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@xxxxxxxxxx>
> > ---
> > 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
