drm: Remove unnecessary drm_panel_attach and drm_panel_detach

These functions are now empty and no longer
useful so remove the functions and their uses.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Bernard Zhao <bernard@vivo.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>,
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Icenowy Zheng <icenowy@aosc.io>,
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: dri-devel@lists.freedesktop.org,
Cc: linux-kernel@vger.kernel.org
Cc: opensource.kernel@vivo.com
Signed-off-by: Sam Ravnborg <sam@ravnborg.org> # Fixed build and a few warnings
Link: https://patchwork.freedesktop.org/patch/msgid/9e13761020750b1ce2f1fabee23ef6e2a2942882.camel@perches.com

drivers/gpu/drm/exynos/exynos_drm_dpi.c

@@ -42,11 +42,6 @@ static inline struct exynos_dpi *encoder_to_dpi(struct drm_encoder *e)
 static enum drm_connector_status
 exynos_dpi_detect(struct drm_connector *connector, bool force)
 {
-	struct exynos_dpi *ctx = connector_to_dpi(connector);
-
-	if (ctx->panel)
-		drm_panel_attach(ctx->panel, &ctx->connector);
-
 	return connector_status_connected;
 }
 
@@ -249,8 +244,5 @@ int exynos_dpi_remove(struct drm_encoder *encoder)
 
 	exynos_dpi_disable(&ctx->encoder);
 
-	if (ctx->panel)
-		drm_panel_detach(ctx->panel);
-
 	return 0;
 }

drivers/gpu/drm/exynos/exynos_drm_dsi.c

@@ -1551,12 +1551,10 @@ static int exynos_dsi_host_attach(struct mipi_dsi_host *host,
 		}
 
 		dsi->panel = of_drm_find_panel(device->dev.of_node);
-		if (IS_ERR(dsi->panel)) {
+		if (IS_ERR(dsi->panel))
 			dsi->panel = NULL;
-		} else {
-			drm_panel_attach(dsi->panel, &dsi->connector);
+		else
 			dsi->connector.status = connector_status_connected;
-		}
 	}
 
 	/*
@@ -1596,7 +1594,6 @@ static int exynos_dsi_host_detach(struct mipi_dsi_host *host,
 	if (dsi->panel) {
 		mutex_lock(&drm->mode_config.mutex);
 		exynos_dsi_disable(&dsi->encoder);
-		drm_panel_detach(dsi->panel);
 		dsi->panel = NULL;
 		dsi->connector.status = connector_status_disconnected;
 		mutex_unlock(&drm->mode_config.mutex);