[PATCH 1/2] Fix the imx8mm gpu hang due to adb400 reset wrongly

[Krzysztof Kozlowski]

On 19/01/2026 09:53, Jacky Bai wrote:
> Due to the HW limitation on i.MX8MM, the gpumix, gpu2d and
> gpu3d share the same reset domain, that means when gpu2d/3d
> go through the power off/on cycle, the gpu2d/3d reset will
> also reset the gpumix domain, The GPUMIX ADB400 port also be
> reset. But the ADB400 must be put into power down before reset
> it.
> 
> currently, gpumix, gpu2d/3d power domain use the pm runtime_pm
> to handle these power domain dependency, but in some corner case,
> the gpumix power off will be skipped, then the ADB400 port will
> be in active while gpu2d/3d doing the reset. The GPUMIX the ADB400
> port will be reset wrongly, so lead to unpredictable bus behavior.
> 
> To simplify these domain on/off order & dependency, refine the
> code to directly handle GPUMIX domain on/off along with the
> gpu2d/3d power on/off flow.
> 
> Signed-off-by: Jacky Bai <ping.bai at nxp.com>
> ---

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Best regards,
Krzysztof