netdev - Re: [PATCH 01/13] soc/fsl/qman: fixup liodns only on ppc targets

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Message-ID: <CADRPPNQ9AGRvq8XDjeTerUBry+_hO-U=shCXFaqHhtc9QvMvng@mail.gmail.com>
Date:   Fri, 29 Mar 2019 16:50:23 -0500
From:   Li Yang <leoyang.li@....com>
To:     Laurentiu Tudor <laurentiu.tudor@....com>
Cc:     Netdev <netdev@...r.kernel.org>, madalin.bucur@....com,
        Roy Pledge <roy.pledge@....com>, camelia.groza@....com,
        David Miller <davem@...emloft.net>,
        Linux IOMMU <iommu@...ts.linux-foundation.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 01/13] soc/fsl/qman: fixup liodns only on ppc targets

On Fri, Mar 29, 2019 at 9:01 AM <laurentiu.tudor@....com> wrote:
>
> From: Laurentiu Tudor <laurentiu.tudor@....com>
>
> ARM SoCs use SMMU so the liodn fixup done in the qman driver is no
> longer making sense and it also breaks the ICID settings inherited
> from u-boot. Do the fixups only for PPC targets.
>
> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
> ---
>  drivers/soc/fsl/qbman/qman_ccsr.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/soc/fsl/qbman/qman_ccsr.c b/drivers/soc/fsl/qbman/qman_ccsr.c
> index 109b38de3176..12e414ca3b03 100644
> --- a/drivers/soc/fsl/qbman/qman_ccsr.c
> +++ b/drivers/soc/fsl/qbman/qman_ccsr.c
> @@ -598,6 +598,7 @@ static int qman_init_ccsr(struct device *dev)
>  #define LIO_CFG_LIODN_MASK 0x0fff0000
>  void qman_liodn_fixup(u16 channel)
>  {
> +#ifdef CONFIG_PPC
>         static int done;
>         static u32 liodn_offset;
>         u32 before, after;
> @@ -617,6 +618,7 @@ void qman_liodn_fixup(u16 channel)
>                 qm_ccsr_out(REG_REV3_QCSP_LIO_CFG(idx), after);
>         else
>                 qm_ccsr_out(REG_QCSP_LIO_CFG(idx), after);
> +#endif

According to the Linux coding style recommendation, it would be better
to put the #ifdef into the header files
"drivers/soc/fsl/qbman/qman_priv.h".  And I'm not sure if this is
needed on PPC when IOMMU(PAMU) driver is not compiled, if not,
probably using CONFIG_PAMU as condition would be even better.

>  }
>
>  #define IO_CFG_SDEST_MASK 0x00ff0000
> --
> 2.17.1
>