Re: [PATCH net-next v4 2/3] bus: mhi: host: pci_generic: enumerate IP_CTRL channel for Sierra EM919x/EM929x

[Manivannan Sadhasivam]

On Sun, Aug 16, 2026 at 06:17:04AM -0600, Peter Hunt wrote:
> IP_CTRL is a standard Qualcomm MHI control channel (channels 18/19) that
> carries the host serial control lines (DTR/RTS) to the modem; it is not
> Sierra-specific. It was not enumerated for any device in pci_generic, so
> the host had no way to drive those signals.
> 
> Enumerate it in the Sierra em919x channel config (shared by the EM919x
> and EM929x) using the control event ring. This is the device the change
> was tested against; other Qualcomm modem configs that expose IP_CTRL can
> enable it the same way, since the mhi_wwan_ctrl DTR support that consumes
> it, added by the following patch in this series, is device-agnostic and
> binds purely by channel name.
> 
> Reviewed-by: Loic Poulain <loic.poulain@xxxxxxxxxxxxxxxx>
> Signed-off-by: Peter Hunt <peter.hunt@xxxxxxxxxxxx>

Applied to mhi-next!

- Mani
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