drm/exynos: Init the DSIM PHY in samsung_dsim_enable()

In case the PHY is not initialized, do it in samsung_dsim_enable(),
otherwise the link configuration registers are not programmed at all.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Jaehoon Chung <jh80.chung@samsung.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michael Tretter <m.tretter@pengutronix.de>
Cc: NXP Linux Team <linux-imx@nxp.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
To: dri-devel@lists.freedesktop.org

drivers/gpu/drm/bridge/samsung-dsim.c

@@ -1244,6 +1244,13 @@ static void samsung_dsim_enable(struct samsung_dsim *dsi)
 	pm_runtime_get_sync(dsi->dev);
 	dsi->state |= DSIM_STATE_ENABLED;
 
+	if (!(dsi->state & DSIM_STATE_INITIALIZED)) {
+		ret = samsung_dsim_init(dsi);
+		if (ret)
+			return;
+		dsi->state |= DSIM_STATE_INITIALIZED;
+	}
+
 	if (dsi->panel) {
 		ret = drm_panel_prepare(dsi->panel);
 		if (ret < 0)