linux-kernel - Re: [PATCH v5 1/9] bus: mhi: core: Allow sending the STOP channel command

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Message-ID: <20210121112515.GE30041@thinkpad>
Date:   Thu, 21 Jan 2021 16:55:15 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Bhaumik Bhatt <bbhatt@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org
Subject: Re: [PATCH v5 1/9] bus: mhi: core: Allow sending the STOP channel
 command

On Fri, Jan 08, 2021 at 12:54:49PM -0800, Bhaumik Bhatt wrote:
> Add support to allow sending the STOP channel command. If a
> client driver would like to STOP a channel and have the device
> retain the channel context instead of issuing a RESET to it and
> clearing the context, this would provide support for it after
> the ability to send this command is exposed to clients.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> Reviewed-by: Hemant Kumar <hemantk@...eaurora.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  drivers/bus/mhi/core/main.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> index 8576b0f..c22d7df 100644
> --- a/drivers/bus/mhi/core/main.c
> +++ b/drivers/bus/mhi/core/main.c
> @@ -1224,6 +1224,11 @@ int mhi_send_cmd(struct mhi_controller *mhi_cntrl,
>  		cmd_tre->dword[0] = MHI_TRE_CMD_RESET_DWORD0;
>  		cmd_tre->dword[1] = MHI_TRE_CMD_RESET_DWORD1(chan);
>  		break;
> +	case MHI_CMD_STOP_CHAN:
> +		cmd_tre->ptr = MHI_TRE_CMD_STOP_PTR;
> +		cmd_tre->dword[0] = MHI_TRE_CMD_STOP_DWORD0;
> +		cmd_tre->dword[1] = MHI_TRE_CMD_STOP_DWORD1(chan);
> +		break;
>  	case MHI_CMD_START_CHAN:
>  		cmd_tre->ptr = MHI_TRE_CMD_START_PTR;
>  		cmd_tre->dword[0] = MHI_TRE_CMD_START_DWORD0;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>