[ SRU Justification ]
[ Impact ]
No machine specific ISH fw to be loaded:
```
$ sudo dmesg | grep ish
kernel: intel_ish_ipc 0000:00:12.0: ISH loader: load firmware: intel/ish/ish_lnlm.bin
kernel: intel_ish_ipc 0000:00:12.0: ISH loader: cmd 2 failed 10
kernel: intel_ish_ipc 0000:00:12.0: ISH loader: cmd 2 failed 10
kernel: intel_ish_ipc 0000:00:12.0: ISH loader: wait response of cmd 0 timeout
```
Proposed fix https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=96ed5b3686d0836c33c7141f6deb2c3e555aa5a8 under upstream tag 20251011.
[ Test Plan ]
1. Install linux-firmware from -proposed pocket.
```
$ sudo apt install --no-install-recommends --yes linux-firmware
```
2. Make sure you update initramfs. The generic ish fw might have been included in initramfs, and that will become the first choice while searching for ish fw:
```
$ sudo update-initramfs -u -k all
```
3. Reboot and check dmesg:
```
$ sudo dmesg | grep ish
intel_ish_ipc 0000:00:12.0: ISH loader: load firmware: intel/ish/ish_lnlm_39ceeaf8.bin
intel_ish_ipc 0000:00:12.0: ISH loader: firmware loaded. size:854528
intel_ish_ipc 0000:00:12.0: ISH loader: FW base version: 5.8.0.7727
intel_ish_ipc 0000:00:12.0: ISH loader: FW project version: 58.7727.0.12958
ish-hid {33AECD58-B679-4E54-9BD9-A04D34F0C226}: [hid-ish]: enum_devices_done OK, num_hid_devices=3
hid-generic 001F:8087:0AC2.0002: hidraw1: SENSOR HUB HID v2.00 Device [hid-ishtp 8087:0AC2] on
hid-generic 001F:8087:0AC2.0003: hidraw2: SENSOR HUB HID v2.00 Device [hid-ishtp 8087:0AC2] on
hid-generic 001F:8087:0AC2.0004: hidraw3: SENSOR HUB HID v2.00 Device [hid-ishtp 8087:0AC2] on
hid-sensor-hub 001F:8087:0AC2.0002: hidraw1: SENSOR HUB HID v2.00 Device [hid-ishtp 8087:0AC2] on
hid-sensor-hub 001F:8087:0AC2.0003: hidraw2: SENSOR HUB HID v2.00 Device [hid-ishtp 8087:0AC2] on
hid-sensor-hub 001F:8087:0AC2.0004: hidraw3: SENSOR HUB HID v2.00 Device [hid-ishtp 8087:0AC2] on
```
[ Where problems could occur ]
No. This installs the right firmware for selected platforms and only the affects the platforms that need this firmware blob.
[ Other Info ]
Nominate for Noble, Plucky, Questing for support of DELL platforms of Intel Lunar Lake cpus. Resolute will have it after rebased onto tag 20251011.
========== original bug report ==========
Proposed fix https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/commit/?id=96ed5b3686d0836c33c7141f6deb2c3e555aa5a8 under upstream tag 20251011.
Somehow I feel there is a bug in update-initramfs.
So after install custom blobs:
$ ls -l|awk '/->/ {print $9 " " $10 " " $11}'
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm_
ish_lnlm.bin.zst
The custom blob is not loaded unless one symlink it as the default ish_lnlm.bin.zst:
[ 1.508997] intel_ish_ipc 0000:00:12.0: ISH loader: load firmware: intel/ish/
[ 1.534957] intel_ish_ipc 0000:00:12.0: ISH loader: firmware loaded. size:829952
[ 1.534959] intel_ish_ipc 0000:00:12.0: ISH loader: FW base version: 5.8.0.7724
[ 1.534961] intel_ish_ipc 0000:00:12.0: ISH loader: FW project version: 58.7724.2.12658
And from update-initramefs messages, custom blobs are not included into initramfs and therefore not detected:
$ update-initramefs -v -u -k $(uname -r)
...
dracut-install: Missing firmware intel/ish/ish_*.bin for kernel module intel_ish_ipc
dracut-install: mkdir '/var/tmp/
dracut-install: cp '/lib/firmware/
dracut-install: ln -s 'ish_lnlm_
...