linux-kernel - Re: [PATCH] bus: mhi: host: pci_generic: Add Quectel RM520N-GLAP to pci id table

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Message-ID: <7fsulhs6l5j7gg4oy3hww6xpg5rlq7msxfixpa3zbsd4ejmymw@dk67avi3vn6i>
Date: Mon, 18 Aug 2025 13:49:35 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Michael Fritscher <michael@...tscher.net>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org, duke_xinanwen@....com
Subject: Re: [PATCH] bus: mhi: host: pci_generic: Add Quectel RM520N-GLAP to
 pci id table

+ Duke Xin

On Tue, Jul 29, 2025 at 01:37:51PM GMT, Michael Fritscher wrote:
> Quectel RM520N-GLAP is a variant of Quectel RM520N-GLAA with fused out USB.
> Add its PCI vendor and product id to the list to use the right dev info.
> 
> Signed-off-by: Michael Fritscher <michael@...tscher.net>
> ---
> This series add support for the Quectel RM520N-GLAP, which uses a
> Qualcomm PCI Vendor ID. Origin is linked at the end. After this it is
> found as
> 
> MHI PCI device found: quectel-rm5xx
> 
> and works.
> 

This looks similar to another issue that is being discussed here:
https://lore.kernel.org/mhi/ywase3lkm5iimrzyin5grb3hr36zedsvzs3p2z6z2q6532g3cq@25ibqnpmanvo/

These Quectel modems are reusing the QCOM Vendor IDs and ends up causing
trouble. We need to hear from Quectel on why this happens and how they want
these modems to be supported in mainline.

- Mani

> Link: https://forum.gl-inet.com/t/how-to-installing-vanilla-openwrt-on-gl-x3000/45404/15
> ---
>  drivers/bus/mhi/host/pci_generic.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c
> index 589cb6722316..3f3212dda5bb 100644
> --- a/drivers/bus/mhi/host/pci_generic.c
> +++ b/drivers/bus/mhi/host/pci_generic.c
> @@ -857,6 +857,9 @@ static const struct pci_device_id mhi_pci_id_table[] = {
>  		.driver_data = (kernel_ulong_t) &mhi_telit_fn980_hw_v1_info },
>  	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0306),
>  		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx55_info },
> +	/* RM520N-GL variant with Qualcomm vendor and subvendor ID */
> +	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0308, PCI_VENDOR_ID_QCOM, 0x5201),
> +		.driver_data = (kernel_ulong_t) &mhi_quectel_rm5xx_info },
>  	/* Telit FN990 */
>  	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0308, 0x1c5d, 0x2010),
>  		.driver_data = (kernel_ulong_t) &mhi_telit_fn990_info },
> 
> ---
> base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
> change-id: 20250729-add-rm520n-glap-support-8add91648721
> 
> Best regards,
> -- 
> Michael Fritscher <michael@...tscher.net>
> 

-- 
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