From a8015f7dfc682100434e3ee051bf9472a8e6cad4 Mon Sep 17 00:00:00 2001

From: Jeremy Linton <jeremy.linton@arm.com>

Date: Fri, 6 Oct 2023 10:33:22 -0500

Subject: [PATCH] feat(kernel-modules): add Qualcomm IPC router to enable USB

The x13s, and possibly other Qualcomm based devices need the QC

IPC router driver in order to enable USB. Without it, its not

possible to boot from USB-C attached disks.

IPC in this case is Inter _Processor_ Communication and forms

the message bus used to communicate between differing processing

elements in a given system/SoC running and managing various

hardware devices. This means that while it appears this driver

should be in the dracut network modules that is incorrect

because its not for enabling host networking in the initrd,

but rather for communicating with other hardware blocks.

Those other blocks aren't limited to modems, but any SMD (shared

memory device), which on QC based machines includes the audio DSPs,

RPM (resource power manager) and of course the application

processor cores linux is running on.

References:

https://osmocom.org/projects/quectel-modems/wiki/Qualcomm_Linux_SMD

https://android.googlesource.com/kernel/msm/+/android-7.1.0_r0.2/Documentation/arm/msm/msm_ipc_router.txt

https://github.com/dracutdevs/dracut/pull/2531

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>

---

 modules.d/90kernel-modules/module-setup.sh | 3 ++-

 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules.d/90kernel-modules/module-setup.sh b/modules.d/90kernel-modules/module-setup.sh

index e217512594..75afecc86f 100755

--- a/modules.d/90kernel-modules/module-setup.sh

+++ b/modules.d/90kernel-modules/module-setup.sh

@@ -95,7 +95,8 @@ installkernel() {

                 "=drivers/usb/misc" \

                 "=drivers/usb/musb" \

                 "=drivers/usb/phy" \

-                "=drivers/scsi/hisi_sas"

+                "=drivers/scsi/hisi_sas" \

+                "=net/qrtr"

         fi

         awk -F: '/^\// {print $1}' "$srcmods/modules.dep" 2> /dev/null | instmods