linux-kernel - Re: [RESEND PATCH 4/4] EDAC: add support for reduced-width Armada-XP SDRAM

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Date:   Fri, 11 Aug 2017 11:14:02 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Chris Packham <chris.packham@...iedtelesis.co.nz>
Cc:     robh+dt@...nel.org, gregory.clement@...e-electrons.com,
        jlu@...gutronix.de, linux-arm-kernel@...ts.infradead.org,
        linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: [RESEND PATCH 4/4] EDAC: add support for reduced-width Armada-XP
 SDRAM

On Mon, Aug 07, 2017 at 01:46:41PM +1200, Chris Packham wrote:
> Some integrated Armada XP SoCs use a reduced pin count so the width of
> the SDRAM interface is smaller than the traditional discrete SoCs. This
> means that the definition of "full" and "half" width is further reduced.
> 
> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
> ---
>  drivers/edac/armada_xp_edac.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/edac/armada_xp_edac.c b/drivers/edac/armada_xp_edac.c
> index 68e88b180928..d8edcaac87c0 100644
> --- a/drivers/edac/armada_xp_edac.c
> +++ b/drivers/edac/armada_xp_edac.c
> @@ -350,6 +350,9 @@ static int armada_xp_mc_edac_probe(struct platform_device *pdev)
>  	if (armada_xp_mc_edac_read_config(mci))
>  		return -EINVAL;
>  
> +	if (of_property_read_bool(pdev->dev.of_node, "marvell,reduced-width"))
> +		drvdata->width /= 2;

If the compiler doesn't already convert it to a shift on ARM, you
probably should do

		>>= 1;

here, just in case.

With that you can add my

Acked-by: Borislav Petkov <bp@...e.de>

and route it through an ARM tree.

Thx.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--