linux-kernel - Re: [PATCH v13 07/11] remoteproc: mediatek: Add scp_boot_peers and scp_shutdown

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Message-ID: <3024a2a8-8e64-dfab-a9a3-0d4f51b345d9@collabora.com>
Date:   Wed, 7 Jun 2023 09:49:32 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Tinghan Shen <tinghan.shen@...iatek.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v13 07/11] remoteproc: mediatek: Add scp_boot_peers and
 scp_shutdown_peers operations

Il 07/06/23 09:22, Tinghan Shen ha scritto:
> Due to that SCP core 0 controls the SCP clock and SRAM power, add two
> new mtk_scp_of_data operations, scp_boot_peers and scp_shutdown_peers,
> to manage the boot sequence and watchdog timeout handling of SCP core 1.
> It ensures that core 1 boots after or shuts down before core 0 for
> maintaining the proper control flow over SCP core 1.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> ---
>   drivers/remoteproc/mtk_common.h |  3 ++
>   drivers/remoteproc/mtk_scp.c    | 55 +++++++++++++++++++++++++++++++++
>   2 files changed, 58 insertions(+)
> 
> diff --git a/drivers/remoteproc/mtk_common.h b/drivers/remoteproc/mtk_common.h
> index 56395e8664cb..0bfd242c41cc 100644
> --- a/drivers/remoteproc/mtk_common.h
> +++ b/drivers/remoteproc/mtk_common.h
> @@ -93,6 +93,8 @@ struct mtk_scp_of_data {
>   	void (*scp_reset_deassert)(struct mtk_scp *scp);
>   	void (*scp_stop)(struct mtk_scp *scp);
>   	void *(*scp_da_to_va)(struct mtk_scp *scp, u64 da, size_t len);
> +	void (*scp_boot_peers)(struct mtk_scp *scp);
> +	void (*scp_shutdown_peers)(struct mtk_scp *scp);
>   
>   	u32 host_to_scp_reg;
>   	u32 host_to_scp_int_bit;
> @@ -130,6 +132,7 @@ struct mtk_scp {
>   	struct rproc_subdev *rpmsg_subdev;
>   
>   	struct list_head elem;
> +	struct list_head *cluster;
>   };
>   
>   /**
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index d644e232dfec..edbf71f4c21e 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -74,8 +74,21 @@ void scp_put(struct mtk_scp *scp)
>   }
>   EXPORT_SYMBOL_GPL(scp_put);
>   
> +static void mt8195_scp_shutdown_peers(struct mtk_scp *scp)
> +{
> +	struct mtk_scp *next_scp;
> +
> +	next_scp = list_next_entry(scp, elem);
> +	list_for_each_entry_from(next_scp, scp->cluster, elem) {
> +		rproc_shutdown(next_scp->rproc);
> +	}

braces are not needed here; after fixing that,

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