linux-kernel - Re: [PATCH v1 1/2] bus: mhi: core: Count number of HW channels supported by controller

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Date:   Fri, 6 Nov 2020 13:30:14 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Hemant Kumar <hemantk@...eaurora.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        jhugo@...eaurora.org, bbhatt@...eaurora.org,
        loic.poulain@...aro.org
Subject: Re: [PATCH v1 1/2] bus: mhi: core: Count number of HW channels
 supported by controller

On Fri, Oct 23, 2020 at 07:00:42PM -0700, Hemant Kumar wrote:
> Device provides the total number of HW channels it supports using MHI
> configuration register. Host supported HW channels shall not exceed
> that value. In order to make this check, a counter is needed to store
> total number of HW channels required by host.
> 
> Signed-off-by: Hemant Kumar <hemantk@...eaurora.org>
> ---
>  drivers/bus/mhi/core/init.c     | 2 ++
>  drivers/bus/mhi/core/internal.h | 1 +
>  include/linux/mhi.h             | 1 +
>  3 files changed, 4 insertions(+)
> 
> diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c
> index 0ffdebd..70fd6af 100644
> --- a/drivers/bus/mhi/core/init.c
> +++ b/drivers/bus/mhi/core/init.c
> @@ -725,6 +725,8 @@ static int parse_ch_cfg(struct mhi_controller *mhi_cntrl,
>  		mhi_chan = &mhi_cntrl->mhi_chan[chan];
>  		mhi_chan->name = ch_cfg->name;
>  		mhi_chan->chan = chan;
> +		if (chan >= MHI_HW_CHAN_START_IDX)
> +			mhi_cntrl->hw_chan++;
>  
>  		mhi_chan->tre_ring.elements = ch_cfg->num_elements;
>  		if (!mhi_chan->tre_ring.elements)
> diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h
> index 7989269..3d8e480 100644
> --- a/drivers/bus/mhi/core/internal.h
> +++ b/drivers/bus/mhi/core/internal.h
> @@ -454,6 +454,7 @@ enum mhi_pm_state {
>  #define PRIMARY_CMD_RING		0
>  #define MHI_DEV_WAKE_DB			127
>  #define MHI_MAX_MTU			0xffff
> +#define MHI_HW_CHAN_START_IDX		100
>  #define MHI_RANDOM_U32_NONZERO(bmsk)	(prandom_u32_max(bmsk) + 1)
>  
>  enum mhi_er_type {
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index d4841e5..ea441d2 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -389,6 +389,7 @@ struct mhi_controller {
>  	struct list_head lpm_chans;
>  	int *irq;
>  	u32 max_chan;
> +	u32 hw_chan;

Please add Kdoc for this member. With that,

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

Thanks,
Mani

>  	u32 total_ev_rings;
>  	u32 hw_ev_rings;
>  	u32 sw_ev_rings;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>