAC_PPSENx(x)			BIT(4 + (x) * 8)
>  #define XGMAC_PPSx_TARGET_TIME_SEC(x)	(0x00000d80 + (x) * 0x10)
>  #define XGMAC_PPSx_TARGET_TIME_NSEC(x)	(0x00000d84 + (x) * 0x10)
>  #define XGMAC_TRGTBUSY0			BIT(31)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
> index f352be269deb..53bb8f16c481 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
> @@ -1178,7 +1178,7 @@ static int dwxgmac2_flex_pps_config(void __iomem *ioaddr, int index,
>  
>  	val |= XGMAC_PPSCMDx(index, XGMAC_PPSCMD_START);
>  	val |= XGMAC_TRGTMODSELx(index, XGMAC_PPSCMD_START);
> -	val |= XGMAC_PPSEN0;

> +	val |= XGMAC_PPSENx(index);

At the very least it would be nice to have a comment here that the
mode selection was available for the output #0 only in the IP-cores
prior v3.20a with the outputs 1-3 always working as flexible PPS
outputs.

Other than that no more comments:
Reviewed-by: Serge Semin <fancer.lancer@...il.com>

-Serge(y)

>  
>  	writel(cfg->start.tv_sec, ioaddr + XGMAC_PPSx_TARGET_TIME_SEC(index));
>  
> -- 
> 2.34.1
> 
>