linux-kernel - Re: [PATCH net-next v4 1/3] net: macb: Update gem PTP support check

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Date:   Thu, 30 Mar 2023 10:06:42 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Harini Katakam <harini.katakam@....com>
Cc:     nicolas.ferre@...rochip.com, davem@...emloft.net,
        richardcochran@...il.com, claudiu.beznea@...rochip.com,
        andrei.pistirica@...rochip.com, kuba@...nel.org,
        edumazet@...gle.com, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, michal.simek@....com,
        harinikatakamlinux@...il.com
Subject: Re: [PATCH net-next v4 1/3] net: macb: Update gem PTP support check

On Thu, Mar 30, 2023 at 10:38:07AM +0530, Harini Katakam wrote:
> There are currently two checks for PTP functionality - one on GEM
> capability and another on the kernel config option. Combine them
> into a single function as there's no use case where gem_has_ptp is
> TRUE and MACB_USE_HWSTAMP is false.
> 
> Signed-off-by: Harini Katakam <harini.katakam@....com>
> ---
> v4:
> Fixed error introduced in 1/3 in v3:
> Reported-by: kernel test robot <lkp@...el.com>
> Link: https://lore.kernel.org/oe-kbuild-all/202303280600.LarprmhI-lkp@intel.com/
> v3:
> New patch
> 
>  drivers/net/ethernet/cadence/macb.h      | 2 +-
>  drivers/net/ethernet/cadence/macb_main.c | 4 ++--
>  2 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
> index c1fc91c97cee..b6c5ecbd572c 100644
> --- a/drivers/net/ethernet/cadence/macb.h
> +++ b/drivers/net/ethernet/cadence/macb.h
> @@ -1363,7 +1363,7 @@ static inline bool macb_is_gem(struct macb *bp)
>  
>  static inline bool gem_has_ptp(struct macb *bp)
>  {
> -	return !!(bp->caps & MACB_CAPS_GEM_HAS_PTP);
> +	return (IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && (!!(bp->caps & MACB_CAPS_GEM_HAS_PTP)));

Brackets and double !! are not needed.

return IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && (bp->caps & MACB_CAPS_GEM_HAS_PTP);

>  }
>  
>  /**
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index f77bd1223c8f..eab2d41fa571 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -3889,17 +3889,17 @@ static void macb_configure_caps(struct macb *bp,
>  		dcfg = gem_readl(bp, DCFG2);
>  		if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
>  			bp->caps |= MACB_CAPS_FIFO_MODE;
> -#ifdef CONFIG_MACB_USE_HWSTAMP
>  		if (gem_has_ptp(bp)) {
>  			if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5)))
>  				dev_err(&bp->pdev->dev,
>  					"GEM doesn't support hardware ptp.\n");
>  			else {
> +#ifdef CONFIG_MACB_USE_HWSTAMP
>  				bp->hw_dma_cap |= HW_DMA_CAP_PTP;
>  				bp->ptp_info = &gem_ptp_info;
> +#endif
>  			}
>  		}
> -#endif
>  	}
>  
>  	dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
> -- 
> 2.17.1
>