drm/bridge: ti-sn65dsi86: Move drm_panel_unprepare() to post_disable()

We prepared the panel in pre_enable() so we should unprepare it in
post_disable() to match.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210416153909.v4.5.Ia75c9ffe2a2582393a8532d244da86f18b4c9b21@changeid

drivers/gpu/drm/bridge/ti-sn65dsi86.c

@@ -452,8 +452,6 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge)
 	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)
@@ -869,6 +867,8 @@ static void ti_sn_bridge_post_disable(struct drm_bridge *bridge)
 {
 	struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
 
+	drm_panel_unprepare(pdata->panel);
+
 	clk_disable_unprepare(pdata->refclk);
 
 	pm_runtime_put_sync(pdata->dev);