Re: [PROBLEM] bus: mhi: host: pci_generic: SDX24 Channels

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

+ Duke Xin (who is adding Quectel modem support these days)

On Sun, Jul 07, 2024 at 08:23:57PM +0300, Murithi Borona wrote:
> Hello,
> 
> Module: Quectel EM120R-GL
> 
> This module does not appear to work fully with the default SDX24 configuration.
> It appears to be another variant of the EM120R-GL (Also FCC-Locked by default).
> 
> Issues:
> - Debug ports are missing (AT)
> - It only works over MBIM/QMI with Qualcomm's RMNET driver.
> - In QMI mode it's really unstable and unpredictable with the QMI port
> freezing up.
> 
> Are there any missing channels in the SDX24 config or is this a hw/vendor issue.
> When using Quectel's drivers (and blacklisting mhi_pci_generic), all
> the ports are available.
> The configuration for other variants of the same module brings up the
> AT port ( with a recurring warning/error).
> 

Most likely this device is a derivative product that needs a different
configuration than EM120R-GL. Could you please share the sub-vendor/device ids?
You can just share the output of 'lspci -vmm' command.

Duke Xin: Are you aware of such derivative product?

- Mani

> >> [ 5074.472791] sequence number glitch prev=1 curr=0
> 
> 
> mhi_qcom_sdx24_info
> ==================
> 
> lspci: 0003:01:00.0 Unassigned class [ff00]: Qualcomm Technologies,
> Inc SDX24 [Snapdragon X24 4G] [17cb:0304]
> 
> ports: mhi_hwip0 (net), mhi_swip0 (net), wwan2mbim0 (mbim), wwan2qcdm0
> (ignored), wwan2qmi0 (qmi)
> 
> 
> mhi_quectel_em1xx_info
> ===================
> 
> lspci: 0003:01:00.0 Unassigned class [ff00]: Qualcomm Technologies,
> Inc SDX24 [Snapdragon X24 4G] [17cb:0304]
> 
> ports: wwan0 (net), wwan0at0 (at), wwan0mbim0 (mbim), wwan0qcdm0 (ignored)

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