linux-kernel - Re: [PATCH v2] drm/radeon: Remove deprecated create_singlethread

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Date:	Mon, 18 Jul 2016 15:21:21 +0200
From:	Christian König <christian.koenig@....com>
To:	Bhaktipriya Shridhar <bhaktipriya96@...il.com>,
	Alex Deucher <alexander.deucher@....com>,
	David Airlie <airlied@...ux.ie>
CC:	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	"Tejun Heo" <tj@...nel.org>
Subject: Re: [PATCH v2] drm/radeon: Remove deprecated
 create_singlethread_workqueue

Am 16.07.2016 um 13:30 schrieb Bhaktipriya Shridhar:
> alloc_workqueue replaces deprecated create_singlethread_workqueue().
>
> Each hardware CRTC has a single flip work queue.
> When a radeon_flip_work_func item is queued, it needs to be executed
> ASAP because even a slight delay may cause the flip to be delayed by
> one refresh cycle.
>
> Hence, a dedicated workqueue with WQ_HIGHPRI set, has been used here
> since a delay can cause the outcome to miss the refresh cycle.
>
> Since there are only a fixed number of work items, explicit concurrency
> limit is unnecessary here.
>
> Signed-off-by: Bhaktipriya Shridhar <bhaktipriya96@...il.com>

Reviewed-by: Christian König <christian.koenig@....com>

> ---
>   Changes in v2:
> 	-Used a dedicated work queue with WQ_HIGHPRI
>
>   drivers/gpu/drm/radeon/radeon_display.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
> index 6a41b49..64b246e 100644
> --- a/drivers/gpu/drm/radeon/radeon_display.c
> +++ b/drivers/gpu/drm/radeon/radeon_display.c
> @@ -711,7 +711,7 @@ static void radeon_crtc_init(struct drm_device *dev, int index)
>
>   	drm_mode_crtc_set_gamma_size(&radeon_crtc->base, 256);
>   	radeon_crtc->crtc_id = index;
> -	radeon_crtc->flip_queue = create_singlethread_workqueue("radeon-crtc");
> +	radeon_crtc->flip_queue = alloc_workqueue("radeon-crtc", WQ_HIGHPRI, 0);
>   	rdev->mode_info.crtcs[index] = radeon_crtc;
>
>   	if (rdev->family >= CHIP_BONAIRE) {
> --
> 2.1.4
>