drm/omap: dsi: request VC via mipi_dsi_attach

Drop custom request_vc/release_vc callbacks by using the
generic mipi_dsi_attach/mipi_dsi_detach functions.

To use mipi_dsi_attach() we need to fill in the mipi_dsi_device fields,
and some of these fields overlap with the fields in omap_dss_dsi_config.
In later patches the latter will get dropped.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-15-tomi.valkeinen@ti.com

drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c

@@ -693,14 +693,6 @@ static int dsicm_connect(struct omap_dss_device *src,
 			 struct omap_dss_device *dst)
 {
 	struct panel_drv_data *ddata = to_panel_data(dst);
-	struct device *dev = &ddata->dsi->dev;
-	int r;
-
-	r = src->ops->dsi.request_vc(src, ddata->channel);
-	if (r) {
-		dev_err(dev, "failed to get virtual channel\n");
-		return r;
-	}
 
 	ddata->src = src;
 	return 0;
@@ -711,7 +703,6 @@ static void dsicm_disconnect(struct omap_dss_device *src,
 {
 	struct panel_drv_data *ddata = to_panel_data(dst);
 
-	src->ops->dsi.release_vc(src, ddata->channel);
 	ddata->src = NULL;
 }
 
@@ -1276,8 +1267,21 @@ static int dsicm_probe(struct mipi_dsi_device *dsi)
 		goto err_bl;
 	}
 
+	dsi->lanes = 2;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS |
+			  MIPI_DSI_MODE_EOT_PACKET;
+	dsi->hs_rate = 300000000;
+	dsi->lp_rate = 10000000;
+
+	r = mipi_dsi_attach(dsi);
+	if (r < 0)
+		goto err_dsi_attach;
+
 	return 0;
 
+err_dsi_attach:
+	sysfs_remove_group(&dsi->dev.kobj, &dsicm_attr_group);
 err_bl:
 	destroy_workqueue(ddata->workqueue);
 err_reg:
@@ -1294,6 +1298,8 @@ static int __exit dsicm_remove(struct mipi_dsi_device *dsi)
 
 	dev_dbg(&dsi->dev, "remove\n");
 
+	mipi_dsi_detach(dsi);
+
 	omapdss_device_unregister(dssdev);
 
 	if (omapdss_device_is_enabled(dssdev))

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -349,7 +349,7 @@ struct dsi_data {
 
 	struct {
 		enum dsi_vc_source source;
-		struct omap_dss_device *dssdev;
+		struct mipi_dsi_device *dest;
 		enum fifo_size tx_fifo_size;
 		enum fifo_size rx_fifo_size;
 	} vc[4];
@@ -4689,32 +4689,6 @@ static enum omap_channel dsi_get_channel(struct dsi_data *dsi)
 	}
 }
 
-static int dsi_request_vc(struct omap_dss_device *dssdev, int channel)
-{
-	struct dsi_data *dsi = to_dsi_data(dssdev);
-
-	if (channel < 0 || channel > 3)
-		return -EINVAL;
-
-	if (dsi->vc[channel].dssdev) {
-		DSSERR("cannot get VC for display %s", dssdev->name);
-		return -EBUSY;
-	}
-
-	dsi->vc[channel].dssdev = dssdev;
-	return 0;
-}
-
-static void dsi_release_vc(struct omap_dss_device *dssdev, int channel)
-{
-	struct dsi_data *dsi = to_dsi_data(dssdev);
-
-	if ((channel >= 0 && channel <= 3) &&
-		dsi->vc[channel].dssdev == dssdev) {
-		dsi->vc[channel].dssdev = NULL;
-	}
-}
-
 static ssize_t omap_dsi_host_transfer(struct mipi_dsi_host *host,
 				      const struct mipi_dsi_msg *msg)
 {
@@ -4791,23 +4765,40 @@ static const struct omap_dss_device_ops dsi_ops = {
 		.update = dsi_update,
 
 		.enable_te = dsi_enable_te,
-
-		.request_vc = dsi_request_vc,
-		.release_vc = dsi_release_vc,
 	},
 };
 
 static int omap_dsi_host_attach(struct mipi_dsi_host *host,
-			 struct mipi_dsi_device *dsi)
+				struct mipi_dsi_device *client)
 {
-	/* TODO: convert driver from custom binding method to this one */
+	struct dsi_data *dsi = host_to_omap(host);
+	unsigned int channel = client->channel;
+
+	if (channel > 3)
+		return -EINVAL;
+
+	if (dsi->vc[channel].dest) {
+		DSSERR("cannot get VC for display %s", dev_name(&client->dev));
+		return -EBUSY;
+	}
+
+	dsi->vc[channel].dest = client;
 	return 0;
 }
 
 static int omap_dsi_host_detach(struct mipi_dsi_host *host,
-			 struct mipi_dsi_device *dsi)
+				struct mipi_dsi_device *client)
 {
-	/* TODO: convert driver from custom binding method to this one */
+	struct dsi_data *dsi = host_to_omap(host);
+	unsigned int channel = client->channel;
+
+	if (channel > 3)
+		return -EINVAL;
+
+	if (dsi->vc[channel].dest != client)
+		return -EINVAL;
+
+	dsi->vc[channel].dest = NULL;
 	return 0;
 }
 
@@ -5265,7 +5256,7 @@ static int dsi_probe(struct platform_device *pdev)
 	/* DSI VCs initialization */
 	for (i = 0; i < ARRAY_SIZE(dsi->vc); i++) {
 		dsi->vc[i].source = DSI_VC_SOURCE_L4;
-		dsi->vc[i].dssdev = NULL;
+		dsi->vc[i].dest = NULL;
 	}
 
 	r = dsi_get_clocks(dsi);

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -304,9 +304,6 @@ struct omapdss_dsi_ops {
 	int (*enable_video_output)(struct omap_dss_device *dssdev, int channel);
 	void (*disable_video_output)(struct omap_dss_device *dssdev,
 			int channel);
-
-	int (*request_vc)(struct omap_dss_device *dssdev, int channel);
-	void (*release_vc)(struct omap_dss_device *dssdev, int channel);
 };
 
 struct omap_dss_device_ops {