Bug 107136

Summary: Allow to load firmware during run-time (after initialization)
Product: DRI Reporter: Paul Menzel <pmenzel+bugs.freedesktop.org>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED WONTFIX QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: enhancement    
Priority: low CC: intel-gfx-bugs
Version: DRI git   
Hardware: Other   
OS: All   
Whiteboard: Triaged, ReadyForDev
i915 platform: i915 features: firmware/dmc

Description Paul Menzel 2018-07-06 10:29:07 UTC
Building the i915 driver into the Linux kernel, that means not as a module, *without* an initrd image, the message below is shown.

    [    0.427657] i915 0000:00:02.0: Direct firmware load for i915/skl_dmc_ver1_27.bin failed with error -2
    [    0.428121] i915 0000:00:02.0: Failed to load DMC firmware i915/skl_dmc_ver1_27.bin. Disabling runtime power management.
    [    0.428650] i915 0000:00:02.0: DMC firmware homepage: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915

The firmware is present on the filesystem, but it has not been mounted yet.

    $ ls -l /lib/firmware/i915/skl_dmc_ver1_27.bin
    -rw-rw-r-- 1 root root 8928 Jun  6 19:23 /lib/firmware/i915/skl_dmc_ver1_27.bin

The firmware can be added using `EXTRA_FIRMWARE`, but that makes it difficult if the Linux kernel should be shared between different systems using different hardware generations.

The best solution would be to not require firmware at all as in earlier hardware generations.

As a workaround it’d be great if the driver supported to load firmware after the initialization phase.
Comment 1 Jani Nikula 2018-10-24 08:31:17 UTC
Sorry, I don't think we want to take on supporting this configuration.

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