[PATCH v6 11/11] phy: qualcomm: qmp-combo: Fix error propagation in qmp_combo_dp_power_on()

[Nabige Aala]

The configure_dp_phy() callback can return an error (e.g. -ETIMEDOUT on
PLL lock failure), but qmp_combo_dp_power_on() was ignoring the return
value and always returning 0.

Capture the return value, skip setting dp_powered_on on failure, and
propagate the error to the caller.

Fixes: dd1153651b038 ("phy: qcom-qmp-combo: merge driver data")
Signed-off-by: Ritesh Kumar <ritesh.kumar at oss.qualcomm.com>
Signed-off-by: Mahadevan P <mahadevan.p at oss.qualcomm.com>
Tested-by: Jeff Roach <jeff.roach0 at gmail.com> # HP OmniBook X 16 (Mahua)
Tested-by: Luke Macken <luke at phorex.org>
Signed-off-by: Nabige Aala <nabige.aala at oss.qualcomm.com>
---
 drivers/phy/qualcomm/phy-qcom-qmp-combo.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
index b34b892c2702..4def2bd991a8 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-combo.c
@@ -4416,8 +4416,9 @@ static int qmp_combo_dp_power_on(struct phy *phy)
 	const struct qmp_phy_cfg *cfg = qmp->cfg;
 	void __iomem *tx = qmp->dp_tx;
 	void __iomem *tx2 = qmp->dp_tx2;
+	int ret;
 
-	mutex_lock(&qmp->phy_mutex);
+	guard(mutex)(&qmp->phy_mutex);
 
 	qmp_combo_dp_serdes_init(qmp);
 
@@ -4428,12 +4429,14 @@ static int qmp_combo_dp_power_on(struct phy *phy)
 	cfg->configure_dp_tx(qmp);
 
 	/* Configure link rate, swing, etc. */
-	cfg->configure_dp_phy(qmp);
+	ret = cfg->configure_dp_phy(qmp);
+	if (ret) {
+		dev_err(qmp->dev, "DP PHY configuration failed: %d\n", ret);
+		return ret;
+	}
 
 	qmp->dp_powered_on = true;
 
-	mutex_unlock(&qmp->phy_mutex);
-
 	return 0;
 }
 

-- 
2.34.1