drm/omapdrm: Track IRQ state in local device state

Replace usage of struct drm_device.irq_enabled with the driver's
own state field struct omap_drm_device.irq_enabled. The field in
the DRM device structure is considered legacy and should not be
used by KMS drivers.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210625082222.3845-16-tzimmermann@suse.de

drivers/gpu/drm/omapdrm/omap_drv.h

@@ -48,6 +48,8 @@ struct omap_drm_private {
 	struct dss_device *dss;
 	struct dispc_device *dispc;
 
+	bool irq_enabled;
+
 	unsigned int num_pipes;
 	struct omap_drm_pipeline pipes[8];
 	struct omap_drm_pipeline *channels[8];

drivers/gpu/drm/omapdrm/omap_irq.c

@@ -291,7 +291,7 @@ int omap_drm_irq_install(struct drm_device *dev)
 	if (ret < 0)
 		return ret;
 
-	dev->irq_enabled = true;
+	priv->irq_enabled = true;
 
 	return 0;
 }
@@ -300,10 +300,10 @@ void omap_drm_irq_uninstall(struct drm_device *dev)
 {
 	struct omap_drm_private *priv = dev->dev_private;
 
-	if (!dev->irq_enabled)
+	if (!priv->irq_enabled)
 		return;
 
-	dev->irq_enabled = false;
+	priv->irq_enabled = false;
 
 	dispc_free_irq(priv->dispc, dev);
 }