drm: adp: Enable vblank interrupts in crtc's .atomic_enable

Calling drm_crtc_vblank_on() drm_crtc_helper_funcs' atomic_enable is
expected to enable vblank interrupts. It may have been avoided here to
due to drm_crtc_vblank_get()'s error behavior after
drm_crtc_vblank_reset(). With that fixed in the preceding change the
driver can call drm_crtc_vblank_on() from adp_crtc_atomic_enable().

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: Janne Grunau <j@jannau.net>
Link: https://lore.kernel.org/r/20250428-drm_adp_fixes-v2-3-912e081e55d8@jannau.net
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>

Author: jannau

drivers/gpu/drm/adp/adp_drv.c

@@ -288,6 +288,7 @@ static void adp_crtc_atomic_enable(struct drm_crtc *crtc,
 	writel(BIT(0), adp->be + ADBE_BLEND_EN3);
 	writel(BIT(0), adp->be + ADBE_BLEND_BYPASS);
 	writel(BIT(0), adp->be + ADBE_BLEND_EN4);
+	drm_crtc_vblank_on(crtc);
 }
 
 static void adp_crtc_atomic_disable(struct drm_crtc *crtc,
@@ -519,8 +520,7 @@ static int adp_drm_bind(struct device *dev)
 	struct adp_drv_private *adp = to_adp(drm);
 	int err;
 
-	adp_disable_vblank(adp);
-	writel(ADP_CTRL_FIFO_ON | ADP_CTRL_VBLANK_ON, adp->fe + ADP_CTRL);
+	writel(ADP_CTRL_FIFO_ON, adp->fe + ADP_CTRL);
 
 	adp->next_bridge = drmm_of_get_bridge(&adp->drm, dev->of_node, 0, 0);
 	if (IS_ERR(adp->next_bridge)) {