On Wed, May 18, 2022 at 03:02:51PM -0700, Brian Norris wrote:
> From: Dmitry Torokhov <dtor@xxxxxxxxxxxx>
>
> initcall_debug shows that OHCI controllers take ~60ms to probe on
> Rockchip RK3399 systems:
>
> probe of fe3a0000.usb returned 1 after 58941 usecs
>
> A few of these can add up to waste non-trivial amounts of time at boot.
>
> These host controllers don't provide resources to other drivers, so
> this shouldn't contribute to exposing race conditions.
>
> Chrome OS kernels have carried this patch on some systems for a while
> without issues. Similar patches have been merged for a variety of (e)MMC
> host controllers for similar reasons.
>
> Signed-off-by: Dmitry Torokhov <dtor@xxxxxxxxxxxx>
> [Brian: rewrote commit message, refreshed, but retained dtor's original
> authorship ]
> Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx>
> ---
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> drivers/usb/host/ehci-platform.c | 1 +
> drivers/usb/host/ohci-platform.c | 1 +
> 2 files changed, 2 insertions(+)
>
> diff --git a/drivers/usb/host/ehci-platform.c b/drivers/usb/host/ehci-platform.c
> index 1115431a255d..f343967443e2 100644
> --- a/drivers/usb/host/ehci-platform.c
> +++ b/drivers/usb/host/ehci-platform.c
> @@ -518,6 +518,7 @@ static struct platform_driver ehci_platform_driver = {
> .pm = pm_ptr(&ehci_platform_pm_ops),
> .of_match_table = vt8500_ehci_ids,
> .acpi_match_table = ACPI_PTR(ehci_acpi_match),
> + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> }
> };
>
> diff --git a/drivers/usb/host/ohci-platform.c b/drivers/usb/host/ohci-platform.c
> index 4a8456f12a73..47dfbfe9e519 100644
> --- a/drivers/usb/host/ohci-platform.c
> +++ b/drivers/usb/host/ohci-platform.c
> @@ -334,6 +334,7 @@ static struct platform_driver ohci_platform_driver = {
> .name = "ohci-platform",
> .pm = &ohci_platform_pm_ops,
> .of_match_table = ohci_platform_ids,
> + .probe_type = PROBE_PREFER_ASYNCHRONOUS,
> }
> };
>
> --
> 2.36.1.124.g0e6072fb45-goog
>
