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

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Date:   Wed, 8 Jan 2020 18:30:31 +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 Johnson,

On Wed, 8 Jan 2020 at 09:15, Johnson CH Chen (陳昭勳)
<JohnsonCH.Chen@...a.com> wrote:
>
> Hi Vladimir,
>
> Vladimir Oltean <olteanv@...il.com> 於 2020年1月7日 週二 下午11:49寫道：
> >
> > 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.
> >
>
> Thanks your suggestion. I use linux-fsl-sdk-v1.7, and find "dma-endian-le" is used in ls1021a.dtsi and gianfar.c/.h. For bootloader, version is U-Boot version is 2015.01-dirty and it seems old and not includes "SCFG_ETSECDMAMCR bits".
>
> It seems solution is included in bootloader, not in device tree for
> freescale/NXP: https://lxr.missinglinkelectronics.com/uboot/board/freescale/ls1021aiot/ls1021aiot.c
>
> It means bootloader provides functions are the same as device tree's.
> So what's benefit for this desgin? It seems we need to upgrade kernel and bootloader to satisfy our need, not just upgrade kernel only. So many thanks!
>

I'm not sure that the Freescale SDK 1.7 is of any relevance here. The
point is that this patch is breaking Ethernet for every other LS1021A
board except yours.

Regards,
-Vladimir