linux-kernel - Re: [PATCH] gianfar: Solve ethernet TX/RX problems for ls1021a

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Date:   Tue, 7 Jan 2020 17:49:12 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     Johnson CH Chen (陳昭勳) 
        <JohnsonCH.Chen@...a.com>
Cc:     "claudiu.manoil@....com" <claudiu.manoil@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "zero19850401@...il.com" <zero19850401@...il.com>
Subject: Re: [PATCH] gianfar: Solve ethernet TX/RX problems for ls1021a

Hi Chen,

On Tue, 7 Jan 2020 at 12:37, Johnson CH Chen (陳昭勳)
<JohnsonCH.Chen@...a.com> wrote:
>
> Add dma_endian_le to solve ethernet TX/RX problems for freescale ls1021a. Without this, it will result in
> rx-busy-errors by ethtool, and transmit queue timeout in ls1021a's platforms.
>
> Signed-off-by: Johnson Chen <johnsonch.chen@...a.com>
> ---

This patch is not valid. The endianness configuration in
eTSECx_DMACTRL is reserved and not applicable.
What is the value of SCFG_ETSECDMAMCR bits ETSEC_BD and ETSEC_FR_DATA
on your board? Typically this is configured by the bootloader.

>  drivers/net/ethernet/freescale/gianfar.c | 3 +++
>  drivers/net/ethernet/freescale/gianfar.h | 4 ++++
>  2 files changed, 7 insertions(+)
>
> diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
> index 72868a28b621..ab4e45199df9 100644
> --- a/drivers/net/ethernet/freescale/gianfar.c
> +++ b/drivers/net/ethernet/freescale/gianfar.c
> @@ -833,6 +833,7 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
>
>         /* Find the TBI PHY.  If it's not there, we don't support SGMII */
>         priv->tbi_node = of_parse_phandle(np, "tbi-handle", 0);
> +       priv->dma_endian_le = of_property_read_bool(np, "fsl,dma-endian-le");
>
>         return 0;
>
> @@ -1209,6 +1210,8 @@ static void gfar_start(struct gfar_private *priv)
>         /* Initialize DMACTRL to have WWR and WOP */
>         tempval = gfar_read(&regs->dmactrl);
>         tempval |= DMACTRL_INIT_SETTINGS;
> +       if (priv->dma_endian_le)
> +               tempval |= DMACTRL_LE;
>         gfar_write(&regs->dmactrl, tempval);
>
>         /* Make sure we aren't stopped */
> diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
> index 432c6a818ae5..aae07db5206b 100644
> --- a/drivers/net/ethernet/freescale/gianfar.h
> +++ b/drivers/net/ethernet/freescale/gianfar.h
> @@ -215,6 +215,7 @@ extern const char gfar_driver_version[];
>  #define DMACTRL_INIT_SETTINGS   0x000000c3
>  #define DMACTRL_GRS             0x00000010
>  #define DMACTRL_GTS             0x00000008
> +#define DMACTRL_LE             0x00008000
>
>  #define TSTAT_CLEAR_THALT_ALL  0xFF000000
>  #define TSTAT_CLEAR_THALT      0x80000000
> @@ -1140,6 +1141,9 @@ struct gfar_private {
>                 tx_pause_en:1,
>                 rx_pause_en:1;
>
> +       /* little endian dma buffer and descriptor host interface */
> +       unsigned int dma_endian_le;
> +
>         /* The total tx and rx ring size for the enabled queues */
>         unsigned int total_tx_ring_size;
>         unsigned int total_rx_ring_size;
> --
> 2.11.0
>
> Best regards,
> Johnson

Regards,
-Vladimir