drm/mediatek: dsi: Support dynamic connector selection

Add implementation of mtk_dsi_encoder_index to mtk_ddp_comp_func
to make mtk_dsi support dynamic connector selection.
Signed-off-by: Jason-JH.Lin <jason-jh.lin@mediatek.com>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Reviewed-by: Fei Shao <fshao@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Fei Shao <fshao@chromium.org>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20231004024013.18956-9-jason-jh.lin@mediatek.com/Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_disp_drv.h

@@ -48,6 +48,7 @@ unsigned int mtk_dpi_encoder_index(struct device *dev);
 
 void mtk_dsi_ddp_start(struct device *dev);
 void mtk_dsi_ddp_stop(struct device *dev);
+unsigned int mtk_dsi_encoder_index(struct device *dev);
 
 int mtk_gamma_clk_enable(struct device *dev);
 void mtk_gamma_clk_disable(struct device *dev);

drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c

@@ -318,6 +318,7 @@ static const struct mtk_ddp_comp_funcs ddp_dsc = {
 static const struct mtk_ddp_comp_funcs ddp_dsi = {
 	.start = mtk_dsi_ddp_start,
 	.stop = mtk_dsi_ddp_stop,
+	.encoder_index = mtk_dsi_encoder_index,
 };
 
 static const struct mtk_ddp_comp_funcs ddp_gamma = {

drivers/gpu/drm/mediatek/mtk_dsi.c

@@ -887,6 +887,15 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi)
 	return ret;
 }
 
+unsigned int mtk_dsi_encoder_index(struct device *dev)
+{
+	struct mtk_dsi *dsi = dev_get_drvdata(dev);
+	unsigned int encoder_index = drm_encoder_index(&dsi->encoder);
+
+	dev_dbg(dev, "encoder index:%d\n", encoder_index);
+	return encoder_index;
+}
+
 static int mtk_dsi_bind(struct device *dev, struct device *master, void *data)
 {
 	int ret;