drm/exynos/hdmi: simplify clock re-parenting

Driver tries to disable sclk_hdmi during re-parenting, to avoid possible
glitches. It is ineffective as the clock is used also by other devices (mixer).
Anyway driver works without disabling sclk_hdmi.
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_hdmi.c

@@ -1569,9 +1569,7 @@ static void hdmi_mode_apply(struct hdmi_context *hdata)
 
 	hdmiphy_wait_for_pll(hdata);
 
-	clk_disable_unprepare(hdata->res.sclk_hdmi);
 	clk_set_parent(hdata->res.mout_hdmi, hdata->res.sclk_hdmiphy);
-	clk_prepare_enable(hdata->res.sclk_hdmi);
 
 	/* enable HDMI and timing generator */
 	hdmi_start(hdata, true);
@@ -1579,9 +1577,7 @@ static void hdmi_mode_apply(struct hdmi_context *hdata)
 
 static void hdmiphy_conf_reset(struct hdmi_context *hdata)
 {
-	clk_disable_unprepare(hdata->res.sclk_hdmi);
 	clk_set_parent(hdata->res.mout_hdmi, hdata->res.sclk_pixel);
-	clk_prepare_enable(hdata->res.sclk_hdmi);
 
 	/* reset hdmiphy */
 	hdmi_reg_writemask(hdata, HDMI_PHY_RSTOUT, ~0, HDMI_PHY_SW_RSTOUT);