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Tue, 25 Jun 2019 13:03:27 -0700 (PDT) Date: Tue, 25 Jun 2019 22:03:25 +0200 From: Daniel Vetter To: Robert Beckett Subject: Re: [PATCH v3 2/4] drm/imx: notify drm core before sending event during crtc disable Message-ID: <20190625200324.GE12905@phenom.ffwll.local> Mail-Followup-To: Robert Beckett , dri-devel@lists.freedesktop.org, Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Philipp Zabel , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <066eb916ec920e0515367548e4af2ee28f9d0a43.1561483965.git.bob.beckett@collabora.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <066eb916ec920e0515367548e4af2ee28f9d0a43.1561483965.git.bob.beckett@collabora.com> X-Operating-System: Linux phenom 4.19.0-5-amd64 User-Agent: Mutt/1.10.1 (2018-07-13) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190625_130329_559843_9EC287F6 X-CRM114-Status: GOOD ( 18.60 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fabio Estevam , Philipp Zabel , Maxime Ripard , Shawn Guo , Sascha Hauer , Maarten Lankhorst , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, David Airlie , NXP Linux Team , Daniel Vetter , Sean Paul , Pengutronix Kernel Team , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Jun 25, 2019 at 06:59:13PM +0100, Robert Beckett wrote: > Notify drm core before sending pending events during crtc disable. > This fixes the first event after disable having an old stale timestamp > by having drm_crtc_vblank_off update the timestamp to now. > > This was seen while debugging weston log message: > Warning: computed repaint delay is insane: -8212 msec > > This occured due to: > 1. driver starts up > 2. fbcon comes along and restores fbdev, enabling vblank > 3. vblank_disable_fn fires via timer disabling vblank, keeping vblank > seq number and time set at current value > (some time later) > 4. weston starts and does a modeset > 5. atomic commit disables crtc while it does the modeset > 6. ipu_crtc_atomic_disable sends vblank with old seq number and time > > Fixes: a474478642d5 ("drm/imx: fix crtc vblank state regression") > > Signed-off-by: Robert Beckett Now that I understand what's going on here: Reviewed-by: Daniel Vetter > --- > drivers/gpu/drm/imx/ipuv3-crtc.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c > index 9cc1d678674f..e04d6efff1b5 100644 > --- a/drivers/gpu/drm/imx/ipuv3-crtc.c > +++ b/drivers/gpu/drm/imx/ipuv3-crtc.c > @@ -91,14 +91,14 @@ static void ipu_crtc_atomic_disable(struct drm_crtc *crtc, > ipu_dc_disable(ipu); > ipu_prg_disable(ipu); > > + drm_crtc_vblank_off(crtc); > + > spin_lock_irq(&crtc->dev->event_lock); > if (crtc->state->event) { > drm_crtc_send_vblank_event(crtc, crtc->state->event); > crtc->state->event = NULL; > } > spin_unlock_irq(&crtc->dev->event_lock); > - > - drm_crtc_vblank_off(crtc); > } > > static void imx_drm_crtc_reset(struct drm_crtc *crtc) > -- > 2.18.0 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel