drm/panel: himax-hx8394: Drop shutdown logic

The driver shutdown is duplicate as it calls drm_unprepare and
drm_disable which are called anyway when associated drivers are
shutdown/removed.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231204185719.569021-3-macroalpha82@gmail.comSigned-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231204185719.569021-3-macroalpha82@gmail.com

drivers/gpu/drm/panel/panel-himax-hx8394.c

@@ -390,27 +390,11 @@ static int hx8394_probe(struct mipi_dsi_device *dsi)
 	return 0;
 }
 
-static void hx8394_shutdown(struct mipi_dsi_device *dsi)
-{
-	struct hx8394 *ctx = mipi_dsi_get_drvdata(dsi);
-	int ret;
-
-	ret = drm_panel_disable(&ctx->panel);
-	if (ret < 0)
-		dev_err(&dsi->dev, "Failed to disable panel: %d\n", ret);
-
-	ret = drm_panel_unprepare(&ctx->panel);
-	if (ret < 0)
-		dev_err(&dsi->dev, "Failed to unprepare panel: %d\n", ret);
-}
-
 static void hx8394_remove(struct mipi_dsi_device *dsi)
 {
 	struct hx8394 *ctx = mipi_dsi_get_drvdata(dsi);
 	int ret;
 
-	hx8394_shutdown(dsi);
-
 	ret = mipi_dsi_detach(dsi);
 	if (ret < 0)
 		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
@@ -427,7 +411,6 @@ MODULE_DEVICE_TABLE(of, hx8394_of_match);
 static struct mipi_dsi_driver hx8394_driver = {
 	.probe	= hx8394_probe,
 	.remove = hx8394_remove,
-	.shutdown = hx8394_shutdown,
 	.driver = {
 		.name = DRV_NAME,
 		.of_match_table = hx8394_of_match,