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The flashing process for dGPUs uses sysfs files in a non-obvious way, so document it for users. Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
33 lines
1.2 KiB
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33 lines
1.2 KiB
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dGPU firmware flashing
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=======================
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IFWI
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----
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Flashing the dGPU integrated firmware image (IFWI) is supported by GPUs that
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use the PSP to orchestrate the update (Navi3x or newer GPUs).
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For supported GPUs, `amdgpu` will export a series of sysfs files that can be
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used for the flash process.
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The IFWI flash process is:
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1. Ensure the IFWI image is intended for the dGPU on the system.
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2. "Write" the IFWI image to the sysfs file `psp_vbflash`. This will stage the IFWI in memory.
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3. "Read" from the `psp_vbflash` sysfs file to initiate the flash process.
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4. Poll the `psp_vbflash_status` sysfs file to determine when the flash process completes.
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USB-C PD F/W
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------------
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On GPUs that support flashing an updated USB-C PD firmware image, the process
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is done using the `usbc_pd_fw` sysfs file.
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* Reading the file will provide the current firmware version.
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* Writing the name of a firmware payload stored in `/lib/firmware/amdgpu` to the sysfs file will initiate the flash process.
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The firmware payload stored in `/lib/firmware/amdgpu` can be named any name
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as long as it doesn't conflict with other existing binaries that are used by
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`amdgpu`.
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sysfs files
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-----------
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.. kernel-doc:: drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
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