netdev - Re: [PATCH v2 1/2] bus: mhi: host: Import mux

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Date: Wed, 12 Jun 2024 15:16:09 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Slark Xiao <slark_xiao@....com>
Cc: loic.poulain@...aro.org, ryazanov.s.a@...il.com,
	johannes@...solutions.net, quic_jhugo@...cinc.com,
	netdev@...r.kernel.org, mhi@...ts.linux.dev,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] bus: mhi: host: Import mux_id item

On Wed, Jun 12, 2024 at 05:38:42PM +0800, Slark Xiao wrote:

Subject could be improved:

bus: mhi: host: Add configurable mux_id for MBIM mode

> 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 default mux_id value for SDX72. And this value
> would be transferred to wwan mbim side.
> 
> Signed-off-by: Slark Xiao <slark_xiao@....com>
> ---
>  drivers/bus/mhi/host/pci_generic.c | 3 +++
>  include/linux/mhi.h                | 2 ++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 0b483c7c76a1..9e9adf8320d2 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 mux_id;
>  };
>  
>  #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,
> +	.mux_id = 112,
>  };
>  
>  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->mux_id;

Again, 'link_id' is just a WWAN term. Use 'mux_id' here also.

- Mani

-- 
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