lkml.org 
[lkml]   [2019]   [Jun]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4 2/2] Revert "drm/vblank: Do not update vblank count if interrupts are already disabled."
On Fri, Jun 28, 2019 at 01:05:32PM +0100, Robert Beckett wrote:
> If interrupts are already disabled, then the timestamp for the vblank
> does not get updated, causing a stale timestamp to be reported to
> userland while disabling crtcs.
>
> This reverts commit 68036b08b91bc491ccc308f902616a570a49227c.

Please cc the people involved in that. And I'd drop the lkml cc.

>
> Signed-off-by: Robert Beckett <bob.beckett@collabora.com>
> ---
> drivers/gpu/drm/drm_vblank.c | 18 ++++++++----------
> 1 file changed, 8 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
> index 7dabb2bdb733..aeb9734d7799 100644
> --- a/drivers/gpu/drm/drm_vblank.c
> +++ b/drivers/gpu/drm/drm_vblank.c
> @@ -371,25 +371,23 @@ void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe)
> spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
>
> /*
> - * Update vblank count and disable vblank interrupts only if the
> - * interrupts were enabled. This avoids calling the ->disable_vblank()
> - * operation in atomic context with the hardware potentially runtime
> - * suspended.
> + * Only disable vblank interrupts if they're enabled. This avoids
> + * calling the ->disable_vblank() operation in atomic context with the
> + * hardware potentially runtime suspended.
> */
> - if (!vblank->enabled)
> - goto out;
> + if (vblank->enabled) {
> + __disable_vblank(dev, pipe);
> + vblank->enabled = false;
> + }
>
> /*
> - * Update the count and timestamp to maintain the
> + * Always update the count and timestamp to maintain the
> * appearance that the counter has been ticking all along until
> * this time. This makes the count account for the entire time
> * between drm_crtc_vblank_on() and drm_crtc_vblank_off().
> */
> drm_update_vblank_count(dev, pipe, false);
> - __disable_vblank(dev, pipe);
> - vblank->enabled = false;
>
> -out:
> spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
> }
>
> --
> 2.18.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Ville Syrjälä
Intel

\
 
 \ /
  Last update: 2019-06-28 14:13    [W:0.057 / U:0.096 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site