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