linux-kernel - Re: [PATCH] mhi: pci_generic: add support for sc8280xp-crd SDX55 variant

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Message-ID: <Y2Jp/wNPmTrC6sEy@hovoldconsulting.com>
Date:   Wed, 2 Nov 2022 14:00:47 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Manivannan Sadhasivam <mani@...nel.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Hemant Kumar <quic_hemantk@...cinc.com>, mhi@...ts.linux.dev,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mhi: pci_generic: add support for sc8280xp-crd SDX55
 variant

On Tue, Nov 01, 2022 at 05:12:58PM +0530, Manivannan Sadhasivam wrote:
> On Mon, Oct 31, 2022 at 09:34:29AM +0100, Johan Hovold wrote:
> > The SC8280XP Compute Reference Design (CRD) has an on-PCB SDX55 modem
> > which uses MBIM.
> > 
> > The exact channel configuration is not known but the Foxconn SDX55
> > configuration allows the modem to be used so reuse that one for now.
> > 
> > Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> > ---
> >  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 caa4ce28cf9e..f9f4345d472d 100644
> > --- a/drivers/bus/mhi/host/pci_generic.c
> > +++ b/drivers/bus/mhi/host/pci_generic.c
> > @@ -542,6 +542,9 @@ static const struct mhi_pci_dev_info mhi_telit_fn990_info = {
> >  static const struct pci_device_id mhi_pci_id_table[] = {
> >  	{ PCI_DEVICE(PCI_VENDOR_ID_QCOM, 0x0304),
> >  		.driver_data = (kernel_ulong_t) &mhi_qcom_sdx24_info },
> > +	/* SC8280XP-CRD (sdx55) */
> 
> Platform device name is not needed.

Ok, only added it because the other entries had a description.
 
> > +	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, PCI_VENDOR_ID_QCOM, 0x010c),
> 
> Sub ID looks wierd. Did you test with mhi_qcom_sdx55_info? If it didn't
> work, what was the issue?

I obviously added the new entry because the default match did not work.

I haven't had time to look at this since before the summer, but based on
my notes and a quick test now it seems that the QMI channel is not
supported and ModemManager takes forever to enumerate with a bunch of
failed transactions every second:

  ModemManager[469]: [/dev/wwan0qmi0] Checking version info (45 retries)...
  ...
  ModemManager[469]: transaction 0x2 aborted, but message is not abortable
  ...
  ModemManager[469]: transaction 0x2e aborted, but message is not abortable
  ...
  ModemManager[469]: <warn>  [plugin/generic] could not grab port wwan0qmi0: Cannot add port 'wwan/wwan0qmi0', unhandled port type

According to my notes I could connect to the provider after the (~45 s)
timeout, but no data was coming through with the default config which I
attributed to the differences in the data channel configuration (i.e.
"IP_HW0" and "IP_HW0_MBIM" are handled by different drivers).
 
> > +		.driver_data = (kernel_ulong_t) &mhi_foxconn_sdx55_info },
> >  	/* EM919x (sdx55), use the same vid:pid as qcom-sdx55m */
> >  	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_QCOM, 0x0306, 0x18d7, 0x0200),
> >  		.driver_data = (kernel_ulong_t) &mhi_sierra_em919x_info },
> > -- 
> > 2.37.3

Johan