Re: [RFC PATCH 01/18] drm/panthor: Ignore -EOPNOTSUPP for shader-present nvmem lookup

[Boris Brezillon]

On Thu, 28 May 2026 16:05:29 +0100
Karunika Choo <karunika.choo@xxxxxxx> wrote:

> When CONFIG_NVMEM is disabled, reading the optional "shader-present"
> nvmem cell can return -EOPNOTSUPP.
> 
> Treat this the same as the cell being absent so panthor can continue
> probing on platforms that do not provide shader-present fuses through
> nvmem.
> 
> Signed-off-by: Karunika Choo <karunika.choo@xxxxxxx>

Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>

> ---
>  drivers/gpu/drm/panthor/panthor_hw.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
> index 7e315708ca7c..4c96573b649a 100644
> --- a/drivers/gpu/drm/panthor/panthor_hw.c
> +++ b/drivers/gpu/drm/panthor/panthor_hw.c
> @@ -182,7 +182,7 @@ static int overload_shader_present(struct panthor_device *ptdev)
>  					      &contents);
>  	if (!ret)
>  		ptdev->gpu_info.shader_present = contents;
> -	else if (ret == -ENOENT)
> +	else if (ret == -ENOENT || ret == -EOPNOTSUPP)
>  		return 0;
>  	else
>  		return dev_err_probe(ptdev->base.dev, ret,