Re: [RFC PATCH v2 9/9] drm: mali-dp: Add writeback out-fence support

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On Wed, Oct 26, 2016 at 07:43:57PM -0200, Gustavo Padovan wrote:
2016-10-26 Brian Starkey <brian.starkey@xxxxxxx>:

If userspace has asked for an out-fence for the writeback, we add a
fence to malidp_mw_job, to be signaled when the writeback job has
completed.

Signed-off-by: Brian Starkey <brian.starkey@xxxxxxx>
---
 drivers/gpu/drm/arm/malidp_hw.c |    5 ++++-
 drivers/gpu/drm/arm/malidp_mw.c |   18 +++++++++++++++++-
 drivers/gpu/drm/arm/malidp_mw.h |    3 +++
 3 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/arm/malidp_hw.c b/drivers/gpu/drm/arm/malidp_hw.c
index 1689547..3032226 100644
--- a/drivers/gpu/drm/arm/malidp_hw.c
+++ b/drivers/gpu/drm/arm/malidp_hw.c
@@ -707,8 +707,11 @@ static irqreturn_t malidp_se_irq(int irq, void *arg)
 		unsigned long irqflags;
 		/*
 		 * We can't unreference the framebuffer here, so we queue it
-		 * up on our threaded handler.
+		 * up on our threaded handler. However, signal the fence
+		 * as soon as possible
 		 */
+		malidp_mw_job_signal(drm, malidp->current_mw, 0);

Drivers should not deal with fences directly. We need some sort of
drm_writeback_finished() that will do the signalling for you.


With a signature like this?
	drm_writeback_finished(struct drm_connector_state *state);

I'll have to think about how to achieve that. The state isn't
refcounted and the driver isn't in charge of it's lifetime. I'm not
sure how/where to ensure the state doesn't get destroyed before its
been signaled.

-Brian

Gustavo

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