drm/mediatek: dsi: provide LP-11 mode during .pre_enable

As per specification in drivers/gpu/drm/drm_bridge.c the data lanes
should be in LP-11 mode after .pre_enable() has been run. HS mode of the
data lanes are enabled with mtk_dsi_start(). Therefore, move that call
to the .enable() callback.

Signed-off-by: Michael Walle <mwalle@kernel.org>

Author: mwalle

drivers/gpu/drm/mediatek/mtk_dsi.c

@@ -738,8 +738,6 @@ static void mtk_output_dsi_enable(struct mtk_dsi *dsi)
 	mtk_dsi_set_mode(dsi);
 	mtk_dsi_clk_hs_mode(dsi, 1);
 
-	mtk_dsi_start(dsi);
-
 	dsi->enabled = true;
 }
 
@@ -786,7 +784,7 @@ static void mtk_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
 	if (dsi->refcount == 0)
 		return;
 
-	mtk_output_dsi_enable(dsi);
+	mtk_dsi_start(dsi);
 }
 
 static void mtk_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
@@ -798,6 +796,9 @@ static void mtk_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
 	ret = mtk_dsi_poweron(dsi);
 	if (ret < 0)
 		DRM_ERROR("failed to power on dsi\n");
+
+	/* Enter LP-11 state */
+	mtk_output_dsi_enable(dsi);
 }
 
 static void mtk_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,