linux-kernel - Re: [PATCH v1 1/2] bus: mhi: host: Import link

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Date: Wed, 12 Jun 2024 10:03:14 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Slark Xiao <slark_xiao@....com>
Cc: loic.poulain@...aro.org, quic_qianyu@...cinc.com, mhi@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/2] bus: mhi: host: Import link_id item

On Fri, Jun 07, 2024 at 06:01:14PM +0800, Slark Xiao wrote:
> For SDX72 MBIM mode, it starts data mux id from 112 instead of 0.
> This would lead to device can't ping outside successfully.
> Also MBIM side would report "bad packet session (112)".
> So we add a link id default value for SDX72.
> 

link_id is WWAN specific. But what you are passing is essentially 'mux_id', so
just use the actual name.

> Signed-off-by: Slark Xiao <slark_xiao@....com>
> ---
>  drivers/bus/mhi/host/pci_generic.c | 3 +++
>  include/linux/mhi.h                | 1 +
>  2 files changed, 4 insertions(+)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 0b483c7c76a1..1f9de2730766 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -53,6 +53,7 @@ struct mhi_pci_dev_info {
>  	unsigned int dma_data_width;
>  	unsigned int mru_default;
>  	bool sideband_wake;
> +	unsigned int link_default;
>  };
>  
>  #define MHI_CHANNEL_CONFIG_UL(ch_num, ch_name, el_count, ev_ring) \
> @@ -469,6 +470,7 @@ static const struct mhi_pci_dev_info mhi_foxconn_sdx72_info = {
>  	.dma_data_width = 32,
>  	.mru_default = 32768,
>  	.sideband_wake = false,
> +	.link_default = 112,

Just use 'mux_id' here also.

>  };
>  
>  static const struct mhi_channel_config mhi_mv3x_channels[] = {
> @@ -1035,6 +1037,7 @@ static int mhi_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  	mhi_cntrl->runtime_get = mhi_pci_runtime_get;
>  	mhi_cntrl->runtime_put = mhi_pci_runtime_put;
>  	mhi_cntrl->mru = info->mru_default;
> +	mhi_cntrl->link_id = info->link_default;
>  
>  	if (info->edl_trigger)
>  		mhi_cntrl->edl_trigger = mhi_pci_generic_edl_trigger;
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index b573f15762f8..4da10b99c96e 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -445,6 +445,7 @@ struct mhi_controller {
>  	bool wake_set;
>  	unsigned long irq_flags;
>  	u32 mru;
> +	u32 link_id;

Add kdoc comment.

- Mani

-- 
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