[RFC PATCH 05/11] drm/bridge: ti-sn65dsi86: Wrap panel with panel-bridge

[Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>]

To simplify interfacing with the panel, wrap it in a panel-bridge and
let the DRM bridge helpers handle chaining of operations.

This also prepares for support of DRM_BRIDGE_ATTACH_NO_CONNECTOR, which
requires all components in the display pipeline to be represented by
bridges.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/bridge/ti-sn65dsi86.c | 30 +++++++++++++++++++--------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index 1d1be791d5ba..c21a7f7d452b 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -124,6 +124,7 @@
  * @edid:         Detected EDID of eDP panel.
  * @refclk:       Our reference clock.
  * @panel:        Our panel.
+ * @next_bridge:  The next bridge.
  * @enable_gpio:  The GPIO we toggle to enable the bridge.
  * @supplies:     Data for bulk enabling/disabling our regulators.
  * @dp_lanes:     Count of dp_lanes we're using.
@@ -152,6 +153,7 @@ struct ti_sn_bridge {
 	struct mipi_dsi_device		*dsi;
 	struct clk			*refclk;
 	struct drm_panel		*panel;
+	struct drm_bridge		*next_bridge;
 	struct gpio_desc		*enable_gpio;
 	struct regulator_bulk_data	supplies[SN_REGULATOR_SUPPLY_NUM];
 	int				dp_lanes;
@@ -287,7 +289,7 @@ static int ti_sn_bridge_connector_get_modes(struct drm_connector *connector)
 		}
 	}
 
-	return drm_panel_get_modes(pdata->panel, connector);
+	return drm_bridge_get_modes(pdata->next_bridge, connector);
 }
 
 static enum drm_mode_status
@@ -418,8 +420,18 @@ static int ti_sn_bridge_attach(struct drm_bridge *bridge,
 	}
 	pdata->dsi = dsi;
 
+	/* Attach the next bridge */
+	ret = drm_bridge_attach(bridge->encoder, pdata->next_bridge,
+				&pdata->bridge, flags);
+	if (ret < 0) {
+		DRM_ERROR("failed to attach next bridge\n");
+		goto err_dsi_detach;
+	}
+
 	return 0;
 
+err_dsi_detach:
+	mipi_dsi_detach(dsi);
 err_dsi_attach:
 	mipi_dsi_device_unregister(dsi);
 err_dsi_host:
@@ -431,16 +443,12 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge)
 {
 	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
 
-	drm_panel_disable(pdata->panel);
-
 	/* disable video stream */
 	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE, 0);
 	/* semi auto link training mode OFF */
 	regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0);
 	/* disable DP PLL */
 	regmap_write(pdata->regmap, SN_PLL_ENABLE_REG, 0);
-
-	drm_panel_unprepare(pdata->panel);
 }
 
 static u32 ti_sn_bridge_get_dsi_freq(struct ti_sn_bridge *pdata)
@@ -819,8 +827,6 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge)
 	/* enable video stream */
 	regmap_update_bits(pdata->regmap, SN_ENH_FRAME_REG, VSTREAM_ENABLE,
 			   VSTREAM_ENABLE);
-
-	drm_panel_enable(pdata->panel);
 }
 
 static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge)
@@ -850,8 +856,6 @@ static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge)
 	 */
 	regmap_update_bits(pdata->regmap, SN_HPD_DISABLE_REG, HPD_DISABLE,
 			   HPD_DISABLE);
-
-	drm_panel_prepare(pdata->panel);
 }
 
 static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
@@ -1245,6 +1249,14 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
 		return ret;
 	}
 
+	pdata->next_bridge = devm_drm_panel_bridge_add(pdata->dev,
+						       pdata->panel);
+	if (IS_ERR(pdata->next_bridge)) {
+		DRM_ERROR("failed to create panel bridge\n");
+		ret = PTR_ERR(pdata->next_bridge);
+		return ret;
+	}
+
 	dev_set_drvdata(&client->dev, pdata);
 
 	pdata->enable_gpio = devm_gpiod_get_optional(pdata->dev, "enable",
-- 
Regards,

Laurent Pinchart