linux-kernel - [PATCH AUTOSEL 5.4 05/27] drm/vc4: crtc: Move the BO handling out of common page-flip callback

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Date:   Mon, 27 Jun 2022 22:23:51 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Maxime Ripard <maxime@...no.tech>, Melissa Wen <mwen@...lia.com>,
        Sasha Levin <sashal@...nel.org>, emma@...olt.net,
        mripard@...nel.org, airlied@...ux.ie, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 05/27] drm/vc4: crtc: Move the BO handling out of common page-flip callback

From: Maxime Ripard <maxime@...no.tech>

[ Upstream commit 4d12c36fb73b5c49fe2f95d06515fd9846010fd2 ]

We'll soon introduce another completion callback source that won't need
to use the BO reference counting, so let's move it around to create a
function we will be able to share between both callbacks.

Reviewed-by: Melissa Wen <mwen@...lia.com>
Signed-off-by: Maxime Ripard <maxime@...no.tech>
Link: https://lore.kernel.org/r/20220610115149.964394-11-maxime@cerno.tech
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/vc4/vc4_crtc.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
index c2ff62917c09..a977172ba26f 100644
--- a/drivers/gpu/drm/vc4/vc4_crtc.c
+++ b/drivers/gpu/drm/vc4/vc4_crtc.c
@@ -862,21 +862,8 @@ vc4_async_page_flip_complete(struct vc4_async_flip_state *flip_state)
 	drm_crtc_vblank_put(crtc);
 	drm_framebuffer_put(flip_state->fb);
 
-	/* Decrement the BO usecnt in order to keep the inc/dec calls balanced
-	 * when the planes are updated through the async update path.
-	 * FIXME: we should move to generic async-page-flip when it's
-	 * available, so that we can get rid of this hand-made cleanup_fb()
-	 * logic.
-	 */
-	if (flip_state->old_fb) {
-		struct drm_gem_cma_object *cma_bo;
-		struct vc4_bo *bo;
-
-		cma_bo = drm_fb_cma_get_gem_obj(flip_state->old_fb, 0);
-		bo = to_vc4_bo(&cma_bo->base);
-		vc4_bo_dec_usecnt(bo);
+	if (flip_state->old_fb)
 		drm_framebuffer_put(flip_state->old_fb);
-	}
 
 	kfree(flip_state);
 
@@ -887,8 +874,27 @@ static void vc4_async_page_flip_seqno_complete(struct vc4_seqno_cb *cb)
 {
 	struct vc4_async_flip_state *flip_state =
 		container_of(cb, struct vc4_async_flip_state, cb.seqno);
+	struct vc4_bo *bo = NULL;
+
+	if (flip_state->old_fb) {
+		struct drm_gem_cma_object *cma_bo =
+			drm_fb_cma_get_gem_obj(flip_state->old_fb, 0);
+		bo = to_vc4_bo(&cma_bo->base);
+	}
 
 	vc4_async_page_flip_complete(flip_state);
+
+	/*
+	 * Decrement the BO usecnt in order to keep the inc/dec
+	 * calls balanced when the planes are updated through
+	 * the async update path.
+	 *
+	 * FIXME: we should move to generic async-page-flip when
+	 * it's available, so that we can get rid of this
+	 * hand-made cleanup_fb() logic.
+	 */
+	if (bo)
+		vc4_bo_dec_usecnt(bo);
 }
 
 /* Implements async (non-vblank-synced) page flips.
-- 
2.35.1