The CRTC pending flag will need to be accessed atomically in the vblank interrupt handler, memory barriers won't be enough to protect it. Use a spinlock instead. Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx> --- Changes since v3: - Reworded commit message --- drivers/gpu/drm/omapdrm/omap_crtc.c | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c index 7b67ecb02b74..827ac46a6d5e 100644 --- a/drivers/gpu/drm/omapdrm/omap_crtc.c +++ b/drivers/gpu/drm/omapdrm/omap_crtc.c @@ -69,6 +69,19 @@ enum omap_channel omap_crtc_channel(struct drm_crtc *crtc) return omap_crtc->channel; } +static bool omap_crtc_is_pending(struct drm_crtc *crtc) +{ + struct omap_crtc *omap_crtc = to_omap_crtc(crtc); + unsigned long flags; + bool pending; + + spin_lock_irqsave(&crtc->dev->event_lock, flags); + pending = omap_crtc->pending; + spin_unlock_irqrestore(&crtc->dev->event_lock, flags); + + return pending; +} + int omap_crtc_wait_pending(struct drm_crtc *crtc) { struct omap_crtc *omap_crtc = to_omap_crtc(crtc); @@ -78,7 +91,7 @@ int omap_crtc_wait_pending(struct drm_crtc *crtc) * a single frame refresh even on slower displays. */ return wait_event_timeout(omap_crtc->pending_wait, - !omap_crtc->pending, + !omap_crtc_is_pending(crtc), msecs_to_jiffies(250)); } @@ -296,6 +309,7 @@ static void omap_crtc_vblank_irq(struct omap_drm_irq *irq, uint32_t irqstatus) struct omap_crtc *omap_crtc = container_of(irq, struct omap_crtc, vblank_irq); struct drm_device *dev = omap_crtc->base.dev; + struct drm_crtc *crtc = &omap_crtc->base; if (dispc_mgr_go_busy(omap_crtc->channel)) return; @@ -304,10 +318,10 @@ static void omap_crtc_vblank_irq(struct omap_drm_irq *irq, uint32_t irqstatus) __omap_irq_unregister(dev, &omap_crtc->vblank_irq); - rmb(); + spin_lock(&crtc->dev->event_lock); WARN_ON(!omap_crtc->pending); omap_crtc->pending = false; - wmb(); + spin_unlock(&crtc->dev->event_lock); /* wake up userspace */ omap_crtc_complete_page_flip(&omap_crtc->base); @@ -339,10 +353,10 @@ static void omap_crtc_enable(struct drm_crtc *crtc) DBG("%s", omap_crtc->name); - rmb(); + spin_lock_irq(&crtc->dev->event_lock); WARN_ON(omap_crtc->pending); omap_crtc->pending = true; - wmb(); + spin_unlock_irq(&crtc->dev->event_lock); omap_irq_register(crtc->dev, &omap_crtc->vblank_irq); @@ -427,16 +441,13 @@ static void omap_crtc_atomic_flush(struct drm_crtc *crtc, DBG("%s: GO", omap_crtc->name); - rmb(); + spin_lock_irq(&crtc->dev->event_lock); WARN_ON(omap_crtc->pending); omap_crtc->pending = true; - wmb(); - if (crtc->state->event) { - spin_lock_irq(&crtc->dev->event_lock); + if (crtc->state->event) omap_crtc->event = crtc->state->event; - spin_unlock_irq(&crtc->dev->event_lock); - } + spin_unlock_irq(&crtc->dev->event_lock); dispc_mgr_go(omap_crtc->channel); omap_irq_register(crtc->dev, &omap_crtc->vblank_irq); -- Regards, Laurent Pinchart _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel