From mboxrd@z Thu Jan 1 00:00:00 1970 From: Helen Koike Subject: [PATCH v2 3/5] drm/msm: fix fb references in async update Date: Mon, 11 Mar 2019 23:22:01 -0300 Message-ID: <20190312022204.2775-4-helen.koike@collabora.com> References: <20190312022204.2775-1-helen.koike@collabora.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190312022204.2775-1-helen.koike@collabora.com> Sender: linux-kernel-owner@vger.kernel.org To: dri-devel@lists.freedesktop.org, nicholas.kazlauskas@amd.com Cc: andrey.grodzovsky@amd.com, daniel.vetter@ffwll.ch, linux-kernel@vger.kernel.org, Tomasz Figa , boris.brezillon@collabora.com, David Airlie , Sean Paul , kernel@collabora.com, harry.wentland@amd.com, =?UTF-8?q?St=C3=A9phane=20Marchesin?= , Helen Koike , stable@vger.kernel.org, linux-arm-msm@vger.kernel.org, =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Russell King , Mamta Shukla , robdclark@gmail.com, Maarten Lankhorst , freedreno@lists.freedesktop.org, Sean Paul , Daniel Vetter List-Id: linux-arm-msm@vger.kernel.org Async update callbacks are expected to set the old_fb in the new_state so prepare/cleanup framebuffers are balanced. Cc: # v4.14+ Fixes: 224a4c970987 ("drm/msm: update cursors asynchronously through atomic") Suggested-by: Boris Brezillon Signed-off-by: Helen Koike --- Hello, As mentioned in the cover letter, But I couldn't test on MSM because I don't have the hardware and I would appreciate if anyone could test it. In other platforms (VC4, AMD, Rockchip), there is a hidden drm_framebuffer_get(new_fb)/drm_framebuffer_put(old_fb) in async_update that is wrong, but I couldn't identify those here, not sure if it is hidden somewhere else, but if tests fail this is probably the cause. Thanks! Helen Changes in v2: - update CC stable and Fixes tag drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c index be13140967b4..b854f471e9e5 100644 --- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c +++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_plane.c @@ -502,6 +502,8 @@ static int mdp5_plane_atomic_async_check(struct drm_plane *plane, static void mdp5_plane_atomic_async_update(struct drm_plane *plane, struct drm_plane_state *new_state) { + struct drm_framebuffer *old_fb = plane->state->fb; + plane->state->src_x = new_state->src_x; plane->state->src_y = new_state->src_y; plane->state->crtc_x = new_state->crtc_x; @@ -524,6 +526,8 @@ static void mdp5_plane_atomic_async_update(struct drm_plane *plane, *to_mdp5_plane_state(plane->state) = *to_mdp5_plane_state(new_state); + + new_state->fb = old_fb; } static const struct drm_plane_helper_funcs mdp5_plane_helper_funcs = { -- 2.20.1