linux-kernel - [PATCH v3 7/8] media: qcom: camss: csiphy-3ph: C-PHY needs own lane configuration

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Message-Id: <20260117-qcom-cphy-v3-7-8ce76a06f7db@ixit.cz>
Date: Sat, 17 Jan 2026 16:36:22 +0100
From: David Heidelberg via B4 Relay <devnull+david.ixit.cz@...nel.org>
To: Robert Foss <rfoss@...nel.org>, Todor Tomov <todor.too@...il.com>, 
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>, 
 Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Luca Weiss <luca.weiss@...rphone.com>, Petr Hodina <phodina@...tonmail.com>, 
 Casey Connolly <casey.connolly@...aro.org>, "Dr. Git" <drgitx@...il.com>
Cc: Konrad Dybcio <konrad.dybcio@....qualcomm.com>, 
 Joel Selvaraj <foss@...lselvaraj.com>, Kieran Bingham <kbingham@...nel.org>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, linux-media@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 phone-devel@...r.kernel.org, David Heidelberg <david@...t.cz>
Subject: [PATCH v3 7/8] media: qcom: camss: csiphy-3ph: C-PHY needs own
 lane configuration

From: David Heidelberg <david@...t.cz>

Catch when C-PHY configuration gets used on SoC with CAMSS missing C-PHY
configuration lane registers.

Hopefully this check will disappear as these lane regs gets populated.

Signed-off-by: David Heidelberg <david@...t.cz>
---
 drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
index d82a88dad74b5..89bfe3710fc3a 100644
--- a/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
+++ b/drivers/media/platform/qcom/camss/camss-csiphy-3ph-1-0.c
@@ -1217,6 +1217,22 @@ static int csiphy_lanes_enable(struct csiphy_device *csiphy,
 	u8 val;
 	int i;

+	if (c->phy_cfg == V4L2_MBUS_CSI2_CPHY) {
+		switch (csiphy->camss->res->version) {
+		case CAMSS_2290:
+		case CAMSS_8280XP:
+		case CAMSS_X1E80100:
+		case CAMSS_8550:
+		case CAMSS_8650:
+		case CAMSS_8300:
+		case CAMSS_8775P:
+			dev_err(dev, "Missing lane_regs definition for C-PHY\n");
+			return -EINVAL;
+		default:
+			break;
+		}
+	}
+
 	switch (csiphy->camss->res->version) {
 	case CAMSS_845:
 		if (c->phy_cfg == V4L2_MBUS_CSI2_CPHY) {

-- 
2.51.0