Re: [PATCH] iommu/vsi: keep the runtime PM callbacks without PM_SLEEP

[Benjamin Gaignard]

Le 25/10/2026 à 14:27, Daniel Golle a écrit :
> The runtime PM operations are handed to the driver core through
> pm_sleep_ptr(), which is NULL unless CONFIG_PM_SLEEP is set.
>
> Without system sleep support the IOMMU has no runtime PM callbacks at
> all: its clocks are never enabled by the driver, the page table is not
> restored when the power domain comes back, and iommu->enable stays set
> while genpd powers the domain off.
> The TLB flush issued from vsi_iommu_map() then writes to the unpowered
> IOMMU, and the first buffer allocation of the RK3588 AV1 decoder ends
> in an asynchronous SError.
>
> Use pm_ptr(), which keeps the operations whenever CONFIG_PM is set.
>
> Fixes: 917ace84b770 ("iommu: Add verisilicon IOMMU driver")

Thanks for the patch.

Reviewed-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>

> Signed-off-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
> ---
>   drivers/iommu/vsi-iommu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/vsi-iommu.c b/drivers/iommu/vsi-iommu.c
> index 5dac20b143a55..1b447c0693936 100644
> --- a/drivers/iommu/vsi-iommu.c
> +++ b/drivers/iommu/vsi-iommu.c
> @@ -780,7 +780,7 @@ static struct platform_driver rockchip_vsi_iommu_driver = {
>   	.driver = {
>   		   .name = "vsi_iommu",
>   		   .of_match_table = vsi_iommu_dt_ids,
> -		   .pm = pm_sleep_ptr(&vsi_iommu_pm_ops),
> +		   .pm = pm_ptr(&vsi_iommu_pm_ops),
>   		   .suppress_bind_attrs = true,
>   	},
>   };
>
> base-commit: bd1ecbb61afefc6a8b876ccbc31e9228b44e9eab