drm/omap: Store CRTC lookup by channel table in omap_drm_private

The omap_crtcs global array is used to store pointers to omap_crtc
indexed by DISPC channel number, in order to look them up in the dss_mgr
operations. Store the information in the omap_drm_private structure in
the form of an array of omap_drm_pipeline pointers.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_crtc.c

@@ -109,7 +109,6 @@ int omap_crtc_wait_pending(struct drm_crtc *crtc)
  */
 
 /* ovl-mgr-id -> crtc */
-static struct omap_crtc *omap_crtcs[8];
 static struct omap_dss_device *omap_crtc_output[8];
 
 /* we can probably ignore these until we support command-mode panels: */
@@ -215,7 +214,8 @@ static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
 static int omap_crtc_dss_enable(struct omap_drm_private *priv,
 				enum omap_channel channel)
 {
-	struct omap_crtc *omap_crtc = omap_crtcs[channel];
+	struct drm_crtc *crtc = priv->channels[channel]->crtc;
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 
 	priv->dispc_ops->mgr_set_timings(priv->dispc, omap_crtc->channel,
 					 &omap_crtc->vm);
@@ -227,7 +227,8 @@ static int omap_crtc_dss_enable(struct omap_drm_private *priv,
 static void omap_crtc_dss_disable(struct omap_drm_private *priv,
 				  enum omap_channel channel)
 {
-	struct omap_crtc *omap_crtc = omap_crtcs[channel];
+	struct drm_crtc *crtc = priv->channels[channel]->crtc;
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 
 	omap_crtc_set_enabled(&omap_crtc->base, false);
 }
@@ -236,7 +237,9 @@ static void omap_crtc_dss_set_timings(struct omap_drm_private *priv,
 		enum omap_channel channel,
 		const struct videomode *vm)
 {
-	struct omap_crtc *omap_crtc = omap_crtcs[channel];
+	struct drm_crtc *crtc = priv->channels[channel]->crtc;
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
+
 	DBG("%s", omap_crtc->name);
 	omap_crtc->vm = *vm;
 }
@@ -245,7 +248,8 @@ static void omap_crtc_dss_set_lcd_config(struct omap_drm_private *priv,
 		enum omap_channel channel,
 		const struct dss_lcd_mgr_config *config)
 {
-	struct omap_crtc *omap_crtc = omap_crtcs[channel];
+	struct drm_crtc *crtc = priv->channels[channel]->crtc;
+	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
 
 	DBG("%s", omap_crtc->name);
 	priv->dispc_ops->mgr_set_lcd_config(priv->dispc, omap_crtc->channel,
@@ -681,8 +685,6 @@ static const char *channel_names[] = {
 
 void omap_crtc_pre_init(struct omap_drm_private *priv)
 {
-	memset(omap_crtcs, 0, sizeof(omap_crtcs));
-
 	dss_install_mgr_ops(priv->dss, &mgr_ops, priv);
 }
 
@@ -706,10 +708,6 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 
 	DBG("%s", channel_names[channel]);
 
-	/* Multiple displays on same channel is not allowed */
-	if (WARN_ON(omap_crtcs[channel] != NULL))
-		return ERR_PTR(-EINVAL);
-
 	omap_crtc = kzalloc(sizeof(*omap_crtc), GFP_KERNEL);
 	if (!omap_crtc)
 		return ERR_PTR(-ENOMEM);
@@ -748,7 +746,5 @@ struct drm_crtc *omap_crtc_init(struct drm_device *dev,
 
 	omap_plane_install_properties(crtc->primary, &crtc->base);
 
-	omap_crtcs[channel] = omap_crtc;
-
 	return crtc;
 }

drivers/gpu/drm/omapdrm/omap_drv.c

@@ -167,6 +167,8 @@ static void omap_disconnect_pipelines(struct drm_device *ddev)
 		pipe->display = NULL;
 	}
 
+	memset(&priv->channels, 0, sizeof(priv->channels));
+
 	priv->num_pipes = 0;
 }
 
@@ -186,6 +188,7 @@ static int omap_connect_pipelines(struct drm_device *ddev)
 {
 	struct omap_drm_private *priv = ddev->dev_private;
 	struct omap_dss_device *output = NULL;
+	unsigned int i;
 	int r;
 
 	if (!omapdss_stack_is_ready())
@@ -218,6 +221,22 @@ static int omap_connect_pipelines(struct drm_device *ddev)
 	sort(priv->pipes, priv->num_pipes, sizeof(priv->pipes[0]),
 	     omap_compare_pipes, NULL);
 
+	/*
+	 * Populate the pipeline lookup table by DISPC channel. Only one display
+	 * is allowed per channel.
+	 */
+	for (i = 0; i < priv->num_pipes; ++i) {
+		struct omap_drm_pipeline *pipe = &priv->pipes[i];
+		enum omap_channel channel = pipe->output->dispc_channel;
+
+		if (WARN_ON(priv->channels[channel] != NULL)) {
+			r = -EINVAL;
+			goto cleanup;
+		}
+
+		priv->channels[channel] = pipe;
+	}
+
 	return 0;
 
 cleanup:

drivers/gpu/drm/omapdrm/omap_drv.h

@@ -64,6 +64,7 @@ struct omap_drm_private {
 
 	unsigned int num_pipes;
 	struct omap_drm_pipeline pipes[8];
+	struct omap_drm_pipeline *channels[8];
 
 	unsigned int num_planes;
 	struct drm_plane *planes[8];