linux-kernel - Re: [PATCH v2 1/6] bus: mhi: core: Allow receiving a STOP channel command response

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Date:   Mon, 16 Nov 2020 12:43:39 +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, loic.poulain@...aro.org,
        kvalo@...eaurora.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/6] bus: mhi: core: Allow receiving a STOP channel
 command response

On Wed, Nov 11, 2020 at 11:21:08AM -0800, Bhaumik Bhatt wrote:
> Add support to receive the response to a STOP channel command to the
> MHI bus. If a client would like to STOP a channel instead of issuing
> a RESET to it, this would provide support for it.
> 
> Signed-off-by: Bhaumik Bhatt <bbhatt@...eaurora.org>
> ---
>  drivers/bus/mhi/core/init.c | 5 +++--
>  drivers/bus/mhi/core/main.c | 5 +++++
>  2 files changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 8cefa35..4d34d62 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -1267,8 +1267,9 @@ static int mhi_driver_remove(struct device *dev)
>  
>  		mutex_lock(&mhi_chan->mutex);
>  
> -		if (ch_state[dir] == MHI_CH_STATE_ENABLED &&
> -		    !mhi_chan->offload_ch)
> +		if ((ch_state[dir] == MHI_CH_STATE_ENABLED ||
> +		     ch_state[dir] == MHI_CH_STATE_STOP) &&

This enum is not defined in this patch so it'll break. Please add a separate
patch which introduces the new state enums alone and then have patches 1/2
as a followup.

Also this change is not belonging to this commit I believe.

Thanks,
Mani

> +		     !mhi_chan->offload_ch)
>  			mhi_deinit_chan_ctxt(mhi_cntrl, mhi_chan);
>  
>  		mhi_chan->ch_state = MHI_CH_STATE_DISABLED;
> diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c
> index f953e2a..ad881a1 100644
> --- a/drivers/bus/mhi/core/main.c
> +++ b/drivers/bus/mhi/core/main.c
> @@ -1194,6 +1194,11 @@ 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
>