Re: [PATCH] drm/i915: Avoid stalling on pending flips for legacy cursor updates

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Op 17-04-16 om 21:42 schreef Chris Wilson:
> The legacy cursor ioctl expects to be asynchronous with respect to other
> screen updates, in particular page flips. As X updates the cursor from a
> signal context, if the cursor blocks then it will stall both the input
> and output chains causing bad stuttering and horrible UX.
>
> Reported-and-tested-by: Rafael Ristovski <rafael.ristovski@xxxxxxxxx>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94980
> Fixes: 5008e874edd34 ("drm/i915: Make wait_for_flips interruptible.")
> Suggested-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
>  drivers/gpu/drm/i915/intel_display.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 4cca155376be..c5b9687091f4 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -13446,6 +13446,9 @@ static int intel_atomic_prepare_commit(struct drm_device *dev,
>  	}
>  
>  	for_each_crtc_in_state(state, crtc, crtc_state, i) {
> +		if (state->legacy_cursor_update)
> +			continue;
> +
>  		ret = intel_crtc_wait_for_pending_flips(crtc);
>  		if (ret)
>  			return ret;
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]