linux-kernel - Re: [PATCH v2] firmware: imx: Add support to start/stop a CPU

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Date:   Wed, 30 Jan 2019 20:46:35 +0800
From:   Dong Aisheng <dongas86@...il.com>
To:     Daniel Baluta <daniel.baluta@....com>
Cc:     "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "daniel.baluta@...il.com" <daniel.baluta@...il.com>,
        Aisheng Dong <aisheng.dong@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "S.j. Wang" <shengjiu.wang@....com>
Subject: Re: [PATCH v2] firmware: imx: Add support to start/stop a CPU

On Wed, Jan 30, 2019 at 5:59 PM Daniel Baluta <daniel.baluta@....com> wrote:
>
> This is done via RPC call to SCU.
>
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> ---
> Changes since v1:
>         - remove unused variable ret
>         - add documentation for imx_sc_pm_cpu_start function
>
>  drivers/firmware/imx/misc.c           | 38 +++++++++++++++++++++++++++
>  include/linux/firmware/imx/svc/misc.h |  3 +++
>  2 files changed, 41 insertions(+)
>
> diff --git a/drivers/firmware/imx/misc.c b/drivers/firmware/imx/misc.c
> index 97f5424dbac9..f511d6f624fd 100644
> --- a/drivers/firmware/imx/misc.c
> +++ b/drivers/firmware/imx/misc.c
> @@ -18,6 +18,14 @@ struct imx_sc_msg_req_misc_set_ctrl {
>         u16 resource;
>  } __packed;
>
> +struct imx_sc_msg_req_cpu_start {
> +       struct imx_sc_rpc_msg hdr;
> +       u32 address_hi;
> +       u32 address_lo;
> +       u16 resource;
> +       u8 enable;
> +} __packed;
> +
>  struct imx_sc_msg_req_misc_get_ctrl {
>         struct imx_sc_rpc_msg hdr;
>         u32 ctrl;
> @@ -97,3 +105,33 @@ int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
>         return 0;
>  }
>  EXPORT_SYMBOL(imx_sc_misc_get_control);
> +
> +/*
> + * This function starts/stops a CPU identified by @resource
> + *
> + * @param[in]     ipc         IPC handle
> + * @param[in]     resource    resource the control is associated with
> + * @param[in]     enable      true for start, false for stop
> + * @param[out]    address     initial instruction address to be executed
> + *
> + * @return Returns 0 for success and < 0 for errors.
> + */
> +int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
> +                       bool enable, u64 address)
> +{
> +       struct imx_sc_msg_req_cpu_start msg;
> +       struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +
> +       hdr->ver = IMX_SC_RPC_VERSION;
> +       hdr->svc = (uint8_t)IMX_SC_RPC_SVC_PM;
> +       hdr->func = (uint8_t)IMX_SC_PM_FUNC_CPU_START;

pls drop the unneccesary unit8_t

> +       hdr->size = 4;
> +
> +       msg.address_hi = address >> 32;
> +       msg.address_lo = address;
> +       msg.resource = resource;
> +       msg.enable = enable;
> +
> +       return imx_scu_call_rpc(ipc, &msg, false);

s/false/true

> +}
> +EXPORT_SYMBOL(imx_sc_pm_cpu_start);
> diff --git a/include/linux/firmware/imx/svc/misc.h b/include/linux/firmware/imx/svc/misc.h
> index e21c49aba92f..c03bf2a23add 100644
> --- a/include/linux/firmware/imx/svc/misc.h
> +++ b/include/linux/firmware/imx/svc/misc.h
> @@ -52,4 +52,7 @@ int imx_sc_misc_set_control(struct imx_sc_ipc *ipc, u32 resource,
>  int imx_sc_misc_get_control(struct imx_sc_ipc *ipc, u32 resource,
>                             u8 ctrl, u32 *val);
>
> +int imx_sc_pm_cpu_start(struct imx_sc_ipc *ipc, u32 resource,
> +                       bool enable, u64 address);

Nitpick: phy_addr

Otherwise, looks good to me.

Regards
Dong Aisheng

> +
>  #endif /* _SC_MISC_API_H */
> --
> 2.17.1
>