Having the pending variable available as atomic bit helps with the later addition of manually updated display support. Signed-off-by: Sebastian Reichel <sre@xxxxxxxxxx> --- drivers/gpu/drm/omapdrm/omap_crtc.c | 31 +++++++++++++++++-------------- 1 file changed, 17 insertions(+), 14 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/omap_crtc.c b/drivers/gpu/drm/omapdrm/omap_crtc.c index 2ed0754ed19e..5ef27664bcfa 100644 --- a/drivers/gpu/drm/omapdrm/omap_crtc.c +++ b/drivers/gpu/drm/omapdrm/omap_crtc.c @@ -28,6 +28,11 @@ #define to_omap_crtc(x) container_of(x, struct omap_crtc, base) +enum omap_crtc_state { + crtc_enabled = 0, + crtc_pending = 1 +}; + struct omap_crtc { struct drm_crtc base; @@ -49,7 +54,7 @@ struct omap_crtc { bool ignore_digit_sync_lost; - bool pending; + unsigned long state; wait_queue_head_t pending_wait; }; @@ -81,7 +86,7 @@ int omap_crtc_wait_pending(struct drm_crtc *crtc) struct omap_crtc *omap_crtc = to_omap_crtc(crtc); return wait_event_timeout(omap_crtc->pending_wait, - !omap_crtc->pending, + !test_bit(crtc_pending, &omap_crtc->state), msecs_to_jiffies(50)); } @@ -311,10 +316,8 @@ static void omap_crtc_vblank_irq(struct omap_drm_irq *irq, uint32_t irqstatus) __omap_irq_unregister(dev, &omap_crtc->vblank_irq); - rmb(); - WARN_ON(!omap_crtc->pending); - omap_crtc->pending = false; - wmb(); + if (!test_and_clear_bit(crtc_pending, &omap_crtc->state)) + dev_warn(dev->dev, "pending bit was not set in vblank irq"); /* wake up userspace */ omap_crtc_complete_page_flip(&omap_crtc->base); @@ -351,13 +354,12 @@ static bool omap_crtc_mode_fixup(struct drm_crtc *crtc, static void omap_crtc_enable(struct drm_crtc *crtc) { struct omap_crtc *omap_crtc = to_omap_crtc(crtc); + struct drm_device *dev = crtc->dev; DBG("%s", omap_crtc->name); - rmb(); - WARN_ON(omap_crtc->pending); - omap_crtc->pending = true; - wmb(); + if (test_and_set_bit(crtc_pending, &omap_crtc->state)) + dev_warn(dev->dev, "crtc enable while pending bit set!"); omap_irq_register(crtc->dev, &omap_crtc->vblank_irq); @@ -397,6 +399,7 @@ static void omap_crtc_atomic_flush(struct drm_crtc *crtc, struct drm_crtc_state *old_crtc_state) { struct omap_crtc *omap_crtc = to_omap_crtc(crtc); + struct drm_device *dev = crtc->dev; WARN_ON(omap_crtc->vblank_irq.registered); @@ -404,10 +407,8 @@ static void omap_crtc_atomic_flush(struct drm_crtc *crtc, DBG("%s: GO", omap_crtc->name); - rmb(); - WARN_ON(omap_crtc->pending); - omap_crtc->pending = true; - wmb(); + if (test_and_set_bit(crtc_pending, &omap_crtc->state)) + dev_warn(dev->dev, "atomic flush while pending bit set!"); dispc_mgr_go(omap_crtc->channel); omap_irq_register(crtc->dev, &omap_crtc->vblank_irq); @@ -509,6 +510,8 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev, init_waitqueue_head(&omap_crtc->pending_wait); + omap_crtc->state = 0; + omap_crtc->channel = channel; omap_crtc->name = channel_names[channel]; -- 2.7.0 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html