linux-kernel - Re: [PATCH v3 2/3] iommu/mediatek: add support for 6-bit encoded port IDs

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Message-ID: <54d3b706-6f5b-d5ec-82ca-45b9f4995d13@collabora.com>
Date:   Tue, 11 Oct 2022 11:55:03 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Alexandre Mergnat <amergnat@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Joerg Roedel <joro@...tes.org>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will@...nel.org>, Yong Wu <yong.wu@...iatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     iommu@...ts.linux.dev, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Fabien Parent <fparent@...libre.com>,
        Markus Schneider-Pargmann <msp@...libre.com>,
        Amjad Ouled-Ameur <aouledameur@...libre.com>,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v3 2/3] iommu/mediatek: add support for 6-bit encoded port
 IDs

Il 10/10/22 14:54, Alexandre Mergnat ha scritto:
> From: Fabien Parent <fparent@...libre.com>
> 
> Until now the port ID was always encoded as a 5-bit data. On MT8365,
> the port ID is encoded as a 6-bit data. This requires to add extra
> macro F_MMU_INT_ID_LARB_ID_EXT, and F_MMU_INT_ID_PORT_ID_EXT in order
> to support 6-bit encoded port IDs.
> 
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> Signed-off-by: Markus Schneider-Pargmann <msp@...libre.com>
> Signed-off-by: Alexandre Mergnat <amergnat@...libre.com>
> ---
>   drivers/iommu/mtk_iommu.c | 17 +++++++++++++++--
>   1 file changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index 5a4e00e4bbbc..35e9731c3441 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -108,8 +108,12 @@
>   #define F_MMU_INT_ID_SUB_COMM_ID(a)		(((a) >> 7) & 0x3)
>   #define F_MMU_INT_ID_COMM_ID_EXT(a)		(((a) >> 10) & 0x7)
>   #define F_MMU_INT_ID_SUB_COMM_ID_EXT(a)		(((a) >> 7) & 0x7)
> +/* Macro for 5 bits lenght port ID field (default) */

Typo: s/lenght/length/g

>   #define F_MMU_INT_ID_LARB_ID(a)			(((a) >> 7) & 0x7)
>   #define F_MMU_INT_ID_PORT_ID(a)			(((a) >> 2) & 0x1f)
> +/* Macro for 6 bits lenght port ID field */

Same here.

After fixing that:
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>