Re: [PATCH] drm/bridge: replace use of system_wq with system_percpu_wq

[Marco Crivellari]

Hi,

On Tue, Nov 4, 2025 at 12:13 PM Marco Crivellari
<marco.crivellari@xxxxxxxx> wrote:
> [...]
>  drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
>  drivers/gpu/drm/bridge/ti-tfp410.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Gentle ping.

Thanks!

--

Marco Crivellari

L3 Support Engineer


On Tue, Nov 4, 2025 at 12:13 PM Marco Crivellari
<marco.crivellari@xxxxxxxx> wrote:
>
> Currently if a user enqueue a work item using schedule_delayed_work() the
> used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
> WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
> schedule_work() that is using system_wq and queue_work(), that makes use
> again of WORK_CPU_UNBOUND.
>
> This lack of consistentcy cannot be addressed without refactoring the API.
>
> This patch continues the effort to refactor worqueue APIs, which has begun
> with the change introducing new workqueues and a new alloc_workqueue flag:
>
> commit 128ea9f6ccfb ("workqueue: Add system_percpu_wq and system_dfl_wq")
> commit 930c2ea566af ("workqueue: Add new WQ_PERCPU flag")
>
> system_wq should be the per-cpu workqueue, yet in this name nothing makes
> that clear, so replace system_wq with system_percpu_wq.
>
> The old wq (system_wq) will be kept for a few release cycles.
>
> Suggested-by: Tejun Heo <tj@xxxxxxxxxx>
> Signed-off-by: Marco Crivellari <marco.crivellari@xxxxxxxx>
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 2 +-
>  drivers/gpu/drm/bridge/ti-tfp410.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
> index a094803ba7aa..37bb8123cf9b 100644
> --- a/drivers/gpu/drm/bridge/ite-it6505.c
> +++ b/drivers/gpu/drm/bridge/ite-it6505.c
> @@ -2048,7 +2048,7 @@ static void it6505_start_hdcp(struct it6505 *it6505)
>
>         DRM_DEV_DEBUG_DRIVER(dev, "start");
>         it6505_reset_hdcp(it6505);
> -       queue_delayed_work(system_wq, &it6505->hdcp_work,
> +       queue_delayed_work(system_percpu_wq, &it6505->hdcp_work,
>                            msecs_to_jiffies(2400));
>  }
>
> diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c
> index b80ee089f880..85fa3f8a747e 100644
> --- a/drivers/gpu/drm/bridge/ti-tfp410.c
> +++ b/drivers/gpu/drm/bridge/ti-tfp410.c
> @@ -115,7 +115,7 @@ static void tfp410_hpd_callback(void *arg, enum drm_connector_status status)
>  {
>         struct tfp410 *dvi = arg;
>
> -       mod_delayed_work(system_wq, &dvi->hpd_work,
> +       mod_delayed_work(system_percpu_wq, &dvi->hpd_work,
>                          msecs_to_jiffies(HOTPLUG_DEBOUNCE_MS));
>  }
>
> --
> 2.51.1
>


--

Marco Crivellari

L3 Support Engineer