phy: qcom: Program SSC only if supported by sink

Some legacy eDP sinks may not support SSC. The support for SSC is
indicated through an opts flag from the controller driver. This
change will enable SSC only if the sink supports it.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@quicinc.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20220207161612.REPOST.v1.3.Ie81d594ec2327dae6410db359cc492484bab171f@changeid
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/qualcomm/phy-qcom-edp.c

@@ -335,9 +335,11 @@ static int qcom_edp_phy_power_on(struct phy *phy)
 	writel(0x00, edp->tx0 + TXn_LANE_MODE_1);
 	writel(0x00, edp->tx1 + TXn_LANE_MODE_1);
 
-	ret = qcom_edp_configure_ssc(edp);
-	if (ret)
-		return ret;
+	if (edp->dp_opts.ssc) {
+		ret = qcom_edp_configure_ssc(edp);
+		if (ret)
+			return ret;
+	}
 
 	ret = qcom_edp_configure_pll(edp);
 	if (ret)