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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 Signed-off-by: Peter Hunt --- v4: Reword present-tense forward reference to the consumer in patch 3 --- drivers/bus/mhi/host/pci_generic.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/bus/mhi/host/pci_generic.c b/drivers/bus/mhi/host/pci_generic.c index 0d0d9c7ffa4b..ba47dd153837 100644 --- a/drivers/bus/mhi/host/pci_generic.c +++ b/drivers/bus/mhi/host/pci_generic.c @@ -728,6 +728,8 @@ static const struct mhi_channel_config mhi_sierra_em919x_channels[] = { MHI_CHANNEL_CONFIG_DL(13, "MBIM", 128, 0), MHI_CHANNEL_CONFIG_UL(14, "QMI", 32, 0), MHI_CHANNEL_CONFIG_DL(15, "QMI", 32, 0), + MHI_CHANNEL_CONFIG_UL(18, "IP_CTRL", 32, 0), + MHI_CHANNEL_CONFIG_DL(19, "IP_CTRL", 32, 0), MHI_CHANNEL_CONFIG_UL(32, "DUN", 32, 0), MHI_CHANNEL_CONFIG_DL(33, "DUN", 32, 0), MHI_CHANNEL_CONFIG_HW_UL(100, "IP_HW0", 512, 1), -- 2.43.0