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Date:   Mon, 21 Sep 2020 19:50:50 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Loic Poulain <loic.poulain@...aro.org>
Cc:     hemantk@...eaurora.org, davem@...emloft.net,
        netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        bjorn.andersson@...aro.org
Subject: Re: [PATCH v2 1/2] bus: mhi: Remove auto-start option

On Mon, Sep 21, 2020 at 09:43:03AM +0200, Loic Poulain wrote:
> There is really no point having an auto-start for channels.
> This is confusing for the device drivers, some have to enable the
> channels, others don't have... and waste resources (e.g. pre allocated
> buffers) that may never be used.
> 
> This is really up to the MHI device(channel) driver to manage the state
> of its channels.
> 
> Signed-off-by: Loic Poulain <loic.poulain@...aro.org>

I need to hold this series for next merge window as this has the dependency
with ath11k driver and I'm not sure about the networking tree's merge window.

I'll merge this one and post patches to remove auto_start from ath11k mhi
driver for v5.11.

Thanks,
Mani

> ---
>  v2: split MHI and qrtr changes in dedicated commits
> 
>  drivers/bus/mhi/core/init.c     | 9 ---------
>  drivers/bus/mhi/core/internal.h | 1 -
>  include/linux/mhi.h             | 2 --
>  3 files changed, 12 deletions(-)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index dccc824..8798deb 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -721,7 +721,6 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
>  		mhi_chan->offload_ch = ch_cfg->offload_channel;
>  		mhi_chan->db_cfg.reset_req = ch_cfg->doorbell_mode_switch;
>  		mhi_chan->pre_alloc = ch_cfg->auto_queue;
> -		mhi_chan->auto_start = ch_cfg->auto_start;
>  
>  		/*
>  		 * If MHI host allocates buffers, then the channel direction
> @@ -1119,11 +1118,6 @@ static int mhi_driver_probe(struct device *dev)
>  			goto exit_probe;
>  
>  		ul_chan->xfer_cb = mhi_drv->ul_xfer_cb;
> -		if (ul_chan->auto_start) {
> -			ret = mhi_prepare_channel(mhi_cntrl, ul_chan);
> -			if (ret)
> -				goto exit_probe;
> -		}
>  	}
>  
>  	ret = -EINVAL;
> @@ -1157,9 +1151,6 @@ static int mhi_driver_probe(struct device *dev)
>  	if (ret)
>  		goto exit_probe;
>  
> -	if (dl_chan && dl_chan->auto_start)
> -		mhi_prepare_channel(mhi_cntrl, dl_chan);
> -
>  	mhi_device_put(mhi_dev);
>  
>  	return ret;
> diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
> index 5a81a42..73b52a0 100644
> --- a/drivers/bus/mhi/core/internal.h
> +++ b/drivers/bus/mhi/core/internal.h
> @@ -563,7 +563,6 @@ struct mhi_chan {
>  	bool configured;
>  	bool offload_ch;
>  	bool pre_alloc;
> -	bool auto_start;
>  	bool wake_capable;
>  };
>  
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index 811e686..0d277c7 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -214,7 +214,6 @@ enum mhi_db_brst_mode {
>   * @offload_channel: The client manages the channel completely
>   * @doorbell_mode_switch: Channel switches to doorbell mode on M0 transition
>   * @auto_queue: Framework will automatically queue buffers for DL traffic
> - * @auto_start: Automatically start (open) this channel
>   * @wake-capable: Channel capable of waking up the system
>   */
>  struct mhi_channel_config {
> @@ -232,7 +231,6 @@ struct mhi_channel_config {
>  	bool offload_channel;
>  	bool doorbell_mode_switch;
>  	bool auto_queue;
> -	bool auto_start;
>  	bool wake_capable;
>  };
>  
> -- 
> 2.7.4
> 

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