linux-kernel - [REPOST PATCH v1 3/3] phy: qcom: Program SSC only if supported by sink

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Date:   Mon,  7 Feb 2022 16:17:04 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     quic_mkrishn@...cinc.com, linux-arm-msm@...r.kernel.org,
        Sankeerth Billakanti <quic_sbillaka@...cinc.com>,
        robdclark@...il.com, quic_khsieh@...cinc.com,
        quic_abhinavk@...cinc.com, linux-phy@...ts.infradead.org,
        Stephen Boyd <swboyd@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>, linux-kernel@...r.kernel.org
Subject: [REPOST PATCH v1 3/3] phy: qcom: Program SSC only if supported by sink

From: Sankeerth Billakanti <quic_sbillaka@...cinc.com>

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@...cinc.com>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/phy/qualcomm/phy-qcom-edp.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-edp.c b/drivers/phy/qualcomm/phy-qcom-edp.c
index 21cafbb623f8..cacd32f6e0cc 100644
--- a/drivers/phy/qualcomm/phy-qcom-edp.c
+++ b/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)
-- 
2.35.0.263.gb82422642f-goog